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

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In an 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

I had been asked this question during an interview for a job.

My enquiry is from IPV4 and IPV6 Comparision in chapter TCP/IP Protocol Suite of Computer Network

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Right answer is (c) TOS field

Best explanation: 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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