ConceptsICMP
ICMP
Internet Control Message Protocol: a network protocol used for diagnostics and error messages (such as ping and unreachable notifications). Defenders watch it because attackers can abuse it for scanning, tunneling, or covert channels.
8 direct links3 lessons
Concept Neighborhood
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Network
The most substantial related concept here, covered by 8 lessons.
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Packet
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TCP/IP Model
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Reconnaissance
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Connection State
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Egress
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