What is the role of neighbor solicitation (NS) messages in the autoconfiguration of an IPv6 address?

Question

Options

• AAn IPv6 node sends an NS message to inform a node undergoing autoconfiguration that it is already
• BAn IPv6 node sends an NS message for its tentative address to determine whether another node is
• CAn IPv6 node sends an NS message for the global prefix to prompt other IPv6 nodes to advertise the
• DAn IPv6 node sends an NS message to prompt an IPv6 router on the link to advertise the global prefixes

• A
  8% (5)
• B
  70% (42)
• C
  18% (11)
• D
  3% (2)

Explanation

Duplicate Address Detection When a host first joins a link, it multicasts neighbor solicitations for its own IPv6 address for a short period before attempting to use that address to communicate. If it receives a neighbor advertisement in response, the host realizes that another neighbor on the link is already using that address. The host will mark the address as a duplicate and will not use it on the link. Note that this process is similar to IPv4 gratuitous ARP requests, but NDP elegantly allows for detection of two hosts with the same address before both hosts are actively sending traffic from Note: Address Resolution The function of address resolution was handled by ARP for IPv4, but is handled by ICMPv6 for IPv6. In a process very similar to router discovery, two ICMPv6 messages are used: Neighbor Solicitation (type 135) and Neighbor Advertisement (type 136). A host seeking the link layer address of a neighbor multicasts a neighbor solicitation and the neighbor (if online) responds with its link layer address in a neighbor advertisement.

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