Computer Networks - ICMP
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Last updated 10:45 PM on 4/21/24
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8 Terms
1
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ICMP
Internet Control Message Protocol
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ICMP RFC
792
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ICMP’s protocol layer
Layer 3
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RTT
Round trip time, as reported by ICMP packet.
5
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Two commands ICMP packets are used in
Ping and traceroute
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Fields of an ICMP packet
Type: 8 bits, identifies the message type, 8 or 0
Code: 8 bits, not used in echo messages, 0
Checksum: 16-bit
Identifier: 16-bit
Sequence Number: 16-bit
Optional Data
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Type value for echo
8
8
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Type value for echo reply
0
Note 
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