Question

Which of the following is not a step in the Header translation procedure?

(a) The IPv6 mapped address is changed to an IPv4 address by extracting the rightmost 32bits

(b) The value of the IPv6 priority field is discarded

(c) The type of service field in IPv4 is set to zero

(d) The IPv6 flow label is considered

Answer 1

The correct answer is (d) The IPv6 flow label is considered

For explanation: In the header translation procedure, first the IPv6 mapped address is changed to an IPv4 address by extracting the rightmost 32bits, then the value of the IPv6 priority field is discarded, and finally the ToS field in the IPv4 header is set to zero. IPv6 flow label is ignored in the procedure.