Nov2017 cs Q30 Multiple Choice Questions

Option : D
Explanation :
The fragmentation fields in the base header section of IPv4 have moved to the fragmentation extension header in IPv6:

So, given statement is correct. Authentication header (protocol 51) is identical in both IPv4 and IPv6, but authentication extension header is new in IPv6. So, given statement is correct. In the IPv6 specifications [IPv6], no record route function is defined, and the record route function for IPv4 is less flexible and has scalability problems. So, given statement is correct. Although, RR6 (Record Route for IPv6) mechanism is redesigned to establish an optimized record route mechanism for IPv6 and fix the problems of the record route function for IPv4 using Hop-by-Hop Option Extension. Hence, option (D) is correct.