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The header length of an IPv6 datagram is ___________

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The header length of an IPv6 datagram is ___________

(a) 10bytes

(b) 25bytes

(c) 30bytes

(d) 40bytes

I got this question during an online exam.

I would like to ask this question from IPV4 and IPV6 Comparision topic in chapter TCP/IP Protocol Suite of Computer Network

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The correct option is (d) 40bytes

Best explanation: IPv6 datagram has fixed header length of 40bytes, which results in faster processing of the datagram. There is one fixed header and optional headers which may or may not exist. The fixed header contains the mandatory essential information about the packet while the optional headers contain the optional “not that necessary” information.

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