5.1. Layer 3 Protocols
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The most common protocol in this
layer is IPv4.
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Another protocol which is commonly used is ICMP
(Internet Control Message Protocol), which is used for various
network control tasks.
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The ping command is the most common use of ICMP.
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Other protocols exist in this layer, and most of them are supported by
the Linux kernel, but they are only rarely used.
Written by Shlomi Fish