Question

Which two ICMPv6 types are used for testing IPv6 reachability? (Choose two.)

A) Echo Request (ping)

B) Router Advertisement (RA)

C) Neighbor Solicitation (NS)

D) Redirect

E) Destination Unreachable

Answer 1

In ICMPv6, the Echo Request (ping) and Destination Unreachable messages are used for testing IPv6 reachability.

Step-by-step explanation:

The two ICMPv6 types that are used for testing IPv6 reachability are:

• A) Echo Request (ping)
• E) Destination Unreachable

ICMPv6, which stands for Internet Control Message Protocol version 6, is a protocol used in IPv6 networks for error messaging and diagnostic utilities. The Echo Request is a message sent by a host to another host, it's essentially asking for a response to confirm that the target is available, this is the mechanism behind the ping tool. An Echo Reply is sent back if the target is reachable. Destination Unreachable messages are sent by routers or hosts to indicate that the target address is unreachable for some reason. These messages may include codes that provide additional information about why the destination is unreachable, like address unreachable, port unreachable, or communication with the destination administratively prohibited.