Describe the IPv4 Header Length field.
What will be an ideal response?
The Header Length field, also referred to as the Internet Header Length (IHL) field, denotes the length of the IP header only. This is necessary because, as mentioned previously, the IP header can support options and, therefore, may vary in length.
IHL includes an offset to the data to make it fall on a 32-bit boundary value. The minimum value for IHL is 5, as defined in RFC 791; this produces a length of 5 * 32 = 160 bits, which equals 20 bytes. The IHL is a 4-bit field, so the maximum value it can represent is 16 - 1 = 15.
The maximum length for the IHL is 15 * 32 = 480 bits, or 60 bytes.
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