related to IP that it is not possible to operate hosts within an IP network without
supporting ICMP.
2.1 Choosing to Use IP
It is pretty central to the success of this book that IP is chosen as the core
network protocol for your network. Everything else in this book depends on
that choice since all of the many protocols described utilize IP to carry their
messages, use IP addresses to identify nodes and links, and assume that data is
being carried using IP.
Fortunately, IP has already been chosen as the network protocol for the
Internet and we don't have to
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