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Exam 400-101 topic 1 question 197 discussion

Actual exam question from Cisco's 400-101
Question #: 197
Topic #: 1
[All 400-101 Questions]

Which neighbor-discovery message type is used to verify connectivity to a neighbor when the link- layer address of the neighbor is known?

  • A. neighbor solicitation
  • B. neighbor advertisement
  • C. router advertisement
  • D. router solicitation
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Suggested Answer: A 🗳️
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
"Pass Any Exam. Any Time." - www.actualtests.com 208

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
by [deleted] at April 3, 2025, 6:20 p.m.

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