640 - 607
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
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
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
Answer: A, C, E
Leading the way in IT testing and certification tools, www.testking.com
- 55 -
