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Explanation: The TCP/IP protocol stack is very similar to the OSI model protocol stack. With TCP/IP
connection orientated and connection less communication is possible. Both IP and UDP are both
connectionless. TCP is a connection-orientated protocol.
Incorrect Answers:
B is incorrect; RARP and not ARP provide this functionality.
D is incorrect; ICMP is connection less.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 215-218.
Q. 83
What is the two most common request/reply pair with ICMP messages when using the ping command?
(Choose two)
A. Echo reply
B. Echo request
C. Source quench
D. Fragment offset
E. Information redirect
F. Destination reachable
G. Echo control message
Answer: A and B.
Explanation: The most common form of these messages are pings, ICMP echo request, and ICMP echo replies.
Incorrect Answers:
C, D, E, F, and G are incorrect; these are not types of ICMP messages.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 217-219.
Q. 84
Which two protocol tools use ICMP? (Choose two)
A. Ping
B. Telnet
C. Configure
D. Trace route
E. Show commands
F. Standard access list
Answer: A, D