Interview questions on ICMP

Name two network commands which uses ICMP at the network layer

Ping and Tracert

Which transport layer protocol does ICMP use

ICMP does not use any transport layer protocol.

Which two fields in the ICMP header is used for identifying the intent of ICMP message

Type and Code

What feature on a router can be used to block an ICMP packet

Access control lists

Which port number does ICMP use

ICMP does not use any port number as it does not use any transport layer protocols.

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