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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

Why: The IPv4 header length field (IHL) is 4 bits, giving 24−1=152^4 - 1 = 15 words of 4 bytes = 15×4=6015 \times 4 = 60 bytes total header, i.e. a maximum header size of 60 bytes (the minimum is 20 bytes with no options). 32/64/30 bytes do not correspond to any IHL-derived value; 64 would be the header limit only under protocols like IPv6's usual 40-byte base + extensions pattern.

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