An engineer needs to improve MPLS network management by implementing a set of tools to support the NOC engineers in troubleshooting network failures. Which feature should the engineer implement to…

Question

Options

• AMPLS OAM
• BMPLS-TP
• CLDP autodiscovery
• Dextended ping

• A
  76% (25)
• B
  3% (1)
• C
  15% (5)
• D
  6% (2)

Explanation

MPLS OAM (Operations, Administration, and Maintenance) is correct because it provides the specific toolset designed to verify MPLS LSP connectivity, including LSP ping and LSP traceroute (RFC 8029). These tools test the actual label-switched forwarding path between ingress and egress PE routers - not just IP reachability - making them purpose-built for exactly this NOC troubleshooting scenario.

Why the others are wrong:

• B (MPLS-TP): A transport-profile variant of MPLS for carrier/packet-transport networks; it has its own OAM, but it's an architectural profile, not a general LSP verification tool.
• C (LDP autodiscovery): Used to automatically discover LDP neighbors (especially for L2 VPN setups); it's about session establishment, not LSP health verification.
• D (Extended ping): Tests IP-layer reachability, not the MPLS forwarding plane itself; it can't confirm that traffic is actually following the label-switched path end-to-end.

Memory tip: The acronym gives it away - "OAM" stands for Operations, Administration, and Maintenance. Any exam question asking about managing, monitoring, or troubleshooting an MPLS network should immediately trigger "OAM."

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