Which of the following functions is implemented using NDP 135/136 type messages?

Question

Options

• ADuplicate address detection
• BNeighbor status tracking
• CAddress resolution
• DRouter Discovery

• A
  79% (37)
• B
  9% (4)
• C
  11% (5)
• D
  2% (1)

Explanation

Duplicate Address Detection (DAD) is the process by which an IPv6 node verifies that a newly configured address is not already in use on the link. It does this by sending a Neighbor Solicitation (ICMPv6 type 135) with an unspecified source address (::) targeting the solicited-node multicast address of the candidate address; if any node responds with a Neighbor Advertisement (type 136), the address is a duplicate and cannot be used.

Router Discovery is wrong because it relies on Router Solicitation (type 133) and Router Advertisement (type 134), not 135/136. Neighbor status tracking, while related to Neighbor Unreachability Detection which does use NS/NA, is not a distinct NDP function tied specifically to these message types. Address resolution also uses Neighbor Solicitation and Advertisement, but it operates with a valid unicast source address rather than the unspecified address, making DAD the function most distinctively defined by the 135/136 pairing in exam contexts.

Memory tip: Think "135/136 = Neighbor Solicitation / Neighbor Advertisement" and remember that DAD is the odd one out -- it sends a Neighbor Solicitation from nobody (:: source) to check if someone else owns the address before claiming it.

No community discussion yet for this question.