What is the size of the IP ID field in IPv4?

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Multiple Choice

What is the size of the IP ID field in IPv4?

Explanation:
The IP Identification field in IPv4 is 16 bits long, which means it is a 2-byte value. This field labels fragments that belong to the same original datagram so they can be reassembled correctly at the destination. With 16 bits, it can take values from 0 to 65,535, matching the 2-byte size. That makes the 2-byte option the correct fit. The other sizes don't align with the actual field length: 1 byte would offer only 0–255, which is too small for fragment tagging; 3 bytes would be 0–16,777,215, and 4 bytes would be 0–4,294,967,295, both larger than the IPv4 IP ID field as defined.

The IP Identification field in IPv4 is 16 bits long, which means it is a 2-byte value. This field labels fragments that belong to the same original datagram so they can be reassembled correctly at the destination. With 16 bits, it can take values from 0 to 65,535, matching the 2-byte size. That makes the 2-byte option the correct fit. The other sizes don't align with the actual field length: 1 byte would offer only 0–255, which is too small for fragment tagging; 3 bytes would be 0–16,777,215, and 4 bytes would be 0–4,294,967,295, both larger than the IPv4 IP ID field as defined.

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