COMPUTER NETWORKS AND COMMUNICATIONS
NETWORK TOPOLOGIES AND PROTOCOLS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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32 bits
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64 Bits
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16 Bits
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48 Bits
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Detailed explanation-1: -Length-A 4-bit field containing the length of the IP header in 32-bit increments. The minimum length of an IP header is 20 bytes, or five 32-bit increments. The maximum length of an IP header is 24 bytes, or six 32-bit increments.
Detailed explanation-2: -As we discussed in Chapter 2, most IP packets have a 20-byte header, with a maximum of 60 bytes being used for this data. TCP segments also have their own header information, with a minimum value of 20 bytes (the most common), and a maximum size of 60 bytes.
Detailed explanation-3: -Because this is a 16-bit field, the maximum size of an IPv4 datagram (including header) is 65, 535 bytes.
Detailed explanation-4: -The minimum length of an IP header is 20 bytes so with 32 bit increments, you would see value of 5 here. The maximum value we can create with 4 bits is 15 so with 32 bit increments, that would be a header length of 60 bytes. This field is also called the Internet Header Length (IHL).
Detailed explanation-5: -The IHL field contains the size of the IPv4 header; it has 4 bits that specify the number of 32-bit words in the header.