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QUESTION 134
Which is the public AS in the diagram?
A. 65001
B. 65003
C. 2002
D. All of the above.
E. None of the above.
Correct Answer: C
QUESTION 135
In the diagram, what type of BGP session is established between the routers of AS 2002?
A. IGP
B. IBGP
C. EBGP
D. EGP
E. BGP can not be run between routers in the same AS.
Correct Answer: B
QUESTION 136
In the diagram, what type of BGP session is established between the routers of AS 65001 and AS 2002?
A. IGP
B. IBGP
C. EBGP
D. EGP
E. BGP can not be run between routers in different ASs.
Correct Answer: C
QUESTION 137
Which of the following statements describes the purpose of the Transport Layer in the TCP/IP stack?
A. Provides a data transport service to higher protocol layers.
B. Provides a data transport service for routing and control protocols such as OSPF and ICMP.
C. Provides a universal address plan to uniquely identify every device in the network.
D. Defines a standard method for framing data for transmission on the physical network medium.
Correct Answer: A QUESTION 138
Which of the following is NOT a function of TCP?
A. Maintaining the ordering of data transmitted across the network.
B. Maintaining the ordering of data transmitted across the network.
C. Providing the receiver with a flow control mechanism.
D. Defining the method for routing data across the network.
Correct Answer: D QUESTION 139
What must occur before two hosts can exchange data using TCP?
A. Nothing. The two hosts can send data to each other at any time.
B. The two hosts must negotiate a path MTU to be used for the data exchange.
C. The two hosts must perform a 3-way handshake before transmitting data.
D. The two hosts must exchange encryption keys before transmitting data.
Correct Answer: C QUESTION 140
Host A is transmitting data to host B on a TCP connection. What is the purpose of the ACK sent by host B?
A. The ACK tells the host A that host B wishes to establish a session.
B. The ACK tells host A the sequence number of the segment that was just received by host B.
C. The ACK tells host A the sequence number of the next segment that host B expects to see.
D. The ACK is flow control from host B and tells host A to reduce its transmission rate.
Correct Answer: C QUESTION 141
Host A receives a TCP SYN/ACK segment. What does this signify?
A. Host A has received a request to establish a TCP session.
B. Host A has received a request to close a TCP session
C. A TCP session is now established to host A
D. The TCP session has been terminated due to a timeout.
Correct Answer: C QUESTION 142
What is the purpose of the source and destination ports in the TCP header?
A. These ports identify the physical location of the sender and the receiver on the IP router.
B. These ports are used as addresses to communicate with the IP layer.
C. TCP does not use source or destination ports.
D. These ports are used as an address to identify the upper layer application using the TCP connection.
Correct Answer: D QUESTION 143
Which of the following is NOT a field in a TCP header?
A. Source port.
B. MTU.
C. Sequence number.
D. Acknowledgement number.
E. Window size.
Correct Answer: B
QUESTION 144
Which of the following fields is not a field in the TCP header used for the establishment and termination of a TCP connection?
A. TTL
B. ACK
C. FIN
D. SYN
Correct Answer: A
QUESTION 145
The sequence numbers are used by TCP to ensure that the data receive is provided to the application in the correct order.
A. TRUE
B. FALSE
Correct Answer: A
QUESTION 146
What happens in a TCP session if a segment is not acknowledged within a certain time period?
A. The missing segment is retransmitted.
B. The TCP session is terminated.
C. The sender sends the next segment.
D. An ICMP destination unreachable message is sent.
Correct Answer: B
QUESTION 147
What is the purpose of TCP flow control?
A. It restricts the sender from sending too much data when there is congestion in the network.
B. It allows the receiver to control the rate at which the sender transmits data.
C. It forces the sender to send only one segment at a time .
D. It allows the receiver to drop segments without the sender having to retransmit.
Correct Answer: B
QUESTION 148
Which field in the TCP header is used by the receiver to indicate how many segments it can receive?
A. Checksum
B. SYN
C. Destination port.
D. Window size.
E. MTU
Correct Answer: D QUESTION 149
What must the sender do when it receives a window size of 0 from the receiver?
A. Stop transmitting.
B. Terminate the TCP session.
C. Send the next segment.
D. Retransmit the previous segment.
Correct Answer: A QUESTION 150
Which of the following statements BEST describes the purpose of UDP (Select two)?
A. Provide a connectionless delivery service.
B. Provide a connection oriented delivery service.
C. Provide an unreliable transmission service.
D. Provide a reliable transmission service.
Correct Answer: AC QUESTION 151
Why does UDP have less overhead then TCP?
A. UDP has less overhead because it is only used for transmission of small amounts of data.
B. UDP has less overhead then TCP because there is no checksum field in UDP.
C. UDP overhead is the same as TCP because it uses the same fields in the header.
D. UDP has less overhead because there is no requirement for acknowledgment or retransmission.
Correct Answer: D QUESTION 152
Which application below would be likely to use UDP ?
A. Real-time audio application such as VoIP.
B. Web browser.
C. Email application.
D. Telnet.
Correct Answer: A QUESTION 153
How does the Transport Layer identify which application is to receive the data?
A. Using the IP address of the packet.
B. Using the MAC address of the frame.
C. Using port numbers.
D. Using Connection Identifier Numbers (CIN).
Correct Answer: C QUESTION 154
What capability of TCP/IP allows two hosts to have multiple TCP sessions to each other simultaneously?
A. The combination of IP source and destination address and TCP source and destination port uniquely identifies each session.
B. The combination of IP source and destination address and the IP protocol field uniquely identifies each session.
C. The hosts can identify the sessions using each others MAC addresses.
D. Two hosts can not have multiple TCP sessions simultaneously.
Correct Answer: A
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