1. ICMP messages can have a variety of forms. TTL Exceeded, on the other hand, lacks Sequence and Identifier fields. Explain how the receiver can securely identify and process all of the ICMP fields if it is not aware of them ahead of time. What sort of ICMP message to expect ahead of time?
2. Why should TTL be set in IP packets?
3. Why can't an ICMP error-reporting message be sent if an error occurs when transferring ICMP datagrams?
4. What sorts of ICMP packets may a router send? What sorts of ICMP messages may a destination host send?
5. Does the checksum in ICMP packets cover the payload?

Answer rating: 100% (QA)

1 ICMP messages contain a Type field that indicates the purpose or category of the message When a receiver receives an ICMP message it examines the Type field to determine how to interpret and process ... View the full answer