In the quiz 2017 question 4, the right answer is that UDP and TCP are the same with IPv6 and IPv4. I understand why this is the case when looking at the protocol design, but in the implementation, TCP segments have different lengths in IPv4 and IPv6 (slide 42).
Could we have said that TCP is not the same with IPv4 and IPv6 ?
Hi,
the protocol (the P of TCP and UDP), that is the specifications of the TCP/UDP header, inter-operability behavior, etc.. is the same irrespective of the lower layer protocol, which of course is one of the main objectives of layered architectures.
The way an endpoint operates the protocol (decision where to split the segments, which size to use depending on the lower-layer protocol) is left to implementation (the devil is in the 'by default' of slide 42) and is hence not considered as being part of the protocol.
Cheers,
Ludovic
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