You have just configured IPv6 in your network. A packet arrives on your router that exceeds the MTU size. How will an IPv6 router respond?
A.
The fragment offset is referenced and the packet is fragmented.
B.
The packet is kept intact and not fragmented.
C.
The packet is dropped.
D.
The packet is fragmented based on extension headers.
I think D is correct.
A packet whose size exceeds the next-hop MTU will be discarded
and cause an ICMPv6 PTB to be sent.
C is correct
Why C?
extension headers talks about
Fragment 44 Contains parameters for fragmentation of datagrams.
I think D is correct.
The packet is fragmented based on extension headers.
Only a host can fragment an ipv6 packet, Not a router.
The IPv4 router will fragment and forward the packet, but also send back to the source an ICMP “packet too big” error message to inform the source that it should use a smaller MTU size. IPv6 routers do not fragment the packet on behalf of the source and just drop the packet and send back the ICMPv6 error message.