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In the IPv6 header, the traffic class field is similar to which field in the IPv4 header?

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In the IPv6 header, the traffic class field is similar to which field in the IPv4 header?

(a) Fragmentation field

(b) Fast-switching

(c) ToS field

(d) Option field

The question was asked in an internship interview.

This key question is from IPv6 topic in chapter TCP/IP Protocol Suite of Computer Network

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Correct option is (c) ToS field

To explain: The traffic class field is used to specify the priority of the IP packet which is a similar functionality to the Type of Service field in the IPv4 header. It’s an 8-bit field and its values are not defined in the RFC 2460.

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