Which method and multicast group does LDP use to discover neighbors on an IPv4 network?
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Correct answer: Multicast hellos are sent to the 224.0.0.2 group address..
Why this is the answer
LDP (Label Distribution Protocol) uses multicast hellos sent to the 224.0.0.2 group address to discover neighbors on an IPv4 network. This is the all-routers multicast address, allowing LDP-enabled interfaces to discover other LDP-enabled routers on the same segment without prior configuration. Broadcasts (255.255.255.255) are not used by LDP for neighbor discovery. Unicast hellos are not used for initial discovery; they are used for targeted LDP sessions. The 224.0.0.5 group address is used by OSPF for DR/BDR election, not LDP neighbor discovery.
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