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Which neighbor-discovery message type is used to verify connectivity to a neighbor when the link- layer address of the neighbor is known?
Correct Answer: A
Explanation/Reference: Explanation: IPv6 Neighbor Solicitation Message A value of 135 in the Type field of the ICMP packet header identifies a neighbor solicitation message. Neighbor solicitation messages are sent on the local link when a node wants to determine the link-layer address of another node on the same local link (see the figure below). When a node wants to determine the link-layer address of another node, the source address in a neighbor solicitation message is the IPv6 address of the node sending the neighbor solicitation message. The destination address in the neighbor solicitation message is the solicited-node multicast address that corresponds to the IPv6 address of the destination node. The neighbor solicitation message also includes the link-layer address of the source node. Figure 1. IPv6 Neighbor Discovery: Neighbor Solicitation Message Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_basic/configuration/xe-3s/ip6b- xe-3s- book/ip6-neighb-disc-xe.html