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Answer: B
Explanation: Acknowledgement is required to insure packets were not loss and this is how a reliable transport
layer connection is maintained.
Incorrect Answers:
A is incorrect; route selection is performed by the network layer.
C and D are incorrect; these are not transport layer functions.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 28-30.
Q. 81
Using the TCP/IP suite a message is sent from host A to a destination IP address on the same LAN. How
does host A determine the destination’s MAC address?
A. It uses a Proxy ARP.
B. It uses ARP requests.
C. It uses RARP requests.
D. It uses router look up table.
Answer: B
Explanation: Address Resolution Protocol is used to resolve or map a known destination IP address to a MAC
sublayer address to allow communication.
Incorrect Answers:
A is incorrect; Proxy ARP is most often used with hosts on separate subnets.
C is incorrect; Reverse ARP is used to resolve an IP address on a given MAC address.
D is incorrect; a router’s table is not used for this.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 218-220.
Q. 82
Which three statements about common elements of the TCP/IP protocol stack are true? (Choose three)
A. IP provides connection less service and routing capabilities.
B. ARP enables devices to locate the IP address of local devices.
C. UDP provides simple connection less service without windowing or acknowledgements.
D. ICMP provides connection oriented management data to routers and layer three switches.
E. TCP enables devices to send large quantities of data using switching in a connection-oriented
manner.
Answer: A, C, E