IP Characteristics
Figure 1-15 shows the IP version 4 packet header format.
Figure 1-15 IP Version 4 Packet Header Format
The functions of the fields in an IPv4 header are as follows:
Version field: The Version field indicates IPv4 (with a value of 0100).
Header Length field: The Header Length field (commonly referred to as the Internet Header Length (IHL) field) is a 4-bit field indicating the number of 4-byte words in the IPv4 header.
Type ...
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