Which two statements about IPv6 path MTU discovery are true? (Choose two.)
A.
If the destination host receives an ICMPv6 Packet Too Big message from a router, it
reduces its path MTU.
B.
It can allow fragmentation when the minimum MTU is below a configured value.
C.
The discovery packets are dropped if there is congestion on the link.
D.
If the source host receives an ICMPv6 Packet Too Big message from a router, it
reduces its path MTU.
E.
During the discovery process, the DF bit is set to 1.
F.
The initial path MTU is the same as the MTU of the original node’s link layer interface.
Explanation:
IPv6 routers do not support fragmentation or the Don’t Fragment option. For IPv6, Path
MTU Discovery works by initially assuming the path MTU is the same as the MTU on the
link layer interface where the traffic originates. Then, similar to IPv4, any device along
the path whose MTU is smaller than the packet will drop the packet and send back an
ICMPv6 Packet Too Big (Type 2) message containing its MTU, allowing the source host to
reduce its Path MTU appropriately. The process is repeated until the MTU is small
enough to traverse the entire path without fragmentation.
https://en.wikipedia.org/wiki/Path_MTU_Discovery