The Total Length field in the IPv4 header specifies what?

Study for the Internet Protocol Version 4 Test. Use flashcards and multiple-choice questions, each with hints and explanations. Master the exam with confidence!

Multiple Choice

The Total Length field in the IPv4 header specifies what?

Explanation:
The Total Length field specifies the entire IPv4 packet length in bytes, from the start of the IP header to the end of the payload. It’s a 16-bit value, so the maximum size is 65,535 bytes. The header length itself is determined by the IHL (Internet Header Length) field, which tells you how many 32-bit words make up the header; this is independent from the Total Length. To find the payload size, you subtract the header length (IHL in bytes, i.e., IHL × 4) from the Total Length. In fragmentation, each fragment has its own Total Length that covers its own header plus its fragment data.

The Total Length field specifies the entire IPv4 packet length in bytes, from the start of the IP header to the end of the payload. It’s a 16-bit value, so the maximum size is 65,535 bytes. The header length itself is determined by the IHL (Internet Header Length) field, which tells you how many 32-bit words make up the header; this is independent from the Total Length. To find the payload size, you subtract the header length (IHL in bytes, i.e., IHL × 4) from the Total Length. In fragmentation, each fragment has its own Total Length that covers its own header plus its fragment data.

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