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An understanding of the following key
points should have been achieved:
- IP is a best-effort delivery method
that uses ICMP messages to alert the sender that the data did not
reach its destination.
- ICMP echo request and echo reply
messages allow the network administrator to test IP connectivity to
aid in the troubleshooting process.
- ICMP messages are transmitted using
the IP protocol so their delivery is unreliable.
- ICMP packets have their own special
header information starting with a type field and a code field.
- Identify potential causes of
specific ICMP error messages
- The functions of ICMP control
messages
- ICMP redirect/change request
messages
- ICMP clock synchronization and
transit time estimation messages
- ICMP information request and reply
messages
- ICMP address mask request and reply
messages
- ICMP router discovery message
- ICMP router solicitation message
- ICMP congestion and flow control
messages
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