The available answers are poorly worded, as all of A, B, and C are technically correct. However, Juniper devices differ from Cisco in LDP configuration.
B is correct AS LONG AS the two signaling endpoints are directly connected - then loopback is not required.
C is "more" correct because Juniper devices require loopback to be configured for LDP in all situations where the two LDP signaling endpoints are NOT directly connected, which will be the majority of cases.
A and B. Explanation:
Option A: The inet.3 table stores label-switched paths (LSPs) that are learned through LDP (Label Distribution Protocol). When using LDP, this table contains a full mesh of label-switched paths for all other LDP-enabled routers, allowing connectivity across the MPLS domain.
Option B: LDP is enabled on physical router interfaces to create LSPs. Once LDP is configured and enabled, the protocol exchanges labels with neighbors on these interfaces to establish LSPs.
Incorrect Options:
Option C: LDP is not typically enabled on the loopback interface, as LDP operates on physical interfaces and their adjacencies.
Option D: The inet.3 table does not store only explicitly defined paths; it dynamically includes LSPs for all reachable destinations that are LDP-enabled.
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