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Module 3: Network Layer & Routing

20222m

What is the maximum header size of an IP packet?

(i) 32 bytes
(ii) 64 bytes
(iii) 30 bytes
(iv) 60 bytes

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Answer

(iv) 60 bytes

Explanation

For IPv4, the base header is 20 bytes. The header length is specified by the IHL field in units of 32-bit words.

The IHL field is 4 bits, so its maximum value is 15 words.

Each word = 4 bytes.

Maximum header size:
15×4=6015 \times 4 = 60 bytes.

Therefore, the maximum IPv4 header size is 60 bytes.

Final answer: (iv) 60 bytes.

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