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QUESTION 31
ACME Rocket Sleds is growing, and so is their network. They have determined that they can no longer continue using static routes and must implement
a dynamic routing protocol. They want to have data use multiple paths to the destinations, even if the paths are not equal cost.
Which routing protocol has the ability to do this?
A. EIGRP
B. OSPF
C. RIPv1
D. RIPv2
E. BGP
F. IS-IS
Correct Answer: A Explanation
Explanation/Reference:
Explanation: Unlike most internal routing protocols, EIGRP has a really cool feature that allows you to share the load of your traffic across multiple links and not just links that have the same cost values. EIGRP allows you to make full use of your redundant links that could be in place just to have for back up but you are paying out a lot of money just to sit there and do nothing. EIGRP makes it easy for us the network engineers to make this happen. Before jumping in the in’s and out lets run through a few things first when it comes to EIGRP Load Sharing, also refereed to as Load Balancing sometimes.
QUESTION 32
Refer to the exhibit.
ROUTE Enterprises has many stub networks in their enterprise network, such as router B and its associated network. EIGRP is to be implemented on router A so that neither the prefix for the S/0/0/0 interface nor the prefixes from router B appear in the routing tables for the router in the enterprise network. Which action will accomplish this goal?
A. Declare router B a stub router using the eigrp stub command.
B. Use the passive-interface command for interface Serial0/0/0.
C. Use a mask with the network command to exclude interface Serial0/0/0.
D. Implement a distribute list to exclude the link prefix from the routing updates.
Correct Answer: C Explanation
Explanation/Reference:
Explanation
If we declare router B a stub router then the routers in Enterprise Network still learn about the network for S0/0/0 interface and the network behind router
B.
If we use the passive-interface command on s0/0/0 interface then router A & B can not become neighbors because they don’t exchange hello messages -> A can not send traffic to the network behind B .
Theoretically, we can use a distribute list to exclude both the link prefix and the prefix from router B but it is not efficient because:
+ We have many stub networks so we will need a “long” distribute list. + We declare networks in stub routers (like router B) while filter them out at router A -> it is a waste.
Not totally sure about answer C because if we “use a mask with the network command to exclude interface Serial0/0/0 then router A and B can not become neighbors and the situation is same as answer B. But from many discussions about this question, maybe C is the best answer.
QUESTION 33
Refer to the exhibit.
Which statement about dynamic routing protocols for this network is true?
A. No dynamic interior routing protocol can summarize as shown.
B. Unless configured otherwise, EIGRP would automatically summarize the prefixes as shown in the exhibit.
C. With this IP addressing scheme, EIGRP can be manually configured to summarize prefixes at the specified summarization points.
D. The IP address design lends itself to OSPF. Each summarizing router would be an ABR, summarizing to the next area in the address hierarchy.
Correct Answer: C Explanation
Explanation/Reference:
Explanation:
Summarization may be manually applied at any point in the network. You can configure manual summarization on any router interface. Consider summarization for both upstream and downstream neighbors. Upstream neighbors should receive a consolidated route, and downstream neighbors can receive a default route.
QUESTION 34
After implementing EIGRP on your network, you issue the show ip eigrp traffic command on router C. The following output is shown:
RouterC#show ip eigrp traffic IF-EIGRP Traffic Statistics for process 1 Hellos sent/received: 481/444 Updates sent/received: 41/32 Queries sent/received: 5/1 Replies sent/received: 1/4 Acks sent/received: 21/25 Input queue high water mark 2, 0 drops SIA-Queries sent/received: 0/0 SIA-Replies sent/received: 0/0
Approximately 25 minutes later, you issue the same command again. The following output is shown:
RouterC#show ip eigrp traffic IP-EIGRP Traffic Statistics for process 1 Hellos sent/received: 1057/1020 Updates sent/received: 41/32 Queries sent/received: 5/1 Replies sent/received: 1/4 Acks sent/received: 21/25 Input queue high water mark 2, 0 drops SIA-Queries sent/received: 0/0 SIA-Replies sent/received: 0/0
Approximately 25 minutes later, you issue the same command a third time. The following output is shown: RouterC#show ip eigrp traffic IP-EIGRP Traffic Statistics for process 1 Hellos sent/received: 1754/1717 Updates sent/received: 41/32 Queries sent/received: 5/1 Replies sent/received: 1/4 Acks sent/received: 21/25 Input queue high water mark 2, 0 drops SIA-Queries sent/received: 0/0 SIA-Replies sent/received: 0/0
What can you conclude about this network?
A. The network has been stable for at least the last 45 minutes.
B. There is a flapping link or interface, and router C knows an alternate path to the network.
C. There is a flapping link or interface, and router A does not know an alternate path to the network.
D. EIGRP is not working correctly on router C.
E. There is not enough information to make a determination.
Correct Answer: A Explanation
Explanation/Reference:
Explanation
In three times using the command, the “Queries sent/received” & “Replies sent/received” are still the same -> the network is stable.
QUESTION 35
After implementing EIGRP on your network, you issue the show ip eigrp traffic command on router C. The following output is shown:
RouterC#show ip eigrp traffic IP-EIGRP Traffic Statistics for process 1 Hellos sent/received: 2112/2076 Updates sent/received: 47/38 Queries sent/received: 5/3 Replies sent/received: 3/4 Acks sent/received: 29/33 Input queue high water mark 2, 0 drops SIA-Queries sent/received: 0/0 SIA-Replies sent/received: 0/0
Moments later, you issue the same command a second time and the following output is shown:
RouterC#show ip eigrp traffic IP-EIGRP Traffic Statistics for process 1 Hellos sent/received: 2139/2104 Updates sent/received: 50/39 Queries sent/received: 5/4 Replies sent/received: 4/4 Acks sent/received: 31/37 Input queue high water mark 2, 0 drops SIA-Queries sent/received: 0/0 SIA-Replies sent/received: 0/0
Moments later, you issue the same command a third time and the following output is shown:
RouterC#show ip eigrp traffic IP-EIGRP Traffic Statistics for process 1 Hellos sent/received: 2162/2126 Updates sent/received: 53/42 Queries sent/received: 5/5 Replies sent/received: 5/4 Acks sent/received: 35/41 Input queue high water mark 2, 0 drops SIA-Queries sent/received: 0/0 SIA-Replies sent/received: 0/0
What information can you determine about this network?
A. The network is stable.
B. There is a flapping link or interface, and router C knows an alternate path to the network.
C. There is a flapping link or interface, and router C does not know an alternate path to the network.
D. EIGRP is not working correctly on router C.
E. There is not enough information to make a determination.
Correct Answer: B Explanation
Explanation/Reference:
Explanation We notice that the “Queries received” number is increased so router C has been asked for a route. The “Replies sent” number is also increased -> router C knows an alternate path to the network.
QUESTION 36
Refer to the exhibit.
EIGRP has been configured on router D. Router C is performing mutual redistribution between EIGRP and OSPF. While verifying that the redistribution is functioning properly, you discover that while router C has all of the EIGRP routes in its routing table, router A does not have any routes from the EIGRP domain. What on router C may be the cause of the problem?
A. The no auto-summary command needs to be added under router eigrp 1.
B. The subnets keyword was not included in the redistribute command under router ospf 1.
C. The metric specified for the redistributed EIGRP routes is too large; making the EIGRP routes unreachable by router A.
D. The default-information originate command needs to be added under router ospf 1.
E. The administrative distance of either OSPF or EIGRP must be changed so that EIGRP has a higher administrative distance than OSPF.
Correct Answer: B Explanation
Explanation/Reference:
Explanation
If we don’t use the “subnets” keyword when redistributing routes learned from another routing process into OSPF, only classful routes will be redistributed. This is an important thing to remember when redistributing into OSPF.
QUESTION 37
During the redistribution process configured on RTA, some of the EIGRP routes, such as 10.1.1.0/24 and 10.2.2.0/24, are not being redistributed into the OSPF routing domain.
Which two items could be a solution to this problem? (Choose two.)
A. Change the metric-type to 2 in the redistribute command.
B. Configure the redistribute command under router eigrp 1 instead.
C. Change the EIGRP AS number from 100 to 1 in the redistribute command.
D. Add the subnets option to the redistribute command.
E. Change the metric to an EIGRP compatible metric value (bandwidth, delay, reliability, load, MTUs) in the redistribute command.
Correct Answer: CD Explanation
Explanation/Reference:
Explanation:
In this example, the router is configured for EIGRP AS 1, but EIGRP AS 100 is being redistributed into OSPF so the EIGRP AS needs to be changed
from 100 to 1. The subnets keyword tells OSPF to redistribute all subnet routes. Without the subnets keyword, only networks that are not subnetted are
redistributed by OSPF.
Example:
RTA(config)#router ospf 109
RTA(config-router)#redistribute rip subnets
RTA(config-router)#network 130.10.62.0 0.0.0.255 area 0 RTA(config-router)#network 130.10.63.0 0.0.0.255 area 0 The subnets keyword tells OSPF to
redistribute all subnet routes. Without the subnets keyword, only networks that are not subnetted are redistributed by OSPF.
QUESTION 38
Given the accompanying output, which additional command is needed to redistribute IGRP into EIGRP?
Router eigrp 123 Network 10.10.10.0 No auto-summary ! Router igrp 123 Network 172.16.0.0 Network 172.17.0.0
A. Under the router igrp mode add redistribute eigrp 123
B. Under the router eigrp mode add redistribute igrp 123
C. Under the router eigrp mode add redistribute igrp 123 subnets
D. None, EIGRP and IGRP are automatically redistributed in this instance.
Correct Answer: D Explanation
Explanation/Reference:
Explanation:
The point of this question is redistribute IGRP into EIGRP. When redistributing IGRP into EIGRP, there is a feature that they are automatically
redistributed if they have same autonomous system number; in opposite, they need to manually redistributed if they have different autonomous system
number..
QUESTION 39
Which command will display EIGRP packets sent and received, as well as statistics on hello packets, updates, queries, replies, and acknowledgments?
A. debug eigrp packets
B. show ip eigrp traffic
C. debug ip eigrp
D. show ip eigrp interfaces
Correct Answer: B Explanation
Explanation/Reference:
Explanation:
The show ip eigrp traffic command displays the number of Enhanced IGRP (EIGRP) packets sent and received.
Example:
The following is sample output from the show ip eigrp traffic command.
Router# show ip eigrp traffic
IP-EIGRP Traffic Statistics for process 77
Hellos sent/received. 218/205
Updates sent/received. 7/23
Queries sent/received. 2/0
Replies sent/received. 0/2
Acks sent/received. 21/14
QUESTION 40
Which three statements are true about EIGRP operation? (Choose three.)
A. When summarization is configured, the router will also create a route to null 0.
B. The summary route remains in the route table, even if there are no more specific routes to the network.
C. Summarization is configured on a per-interface level.
D. The maximum metric for the specific routes is used as the metric for the summary route.
E. Automatic summarization across major network boundaries is enabled by default.
Correct Answer: ACE Explanation
Explanation/Reference:
QUESTION 41
Which two statements about the EIGRP DUAL process are correct? (Choose two.)
A. An EIGRP route will go active if there are no successors or feasible successors in the EIGRP topology table.
B. An EIGRP route will go passive if there are no successors in the EIGRP topology table.
C. DUAL will trigger an EIGRP query process while placing the flapping routes in the holddown state.
D. A feasible successor in the EIGRP topology table can become the successor only after all the query requests have been replied to.
E. The stuck in active state is caused when the wait for the query replies have timed out.
F. EIGRP queries are sent during the loading state in the EIGRP neighbor establishment process.
Correct Answer: AE Explanation
Explanation/Reference:
QUESTION 42
What are three key concepts that apply when configuring the EIGRP stub routing feature in a hub and spoke network? (Choose three.)
A. A hub router prevents routes from being advertised to the remote router.
B. Only remote routers are configured as stubs.
C. Stub routers are not queried for routes.
D. Spoke routers connected to hub routers answer the route queries for the stub router.
E. A stub router should have only EIGRP hub routers as neighbors.
F. EIGRP stub routing should be used on hub routers only.
Correct Answer: BCE Explanation
Explanation/Reference:
QUESTION 43
Refer to the exhibit. EIGRP is configured with the default configuration on all routers. Autosummarization is enabled on routers R2 and R3, but it is disabled on router R1. Which two EIGRP routes will be seen in the routing table of router R3? (Choose two.)
A. 10.0.0.0/8
B. 10.10.0.0/16
C. 10.10.10.0/24
D. 172.16.0.0/16
E. 172.16.0.0/24
F. 172.16.10.0/24
Correct Answer: CD Explanation Explanation/Reference:
Explanation
EIGRP performs an auto-summarization each time it crosses a border between two different major networks. In this case all different networks are in different major networks so EIGRP will perform auto-summarization when it exits an interface. But R1 has been configured with “no auto-summary” command so EIGRP will not summarize on S0 interface of R1. So the routing table of R2 will have the network 10.10.10.0/24 (not be summarized).
When exiting S1 interface of R2, EIGRP summarizes network 172.16.10.0/24 into the major 172.16.0.0/16 network but it does not summarize network 10.10.10.0/24 because it is not directly connected with this network. Therefore in the routing table of R3 there will have:
+
Network 10.10.10.0/24 ( not summarized)
+
Network 172.16.0.0/16 (summarized)
-> C and D are correct.
Note: I simulated this question on GNS3, you can see the final outputs of the “show ip route” commands on these routers (I connected these routers via
FastEthernet, not Serial interfaces so the outputs are slightly different but the main points are not changed).
QUESTION 44
Refer to the exhibit and the partial configuration on router R2. On router R4 all RIP routes are redistributed into the OSPF domain. A second redistribution is configured on router R2 using a route map. Based on the configuration on router R2, which EIGRP external routes will be present in the routing table of R1?
A. the routes originating from the RIP routing domain
B. the routes originating from the OSPF stub area
C. all OSPF inter and intra-area routes
D. all routes originating from RIP and OSPF routing domains
Correct Answer: A Explanation
Explanation/Reference:
Explanation R2 sees the routes from RIP domain as external routes while it sees the routes from OSPF Stub Area as internal routers. From the output we learn that the “route-type external” is redistributed from OSPF to EIGRP (via route-map ABC) so we will see the routes from the RIP domain (external) in the routing table of R1.
In the case we want to redistribute routes from OSPF Stub Area (Area 1) to EIGRP we need to use the “match route-type internal” command instead.
QUESTION 45
Refer to the exhibit. EIGRP has been configured on routers R1 and R2. However, R1 does not show R2 as a neighbor and does not accept routing updates from R2. What could be the cause of the problem?
A. The no auto-summary command has not been issued under the EIGRP process on both routers.
B. Interface E0 on router R1 has not been configured with a secondary IP address of 10.1.2.1/24.
C. EIGRP cannot exchange routing updates with a neighbor’s router interface that is configured with two IP addresses.
D. EIGRP cannot form neighbor relationship and exchange routing updates with a secondary address.
Correct Answer: D Explanation
Explanation/Reference:
Explanation
EIGRP updates always use the primary IP address of the outgoing interface as the source address. In this case R2 will use the 10.1.2.2/24 address, which is not in the same subnet of R1, to send EIGRP update to R1. Therefore R1 does not accept this update and generates the “not on common subnet” error message.
Answer D is a bit unclear. It should state that “EIGRP cannot form neighbor relationship and exchange routing updates if the two primary addresses on two routers are not in the same subnet”.
Notice that although R1 does not accept R2 as its EIGRP neighbors but R2 accepts R1 as its EIGRP neighbor accepts R1 hello packets.. For more information about this problem, please read
QUESTION 46
Refer to the exhibit.
EIGRP had converged in AS 1 when the link between router R1 and R2 went down. The console on router R2 generated the following messages:
*Mar 20 12:12:06: %DUAL-5-NBRCHANGE. IP-EIGRP 1: Neighbor 10.1.4.3 (Serial0) is down: stuck in active
*Mar 20 12:15:23: %DUAL-3-SIA. Route 10.1.1.0/24 stuck-in-active state in IP-EIGRP 1. Cleaning up The network administrator issued the show ip
eigrp topology active command on R2 to check the status of the EIGRP network. Which statement best describes the reason for the error messages?
A. Incorrect bandwidth configuration on router R3 prevents R2 from establishing neighbor adjacency.
B. Incorrect bandwidth configuration on router R5 prevents R2 from establishing neighbor adjacency.
C. Router R3 did not reply to the query about network 10.1.1.0/24 sent by router R2 .
D. Router R5 did not reply to the query about network 10.1.1.0/24 sent by router R2 .
Correct Answer: C Explanation
Explanation/Reference:
Explanation
When the link between R1 and R2 is down, R2 loses its successor for the network 10.1.1.0/24. R2 checks its topology table for a feasible successor but it can’t find one. So R2 goes active on the that route to find a new successor by sending queries out to its neighbors (R3 and R5) requesting a path to the lost route. Both R3 and R5 also go “active” for the that route. But R5 doesn’t have any neighbor to ask besides R2 so it will send an “unreachable message” to indicate it has no alternative path for that route and has no other neighbor to query. R3 also checks its EIRGP topology table for a feasible successor but it has none, too. Unlike R5, R3 has a neighbor (R4) so it continues to query this router.
Now suppose there is a problem on the link between R3 and R4 so R4 never receives the query from R3 and of course, R3 also never receives a reply back from R4. Therefore, R3 can’t reply back to R2. After about 3 minutes, the “Stuck in active” (SIA) timer on R2 expires and R2 marks the route 10.1.1.0/24 as “stuck in active” route.
The output line “via 10.1.3.3 (Infinity/Infinity), r, Seiral0, serno 1232 indicates R2 has sent a query to 10.1.3.3 and is waiting for a reply (the lowercase r).
QUESTION 47
Which EIGRP packet statement is true?
A. On high-speed links, hello packets are broadcast every 5 seconds for neighbor discovery.
B. On low-speed links, hello packets are broadcast every 15 seconds for neighbor discovery.
C. Reply packets are multicast to IP address 224.0.0.10 using RTP.
D. Update packets route reliable change information only to the affected routers.
E. Reply packets are used to send routing updates.
Correct Answer: D Explanation
Explanation/Reference:
Reference:
QUESTION 48
Refer to the exhibit. EIGRP has been configured on all routers in the network. The command metric weights 0 0 1 0 0 has been added to the EIGRP process so that only the delay metric is used in the path calculations. Which router will R1 select as the successor and feasible successor for Network A?
A. R4 becomes the successor for Network A and will be placed in the routing table. R2 becomes the feasible successor for Network A.
B. R4 becomes the successor for Network A and will be included in the routing table. No feasible successor will be selected as the advertised distance from R2 is higher than the feasible distance.
C. R2 becomes the successor and will be placed in the routing table. R4 becomes the feasible successor for Network A.
D. R2 becomes the successor and will be placed in the routing table. No feasible successor will be selected as the reported distance from R4 is lower than the feasible distance.
Correct Answer: B Explanation
Explanation/Reference:
Explanation: The point of the question is DUAL of EIGRP. FD=5+10+5=20 R4 is successor No FS, because no other router’s AD is lower the FD
QUESTION 49
During a redistribution of routes from OSPF into EIGRP, an administrator notices that none of the OSPF routes are showing in EIGRP. What are two possible causes? (Choose two.)
A. incorrect distribute lists have been configured
B. missing ip classless command
C. CEF not enabled
D. no default metric configured for EIGRP
Correct Answer: AD Explanation
Explanation/Reference:
Explanation
An incorrect distribute list can filter out updates therefore none of the OSPF routes are showing in EIGRP.
The default metric when redistributing into EIGRP is infinite so we must specify a seed metric for EIGRP to work with.
QUESTION 50
You are a network technician, study the exhibit carefully.
What must be done on router A in order to make EIGRP work effectively in a Frame Relay multipoint environment?
A. Issue the command bandwidth 56 on the physical interface.
B. Issue the command bandwidth 56 on each subinterface.
C. Issue the command bandwidth 224 on each subinterface.
D. Issue the command bandwidth 224 on the physical interface.
Correct Answer: D Explanation Explanation/Reference:
Explanation
In Frame Relay, all neighbors share the same bandwidth, regardless of the actual CIR of each individual PVC. In this case the CIR of each PVC is the
same so we can find the bandwidth of the main interface (multipoint connection interface) by 56 x 4 = 224.
Notice that if the bandwidth on each PVC is not equal then we get the lowest bandwidth to multiply.
QUESTION 51
Based on the exhibited output, which three statements are true? (Choose three.)
A. R1 is configured with the variance command.
B. The route to 10.2.0.0/16 was redistributed into EIGRP.
C. A default route has been redistributed into the EIGRP autonomous system.
D. R1 is configured with the ip summary-address command.
E. The router at 10.1.1.2 is configured with the ip default-network 0.0.0.0 command.
F. R1 is sourcing an external EIGRP route from Null0.
Correct Answer: ACD Explanation Explanation/Reference:
Explanation
From the routing table above, we see that network 172.16.1. can be reached via 2 unequal paths (with FD of 23072000 & 20640000) so surely R1 has been configured with the “variance” command By configuring a default route and redistribute it into EIGRP you will get the line “D *EX 0.0.0.0/0 …” line in the routing table of that router From the line “10.2.0.0/16 is a summary, 00:16:18, Null0 we know that this network has been summarized with the “ip summaray-address” command
(notice that 10.2.0.0 is not the major network of net
QUESTION 52
Examine the exhibit carefully.
EIGRP is configured on all routers in the network. What conclusion can be derived from the show ip eigrp topology output provided?
A. Router R1 is waiting for a reply from the neighbor 10.1.2.1 to the hello message sent out inquiring for a second successor to network 10.6.1.0/24.
B. Router R1 can send traffic destined for network 10.6.1.0/24 out of interface FastEthernet0/0.
C. Router R1 is waiting for a reply from the neighbor 10.1.2.1 to the hello message sent out before it declares the neighbor unreachable.
D. Router R1 is waiting for a reply from the neighbor 10.1.2.1 in response to the query sent out about network 10.6.1.0/24.
Correct Answer: D Explanation
Explanation/Reference:
Explanation:
The “show ip eigrp topology” command lists all routes that EIGRP is aware of and shows whether EIGRP is actively processing information on that route.
Under most normal conditions, the routes should all be in a passive state and no EIGRP process are running for that route. If the routes are active, this
could indicate the dreaded stuck in active, or SIA, state.
The fields to note in this output are as follows:
P–Passive; no EIGRP computation is being performed. This is the ideal state. A–Active; EIGRP computations are “actively” being performed for this
destination. Routes constantly appearing in an active state indicate a neighbor or query problem.
Both are symptoms of the SIA problem.
U– Update; an update packet was sent to this destination. Q–Query; a query packet was sent to this destination. R– Reply; a reply packet was sent to
this destination. Route information– IP address of the route or network, its subnet mask, and the successor, or next hop to that network, or the feasible
successor.
QUESTION 53
Which three statements are true about EIGRP route summarization? (Choose three.)
A. Manual route summarization is configured in router configuration mode when the router is configured for EIGRP routing.
B. Manual route summarization is configured on the interface.
C. When manual summarization is configured, the summary route will use the metric of the largest specific metric of the summary routes.
D. The ip summary-address eigrp command generates a default route with an administrative distance of 90.
E. The ip summary-address eigrp command generates a default route with an administrative distance of 5.
F. When manual summarization is configured, the router immediately creates a route that points to null0 interface.
Correct Answer: BEF Explanation
Explanation/Reference:
Explanation: The purpose of route summarization is small routing tables, smaller updates. On major network boundaries, subnetworks are summarized to a single classful network and automatic route summarization is enabled by default. Manual route summarization can be configured on per interface basis. When summarization is configured on an interface, the router immediately creates a route pointing to null0. Route summarization works in conjunction with the ip summary-address eigrp interface configuration command, in which additional summarization can be performed. If automatic summarization is in effect, there usually is no need to configure network level summaries using the ip summary-address eigrp command. You can configure a summary aggregate address for a specified interface. If there are any more specific routes in the routing table, EIGRP will advertise the summary address out the interface with a metric equal to the minimum of all more specific routes
QUESTION 54
Refer to the exhibit.
A. All outgoing routing updates from router R1 to router R2 will be suppressed, but the inbound updates will continue to be received.
B. All incoming routing updates from R2 will be suppressed, but the outgoing updates will continue to be sent.
C. Both outgoing and incoming routing updates on R1 will be stopped because of the passive-interface Serial0/0 configuration statement.
D. Both outgoing and incoming routing updates on R1 will be permitted because the distribute-list 20 out Serial0/0 command cannot be used with association with the outgoing interface.
Correct Answer: C Explanation
Explanation/Reference:
Explanation: You can use the passive-interface command to control the advertisement of routing information. The command enables the suppression of routing updates over some interfaces while it allows updates to be exchanged normally over other interfaces. With most routing protocols, the passive-interface command restricts outgoing advertisements only. However, when used with Enhanced Interior Gateway Routing Protocol (EIGRP), the effect is slightly different. With EIGRP running on a network, the passive-interface command stops both outgoing and incoming routing updates, since the effect of the command causes the router to stop sending and receiving hello packets over an interface. Reference:
QUESTION 55
What does the default value of the EIGRP variance command of 1 mean?
A. Load balancing is disabled on this router.
B. The router performs equal-cost load balancing.
C. Only the path that is the feasible successor should be used.
D. The router only performs equal-cost load balancing on all paths that have a metric greater than 1.
Correct Answer: B Explanation
Explanation/Reference:
Explanations
The point of the question is about the balance configuration of EIGRP. If variance is 1, it means that it support Equal cost path.
QUESTION 56
Refer to the exhibit.
R1 and R2 have been configured to share routing information via EIGRP. What will be the result of the configuration section shown for R2?
A. Any routes learned by R2 from the interface tied to the 172.16.0.0 network will not be advertised to neighbors on the 192.168.2.0 network.
B. Only routes learned by R2 from the interface tied to the 172.16.0.0 network will be advertised to neighbors on the 192.168.2.0 network.
C. Only the 172.16.0.0 network will be advertised to neighbors on the 192.168.2.0 network.
D. All networks, except the 172.16.0.0 network will be advertised to neighbors on the 192.168.2.0 network.
Correct Answer: C Explanation Explanation/Reference:
QUESTION 57
Refer to the exhibit.
Which two statements are true? (Choose two.)
A. The eigrp stub command prevents queries from being sent from R2 to R1.
B. The eigrp stub command will automatically enable summarization of routes on R2.
C. The eigrp stub command prevents all routes except a default route from being advertised to R1.
D. Router R1 will advertise connected and summary routes only.
E. Router R1 will advertise connected and static routes. The sending of summary routes will not be permitted.
F. Router R1 is configured as a receive-only neighbor and will not send any connected, static or summary routes.
Correct Answer: AD Explanation
Explanation/Reference:
Explanation
The command “eigrp stub” turns R1 into a stub router so R2 will never send any query to R1 because R2 knows that a stub router will only route packets for networks it has explicitly advertised.
The command “eigrp stub” is same as “eigrp stub connected summary” command because connected and summarized routes are advertised by default.
Note: Because the network 192.168.50.0 is not advertised by “network” statement, it is necessary to redistribute connected route with the “redistribute connected” command.
QUESTION 58
Refer to the exhibit.
The routing protocols EIGRP and OSPF have been configured as indicated in the exhibit. Given the partial configuration of router R2, which network will be present in the routing table of R4?
A. Network A
B. Network B
C. Network A and Network B
D. neither Network A nor Network B
Correct Answer: B Explanation
Explanation/Reference:
Explanation:
In this exhibit the OSPF domain is redistributed into the EIGRP 100 domain so Network B will present into Router R-4. However, the Network A network
will not be seen on router R-4 (The bottom router which is improperly labeled Network B) because EIGRP 50 was not redistributed into EIGRP 100.
QUESTION 59
When an EIGRP topology change is detected, what is the correct order of events when there is a FS?
A. The neighbor adjacency is deleted. The feasible route is used. DUAL is notified. Remove all topology entries learned from that neighbor.
B. DUAL is notified. Remove all topology entries learned from that neighbor. The neighbor adjacency is deleted. Routes enter the Active state and the feasible route is used.
C. The neighbor adjacency is deleted. Routes enter the Active state and the feasible route is used. DUAL is notified. Remove all topology entries learned from that neighbor.
D. DUAL is notified. The neighbor adjacency is deleted. Remove all topology entries learned from that neighbor. The feasible route is used.
Correct Answer: D Explanation
Explanation/Reference:
Explanation: If a packet is not received before the expiration of the hold time, the neighbor adjacency is deleted, and all topology table entries learned from that neighbor are removed, as if the neighbor had sent an update stating that all the routes are unreachable. If the neighbor is a successor for any destination networks, those networks are removed from the routing table, and alternative paths, if available, are computed. This lets the routes quickly reconverge if an alternative feasible route is available.
QUESTION 60
Refer to the exhibit. The network administrator is trying to configure mutual redistribution between EIGRP and OSPF. Autosummarization in EIGRP 100 AS is disabled. After adding OSPF configuration to router B1, the network administrator checked the routing table of router B2, but none of the EIGRP routes appeared there. To redistribute the EIGRP AS 100 routes into OSPF, which command should be added, or edited, on router B1 under router ospf 10?
A. redistribute eigrp 100 metric-type 1
B. redistribute eigrp 100 subnets
C. no auto-summary 10.0.0.0 255.0.0.0
D. area 0 range 10.10.0.0 255.255.0.0
Correct Answer: B Explanation Explanation/Reference:
Explanation
When redistributing into OSPF without keyword “subnets”, only classful networks will be redistributed. Classful networks here mean networks with the default major subnet masks (for example 10.0.0.0/8; 180.1.0.0/16; 200.200.200.0/24…). In fact, the routing table on the exhibit above is not totally correct. The network 192.168.110.0/24 will be redistributed and shown in the routing table of
B2 even if the keyword “subnets” is not used because it belongs to class C with the default subnet mask of class C.
To make all the networks, including subnets appear in the routing table of B2 we must use keyword “subnets” when redistributing into OSPF. This is also
an important thing to remember when redistributing into OSPF.
QUESTION 61
Which of the following are methods EIGRP uses to initially populate (seed) its EIGRP topology table, before learning topology data from neighbors? (Choose two.)
A. By adding all subnets listed by the show ip route connected command
B. By adding the subnets of working interfaces over which static neighbors have been defined
C. By adding subnets redistributed on the local router from another routing source
D. By adding all subnets listed by the show ip route static command
Correct Answer: BC Explanation
Explanation/Reference:
Explanation:
Other than the two listed correct answers, the local router also adds connected routes for which the network command matches the corresponding
interfaces, so it may not add all connected routes. Also, EIGRP does not add static routes to the EIGRP topology table, unless those routes are
redistributed.
QUESTION 62
An engineer has added the following configuration snippet to an implementation planning document. The configuration will be added to Router R1, whose Fa0/0 interface connects to a LAN to which Routers R2 and R3 also connect. R2 and R3 are already EIGRP neighbors with each other. Assuming the snippet shows all commands on R1 related to EIGRP authentication, which answer lists an appropriate comment to be made during the implementation plan peer review?
key chain fred key 3 key-string whehew interface fa0/0 ip authentication key-chain eigrp 9 fred
A. The configuration is missing one authentication-related configuration command.
B. The configuration is missing two authentication-related configuration commands.
C. Authentication type 9 is not supported; type 5 should be used insteaD.
D. The key numbers must begin with key 1, so change the key 3 command to key 1.
Correct Answer: A Explanation
Explanation/Reference:
Explanation:
The configuration requires the ip authentication mode eigrp asn md5 command, which is currently missing. This command enables MD5-style
authentication, rather than the default of no authentication. Adding this one command completes the configuration. Any valid key numbers can be used.
Also, the 9 in the ip authentication key-chain eigrp 9 fred command refers to the EIGRP ASN, not an authentication type.
QUESTION 63
Which of the following settings could prevent two potential EIGRP neighbors from becoming neighbors? (Choose two answers.)
A. The interface used by one router to connect to the other router is passive in the EIGRP process.
B. Duplicate EIGRP router IDs
C. Mismatched Hold Timers.
D. IP addresses of 10.1.1.1/24 and 10.2.2.2/24, respectively.
Correct Answer: AD Explanation
Explanation/Reference:
QUESTION 64
Based on the need to limit processing and bandwidth utilization due to dynamic routing protocol operation, the following routing requirements have been specified for your network.
-Partial and incremental routing updates -Only the devices affected by a topology change perform route recomputation
– Route recomputation only occurs for routes that were affected
Which dynamic routing protocol should be deployed in your network to best meet these requirements?
A. BGP
B. OSPF
C. IS-IS
D. EIGRP
E. RIPv2
Correct Answer: D Explanation
Explanation/Reference:
Explanation:
The bandwidth utilization issue has been addressed by implementing partial and incremental updates. Therefore, only when a topology change occurs
does routing information get sent. Regarding processor utilization, the feasible successor technology greatly reduces the total processor utilization of an
AS by requiring only the routers that were affected by a topology change to perform the route recomputation. Furthermore, the route recomputation only
occurs for routes that were affected. Only those data structures are accessed and used. This greatly reduces search time in complex data structures.
Reference:
QUESTION 65
Refer to the exhibits. Router B should advertise the network connected to the E0/0/0 interface to router A and block all other network advertisements. The IP routing table on router A indicates that it is not receiving this prefix from router B. What is the probable cause of the problem?
A. An access list on router B is causing the 192.168.3.16/28 network to be denied.
B. An access list on router B is causing the 192.168.3.32/28 network to be denied.
C. The distribute list on router B is referencing a numbered access list that does not exist on router B.
D. The distribute list on router B is referencing the wrong interface.
Correct Answer: A Explanation
Explanation/Reference:
Explanation
This is an unclear question. The question says “Router B should advertise the network connected to the E0/0/0 interface to router A and block all other network advertisements. The IP routing table on router A indicates that it is not receiving this prefix from router B.” That means the network 192.168.3.16/28 (including the IP 192.168.3.21/28) is not received on router A -> A is the most suitable answer.
Note: Distribute list are used to filter routing updates and they are based on access lists.
QUESTION 66
Refer to the exhibit. Router B and router C are performing mutual redistribution between OSPF and EIGRP, and their default metrics are configured the same. Router D has equal cost paths to networks where both paths are not really equal cost. For example, network 172.16.54.0 shows equal cost through both router B and router C, though in reality the cost is greater using router C. Other routers, though not shown, are connected to the
172.16.54.0 and 172.16.55.0 networks, and the same issues exist to those routers and the networks connected to them. What can be done so that data will be routed along the most optimal path in the network?
A. Redistribute connected interfaces on router B and router C.
B. Set the maximum number of equal cost paths to 1 in all routers.
C. When redistributing EIGRP into OSPF, set the external metric type to type E1.
D. Adjust the default metrics in router B and router C so that the values are different in each router.
E. None of these solutions will fix the problem. Migrate to a single dynamic routing protocol.
Correct Answer: E Explanation
Explanation/Reference:
Explanation
From the output, we learn that all the External OSPF routes have metrics of 100 (the second parameters in [110/100]). This is not the default metric of OSPF Type 2 External route (the default value is 20) so the metrics of redistributed routes have been modified. Maybe when redistributing into OSPF, the “metric” in the “redistribute” command or the “default-metric” command was used on router B & C to assign the metric of these routes. Something like this: router ospf 1 redistribute eigrp 1 metric 100 subnets or
router ospf 1 ….. default-metric 100 Therefore even if we use the metric type E1 the problem still exists because the link B-D & C-D seems to have the same metric -> the total metrics remains the same .
We can use route-map and set different metrics for each networks but some unshown networks will have the same issues –
QUESTION 67
Based on the exhibited output,
Which three statements are true? (Choose three.)
A. R1 isin AS 200.
B. R1 will load balance between three paths to reach the 192.168.1.48/28 prefix because all three paths have the same advertised distance (AD) of 40512000.
C. The best path for R1 to reach the 192.168.1.48/28 prefix is via 192.168.1.66.
D. 40512000 is the advertised distance (AD) via 192.168.1.66 to reach the 192.168.1.48/28 prefix.
E. All the routes are in the passive mode because these routes are in the hold-down state.
F. All the routes are in the passive mode because R1 is in the query process for those routes.
Correct Answer: ACD Explanation
Explanation/Reference:
Explanation:
It can be determined that AS 200 is used, from the fact that the IS-IS process ID is labeled as 200. The best path to reach the network 192.168.1.48/28
is the first one displayed in the routing table. This can be further demonstrated by the fact that the metric is less than the alternative route, via serial 0.
Finally, the AD can be found by viewing the second number within the parentheses, which in this case is 40512000.
QUESTION 68
Study the exhibit carefully.
Router R1 is connected to networks 172.16.1.0 /26 and 172.16.1.64 /27. Based on the partial output in the exhibit, which description is correct?
A. Router R1 should be reconfigured with an ACL instead of an ip prefix-list command.
B. Router R1 will advertise both routes.
C. Router R1 will deny the 172.16.1.0/27 route while permitting the 172.16.1.0/26 route to be advertised.
D. Router R1 will deny the 172.16.1.0/26 route while permitting the 172.16.1.64/27 route to be advertised.
Correct Answer: C Explanation Explanation/Reference:
Explanation Prefix lists are configured with permit or deny keywords to either permit or deny the prefix based on the matching condition. A prefix list consists of an IP address and a bit mask. The IP address can be a classful network, a subnet, or a single host route. The bit mask is entered as a number from 1 to 32.
Prefix lists are configured to match an exact prefix length or a prefix range. The ge and le keywords are used to specify a range of the prefix lengths to match, providing more flexible configuration than can be configured with just the network/length argument. The prefix list is processed using an exact match when neither ge nor le keyword is entered.
Therefore in this case the exact 172.16.1.0/26 network is permitted while other networks are denied.
QUESTION 69
Refer to the exhibit.
BigBids Incorporated is a worldwide auction provider. The network uses EIGRP as its routing protocol throughout the corporation. The network
administrator does not understand the convergence of EIGRP. Using the output of the show ip eigrp topology all-links command, answer the administrator’s question.
Which two networks does the Core1 device have feasible successors for? (Choose two)
A. 172.17.0.0/30
B. 172.17.1.0/24
C. 172.17.2.0/24
D. 172.17.3.0/25
E. 172.17.3.128/25
F. 10.140.0.0/24
Correct Answer: AF Explanation
Explanation/Reference:
Explanation To understand the output of the “show ip eigrp topology all-links command” command, let’s analyze an entry (we choose the second entry because it is better for demonstration than the first one)
The first line tells us there is only 1 successor for the path to 10.140.0.0/24 network but there are 2 lines below. So we can deduce that one line is used for successor and the other is used for another route to that network. Each of these two lines has 2 parameters: the first one (“156160 or “157720) is the Feasible Distance (FD) and the second (“128256 or “155160) is the Advertised Distance (AD) of that route.
The next thing we want to know is: if the route via 172.17.10.2 (the last line) would become the feasible successor for the 10.140.0.0/24 network. To figure out, we have to compare the Advertised Distance of that route with the Feasible Distance of the successor’s route, if AD < FD then it will become the feasible successor. In this case, because AD (155160) < FD (156160) so it will become the feasible successor. Therefore we can conclude the network 10.140.0.0/24 has 1 feasible successor.
Because the question asks about feasible successor so we just need to focus on entries which have more paths than the number of successor. In this case, we find 3 entries that are in blue boxes because they have only 1 successor but has 2 paths, so the last path can be the feasible successor.
By comparing the value of AD (of that route) with the FD (of successor’s route) we figure out there are 2 entries will have the feasible successor: the first and the second entry. The third entry has AD = FD (30720) so we eliminate it.
QUESTION 70
Refer to the exhibit.
BigBids Incorporated is a worldwde auction provider. The network uses EIGRP as its routing protocol throughout the corporation. The network administrator does not understand the convergence of EIGRP. Using the output of the show ip eigrp topology all-links command, answer the administrator’s question.
Which three EIGRP routes will be installed for the 172.17.3.128/25 and 172.17.2.0/24 networks? (Choose three)
A. 172.17.3.128.25 [90/28160] via 172.17.1 2, 01:26:35, FastEthernet0/2
B. 172.17.3.128/25 [90/30720] via 172.17.3.2, 01:26:35. FastEthemet0/3
C. 172.17.3.128/25 [90/30720] via 172.17.10.2, 01:26:35. FastEthernet0/1
D. 172.17.2.0/24 [90/30720] via 172.17.10.2, 02:10:11, FastEthernet0/1
E. 172.17.2.0/24 [90/28160] via 172.17.10.2, 02:10:11. FastEthernet0/1
F. 172.17.2.0/24 [90/33280] via 172.17.3.2, 02:10:11. FastEthernet0/3
Correct Answer: BCD Explanation
Explanation/Reference:
Explanation
First indicate the positions of these networks:
Network 172.17.3.128/25 has 2 successors, therefore the two paths below are both successors.
Network 172.17.2.0/24 has only 1 successor, therefore the path lies right under it is the successor.
QUESTION 71
Refer to the exhibit.
BigBids Incorporated is a worldwide auction provider. The network uses EIGRP as its routing protocol throughout the corporation. The network administrator does not understand the convergence of EIGRP. Using the output of the show ip eigrp topology all-links command, answer the administrator’s question.
Which three networks is the router at 172.17.10.2 directly connected to? (Choose three)
A. 172.17.0.0/30
B. 172.17.1.0/24
C. 172.17.2.0/24
D. 172.17.3.0/25
E. 172.17.3.128/25
F. 172.17.10.0/24
Correct Answer: CEF Explanation
Explanation/Reference:
Explanation: First, we should notice about the entry in the orange box, it shows that the network 172.17.10.0/24 is directly connected with this router and has a FD of 28160. So we can guess the networks that directly connected with router at 172.17.10.2 will be shown with an AD of 28160. From that, we find out 3 networks which are directly connected to the router at 172.17.10.2 (they are green underlined). The network 172.17.10.0/24 is surely directly connected to the router at 172.17.10.2 (in fact it is the network that links the router at 172.17.10.2 with Core1 router).
QUESTION 72
Which two statements are true about EIGRP manual summarization? (Choose two.)
A. Manual summarization is configured on a per interface basis.
B. Manual summaries can be configured with the classful mask only.
C. When manual summarization is configured, autosummarization is automatically disabled by default.
D. The summary address is assigned an administrative distance of 10 by default.
E. The summary address is entered into the routing table and is shown to be sourced from the Null0 interface.
Correct Answer: AE Explanation
Explanation/Reference:
Explanation:
You can configure a summary addresses on a per-interface basis. You need to manually define summary addresses if you want to create summary addresses that do not occur at a network number boundary or if you want to use summary addresses on a ASA with automatic route summarization disabled. If any more specific routes are in the routing table, EIGRP will advertise the summary address out the interface with a metric equal to the minimum of all more specific routes.
QUESTION 73
Refer to the exhibit.
ROUTE.com is planning to implement EIGRP load balancing for traffic between hosts on the 172.16.10.0/24 and 172.16.20./24 networks. You have been asked to review the implementation plan for this project. Which statement about the plan is true?
A. It is complete as written.
B. It should include a task to configure multipath to equal a value of 2 on R1 and R4.
C. It should use a ping instead of a traceroute to validate that load balancing has been activated.
D. It should contain a task that documents the changes made to the configurations.
Correct Answer: A Explanation
Explanation/Reference:
Explanation:
This implementation plan is complete because it has all the requirements for an EIGRP load balancing process.
QUESTION 74
A network administrator is managing a hub-and-spoke network with EIGRP routing that has been enabled. The hub router is trying to query a remote router. However, delays are occurring that are caused by certain paths being stuck in active (SIA). How should the administrator configure EIGRP in order to limit the scope of the query range and prevent SIA from occurring?
A. Configure the hub router with a scope limit of 1.
B. Configure the remote router with a scope limit of 1.
C. Configure the hub to indicate that the remote router is a stub router.
D. Configure the hub and remote router as stub routers.
E. Configure the remote router as a stub router.
F. Disable the SIA feature of EIGRP on the remote router.
Correct Answer: E Explanation
Explanation/Reference:
Explanation:
Configuring a router as a stub also helps the rest of the network. Queries are responded to much quicker and convergence happens much faster.
Sometimes a query can cause delays that result in the path being SIA. If the stub configuration is applied, the router responds to queries as
inaccessible, thus limiting the scope of the query range and preventing SIA from occurring.
QUESTION 75
What administrative distance is given to EIGRP summary routes?
A. 0
B.1
C.5
D. 90
E. 95
F. 170
Correct Answer: C Explanation
Explanation/Reference:
Reference:
QUESTION 76
What are two possible causes for EIGRP Stuck-In-Active routers? (Choose Two)
A. Some query or reply packets are lost between the routers.
B. The neighboring router starts receiving route updates from this router.
C. A failure causes traffic on a link between two neighboring routers to flow in only one direction (unidirectional link).
D. The neighboring router stops receiving ACK packets from this router.
Correct Answer: AC Explanation
Explanation/Reference:
Explanation: Generally, a route shown as Active is going to be there for a very short period of time by the time you repeat the command, hopefully that Active route has gone Passive. Sometimes that doesn′t happen, though, and the route becomes SIA -Stuck In Active. A route becomes SIA when a query goes unanswered for so long that the neighbor relationship is reset. From experience, I can tell you that troubleshooting SIA routes is more of an art form than a science, but there are four main reasons a route becomes SIA:
The link is unidirectional, so the query can′t possibly be answered. The queried router′s resources are unavailable, generally due to high CPU utilization. The queried router′s memory is corrupt or otherwise unable to allow the router to answer the query.
The link between the two routers is of low quality, allowing just enough packets through to keep the neighbor relationship intact, but not good enough to allow the replies through.
To sum it up, routes generally become SIA when a neighbor either doesn′t answer a query, or either the query or reply took a wrong turn somewhere. I told you it wasn′t the easiest thing to troubleshoot!
QUESTION 77
When configuring EIGRP to run across a 56 Kbps serial PPP link, what command do you need to put under the serial interface ensure proper convergence of EIGRP routes?
A. bandwidth 56
B. bandwidth 56000
C. ip bandwidth-percent eigrp 1 56
D. ip bandwidth-percent eigrp 1 56000
Correct Answer: A Explanation
Explanation/Reference:
Explanation: When configuring serial links using EIGRP it is important to configure the bandwidth setting on the interface. If the bandwidth setting is not changed for these interfaces EIGRP assumes the default bandwidth on the link instead of the true bandwidth. If the link is slower, the router may not be able to converge, routing updates might become lost, or suboptimal path selection may result. Router(config-if)#bandwidth kilobits The value, kilobits, indicates the intended bandwidth in kilobits per second. For generic serial interfaces, such as PPP or HDLC, set the bandwidth to the line speed.
QUESTION 78
Refer to the Exhibit.
Routers in the Diagram are configured with EIGRP. If RTB and RTC fail, which action will RTA take with respect to the HQ network?
A. RTA will automatically route packets via RTD to the HQ network.
B. RTA will place the route via RTD into the hold down state.
C. RTA will go into the active state for all routers.
D. RTA will go into the active state for the route to HQ network.
Correct Answer: D Explanation Explanation/Reference:
Explanation:
When RTB and RTC fails, RTA will go into active state for the HQ network route.
QUESTION 79
Exhibit: Refer to the topology diagram R3 is redistributing the EIGRP routers into OSPF. What will the EIGRP routes appear in the routing table of R1?
A.O
B.
O IA
C.
E2
D.D
E.
D EX
Correct Answer: C Explanation
Explanation/Reference:
QUESTION 80
In EIGRP, when the IP default-network command is configured on a router, what is generated in the router’s configuration?
A. A static route
B. A directly connected route
C. An EIGRP route
D. A default route
Correct Answer: A Explanation
Explanation/Reference:
Explanation: When you configure the ip default-network command and specify a subnet, a static route (the ip route command) is generated in the router’s configuration; however, the IOS does not display a message to indicate that this has been done. The entry appears as a static route in the routing table of the router where the command is configured. This can be confusing when you want to remove the default network; the configuration must be removed with the no ip route command, not with the no ip default-network command.
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