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QUESTION 42
Which of the following best describes an Ethernet bridge?
A. A passive device simply used to connect two or more cables. Does not generate or amplify any signals.
B. A device that receives and retransmits a signal out its other ports, but does not do any Layer 2 analysis of the data.
C. A device that receives a signal and based on the Layer 2 destination address, makes a decision on which ports the signal should be retransmitted.
D. A device that receives a signal and based on the Layer 3 destination address, makes a decision on which ports the signal should be retransmitted.
Correct Answer: C QUESTION 43
What happens immediately after an Ethernet switch receives an Ethernet frame?
A. It records the destination MAC address and the interface on which it arrived.
B. It records the source MAC address and the interface on which it arrived
C. It floods the frame out of all its interfaces except the interface on which the frame arrived.
D. It transmits the frame out of the appropriate interface.
Correct Answer: B
QUESTION 44
What is the behaviour of a typical Ethernet switch when it receives a frame with a unicast destination MAC address? (Choose two)
A. The switch floods the frame out of all ports except the port on which it was received.
B. The switch looks in its FDB. If the source address is unknown it discards the frame.
C. The switch looks in its FDB. If the destination address is known it forwards the frame out the appropriate interface.
D. The switch looks in its FDB. If the destination address is unknown it floods the frame out all ports except the port on which it was received.
E. E. The switch looks in its FDB. If the destination address is unknown it discards the frame.
Correct Answer: CD
QUESTION 45
Which technologies can be used with Ethernet switches to achieve redundancy? (Choose two)
A. LAG
B. OSPF
C. RIP
D. STP
Correct Answer: AD
QUESTION 46
In what type of network is a broadcast storm likely to occur?
A. An Ethernet network with redundant paths not running STP.
B. An ATM network.
C. A SONET network.
D. All of the above.
Correct Answer: A
QUESTION 47
What problems was Spanning Tree Protocol (STP) primarily designed to solve? (Choose two):
A. Providing path redundancy.
B. Preventing loops.
C. Handling collisions.
D. Allowing flooding of multicast traffic.
Correct Answer: BC
QUESTION 48
Which of the following is a feature of a VLAN?
A. A VLAN allows multiple Ethernet switches to be connected in a single broadcast domain.
B. A VLAN allows multiple Ethernet switches to be connected in a single collision domain.
C. A VLAN can separate ports on the same switch into different broadcast domains.
D. A VLAN can separate ports on the same switch into different collision domains.
Correct Answer: C QUESTION 49
What is required if devices on different VLANs wish to communicate with each other?
A. Devices on different VLANs cannot communicate with each other.
B. Devices on different VLANs can communicate with each other as long as they are connected to the same switch.
C. Devices on different VLANs can communicate with each other as long as the switches they are attached to are connected to each other with an Ethernet connection.
D. Devices on different VLANs can communicate with each other if there is an IP router to connect the VLANs.
Correct Answer: D QUESTION 50
A 24 port Ethernet switch is configured with VLAN 100 on ports 1 – 8, VLAN 200 on ports 9 – 16 and VLAN 300 on ports 17 – 24. Which of the following describes the behavior of the switch when a broadcast frame is received on port 1?
A. The switch will discard the broadcast frame because there is no specific destination address.
B. The switch will flood the broadcast frame on all ports on which the switch has seen frames from attached devices
C. The switch will flood the broadcast frame on ports 2 to 8.
D. The switch will flood the broadcast frame on all 24 ports.
Correct Answer: C QUESTION 51
The method by which Ethernet frames are associated to a specific VLAN is referred to as:
A. Segmenting.
B. Stacking.
C. Routing.
D. Tagging.
Correct Answer: D QUESTION 52
What information is used to separate VLANs on a VLAN trunk that connects multiple VLANs?
A. VLAN tag.
B. IP Header.
C. FCS.
D. Priority Value.
Correct Answer: A QUESTION 53
Using Q-in-Q Virtual Local Area Network (VLAN) stacking, how does a carrier differentiate one customers traffic from that of another?
A. The provider edge (PE) switch adds an additional field called a PE tag to the customers Layer 2 data.
B. The PE switch replaces the customers VLAN tag with a carrier-assigned tag.
C. The PE switch adds a second VLAN tag to identify the customers traffic on the carriers network.
D. The PE switch assigns a customer-specific priority label to the customers traffic. Correct Answer: C
QUESTION 54
What is the purpose of the Data Link Layer in the OSI model?
A. The Data Link Layer is responsible for encapsulating the packet into a frame for transmission on the transmission media.
B. The Data Link Layer is responsible for encapsulating the packet into an IP header and routing the packet.
C. The Data Link Layer is responsible for formatting the packet for applications such as JPEG format.
D. The Data Link Layer is responsible for timing of the signals on the transmission media
Correct Answer: A
QUESTION 55
Which of the following is typically a characteristic of Layer 2 framing?
A. Provides a universal addressing scheme to uniquely identify destinations in the network.
B. The size of the Layer 2 frame cannot exceed 1518 bytes.
C. Provides error checking of the frame contents after transmission.
D. All the above.
Correct Answer: C
QUESTION 56
Which of the following is NOT an example of a Layer 2 protocol?
A. POS
B. IP
C. ATM
D. Frame Relay
E. Ethernet
Correct Answer: B
QUESTION 57
Why is the address field in a PPP header always set to “11111111”?
A. PPP supports multipoint access networks with many stations. The all 1’s acts as a broadcast.
B. PPP supports multipoint access networks with many stations. The all 1’s acts as a multicast.
C. PPP supports point-to-point networks only. The address field is fixed.
D. PPP supports point-to-point networks only. The address field can change dynamically since every station is assigned a PPP address.
Correct Answer: C
QUESTION 58
Which ATM adaptation layer is commonly used for transporting IP datagrams or non-real time data?
A. AAL0
B. AAL1
C. AAL2
D. AAL3/4
E. AAL5
Correct Answer: E
QUESTION 59
Which of the following is a characteristic of ATM?
A. Application data is transported in 53-byte cells.
B. ATM circuits are identified by a VPI/VCI value.
C. Provides enhanced QoS support with 5 classes of service.
D. Ideal for multiple services on the same physical line.
E. All of the above.
F. None of the above
Correct Answer: E
QUESTION 60
What is the basic unit of framing in SONET and the bit rate for its transmission?
A. STS-1 with a bit rate of 1.544 Mbit/s
B. STS-1 with a bit rate of 2.048 Mbit/s
C. STS-1 with a bit rate of 51.84 Mbit/s
D. STS-1 with a bit rate of 155.52 Mbit/s
Correct Answer: C
QUESTION 61
What is the basic unit of framing in SDH and the bit rate for its transmission?
A. STM-1 with a bit rate of 1.544 Mbit/s
B. STM-1 with a bit rate of 2.048 Mbit/s
C. STM-1 with a bit rate of 51.84 Mbit/s
D. STM-1 with a bit rate of 155.52 Mbit/s
Correct Answer: D
QUESTION 62
Which of the following are examples of Time Division Multiplexing (Choose two)?
A. Ethernet.
B. Token-Ring.
C. SONET/SDH.
D. E1 carrier.
E. PPP
Correct Answer: DE
QUESTION 63
How many DS-3 frames can be transported in an OC-3 frame?
A. 1
B. 2
C. 3
D. 4
Correct Answer: C
QUESTION 64
Who was responsible for developing and publishing the original standard that was used for 10 Mbit/s Ethernet?
A. Intel Corporation.
B. Digital Equipment Corporation.
C. DEC-Intel-Xerox.
D. Apple Computer.
E. IBM
Correct Answer: C
QUESTION 65
Which Ethernet frame field does the receiver use to verify the integrity of the received bits?
A. Destination address.
B. Frame check sequence.
C. Preamble.
D. Length field.
Correct Answer: B
QUESTION 66
How is Ethernet II different from Ethernet 802.3?
A. Ethernet 802.3 can only be used on point-to-point links, while Ethernet II can be used on broadcast networks.
B. In Ethernet II the 2 bytes after the source MAC address is used as a type indicator. In Ethernet 802.3 these two bytes indicate the length of the frame.
C. In Ethernet 802.3, the 2 bytes after the source MAC address is used as a type indicator. In Ethernet II these two bytes indicate the length of the frame.
D. Ethernet II and Ethernet 802.3 are two different names for the same protocol
Correct Answer: B
QUESTION 67
Given the Mac Address 00-20-60-ce-2b:28, which part is the Organizationally Unique Identifier (OUI)?
A. 2b:28
B. 00-20
C. ce-2b:28
D. 00-20-60
Correct Answer: D
QUESTION 68
Which of the following type of addressing scheme delivers information from one source to all devices who are members of a specific group?
A. Anycast.
B. Multicast.
C. Broadcast.
D. Unicast.
Correct Answer: B
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