NETWORK LAYER
INTRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Yes
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No
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Either A or B
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None of the above
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Detailed explanation-1: -The IPv6 protocol does not use header checksums. Its designers considered that the whole-packet link layer checksumming provided in protocols, such as PPP and Ethernet, combined with the use of checksums in upper layer protocols such as TCP and UDP, are sufficient.
Detailed explanation-2: -UDP checksum, which was optional in IPv4, is mandatory in IPv6. Therefore, the checksum at Layer 3 is redundant, so the Header Checksum field is unnecessary in IPv6 and suppresses the recomputation process each time a packet passes through a router.
Detailed explanation-3: -The fixed header contains the mandatory essential information about the packet while the optional headers contain the optional “not that necessary” information.