N10-005 · Question #415
Which of the following uses types and codes rather than ports?
The correct answer is B. ICMP. ICMP (Internet Control Message Protocol) uses a Type field and a Code field to classify messages rather than port numbers. For example, Type 8 Code 0 is an Echo Request (ping), Type 0 Code 0 is an Echo Reply, and Type 3 identifies Destination Unreachable with various codes…
Question
Which of the following uses types and codes rather than ports?
Options
- AEIGRP
- BICMP
- CUDP
- DIPv6
How the community answered
(30 responses)- A7% (2)
- B90% (27)
- C3% (1)
Explanation
ICMP (Internet Control Message Protocol) uses a Type field and a Code field to classify messages rather than port numbers. For example, Type 8 Code 0 is an Echo Request (ping), Type 0 Code 0 is an Echo Reply, and Type 3 identifies Destination Unreachable with various codes indicating the specific reason (e.g., Code 0 = network unreachable, Code 1 = host unreachable). UDP and TCP use port numbers to identify services. EIGRP is a routing protocol that runs directly over IP (protocol number 88). IPv6 is a network layer addressing protocol, not a transport protocol.
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