Which task is performed when troubleshooting LDP?

Question

Options

• AExecute the ping utility to generate information about the MAC addresses used along the path
• BVerify that MPLS is disabled globally and enabled on the necessary interfaces in a per-interface
• CExecute the traceroute utility to generate information about the labels used along the path
• DVerify that Cisco Express Forwarding has been disabled on the network

• A
  6% (2)
• B
  3% (1)
• C
  89% (32)
• D
  3% (1)

Explanation

When troubleshooting LDP (Label Distribution Protocol), the MPLS-aware traceroute utility (e.g., 'traceroute mpls ipv4 <prefix>') is used to trace the label-switched path hop by hop. Each intermediate router reports the incoming and outgoing labels it is using, allowing the engineer to verify that LDP has correctly distributed labels and that the label-switched path is intact end-to-end. Option A is incorrect because traceroute/ping in MPLS context reveals label information, not MAC addresses. Option B is incorrect because MPLS must be enabled globally and on the relevant interfaces - not disabled globally. Option D is incorrect because CEF must be enabled (not disabled) for MPLS forwarding to function; MPLS relies on CEF for its FIB-based label forwarding.

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