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Header of datagram in IPv4 has _________

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Header of datagram in IPv4 has _________

(a) 0 to 20 bytes

(b) 20 to 40 bytes

(c) 20 to 60 bytes

(d) 20 to 80 bytes

I got this question in homework.

My query is from Network Protocols topic in portion Network Protocol of Wireless/Mobile

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Right option is (c) 20 to 60 bytes

Explanation: IP header length is a minimum of 20 bytes and a maximum of 60 bytes. The minimum value for this field is 5, which is a length of 5×32 = 160 bits = 20 bytes. Being a 4-bit value, the maximum length is 15 words (15×32 bits) or 480 bits = 60 bytes.

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