Final answer:
The two ICMPv6 types used for neighbor discovery are Router Advertisement and Neighbor Solicitation, which are essential for routing presence advertisement and for determining the link-layer address of a neighbor, respectively.
Step-by-step explanation:
The two ICMPv6 types used for neighbor discovery are:
- A) Router Advertisement
- C) Neighbor Solicitation
Router Advertisement (Type 134) is used by routers to advertise their presence along with various link and Internet Protocol (IP) parameters to connected hosts. It can inform a host of better routes or indicate that a router cannot forward packets.
On the other hand, Neighbor Solicitation (Type 135) is used by nodes to determine the link-layer address of a neighbor, or to verify that a neighbor is still reachable via a cached link-layer address. It is part of address resolution and neighbor unreachability detection.
The correct question is: Which two ICMPv6 types are used for neighbor discovery? (Choose two.)
A) Router Advertisement
B) ICMPv6 Echo Request
C) Neighbor Solicitation
D) ICMPv6 Redirect