350-501 Question #377: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. The network engineer is performing end-to-end MPLS path testing with these conditions: - Users must perform MPLS OAM for all available same-cost paths from R1 to R4. - Traceroute operations must return all of the next-hop IP details. Which configuration meets these requirements?

Options

• Atraceroute mpls ipv4 10.10.10.4 255.255.255.255 verbose
• Btraceroute mpls multipath ipv4 10.10.10.4 255.255.255.255
• Ctraceroute mpls multipath ipv4 10.10.10.4 255.255.255.255 verbose
• Dtraceroute mpls ipv4 10.10.10.4 255.255.255.255 source 10.10.10.1

Explanation

To perform MPLS OAM for all same-cost paths and retrieve detailed next-hop IP information, the traceroute mpls command must include both the multipath and verbose keywords.

Common mistakes.

• A. This command includes the verbose option for detailed output but lacks the multipath keyword, meaning it will only trace one path to the destination, not all available same-cost paths.
• B. This command includes the multipath option to discover all same-cost paths but omits the verbose keyword, which means it will not provide the required 'all of the next-hop IP details' in its output.
• D. This command specifies a source interface but lacks both the multipath keyword to find all same-cost paths and the verbose keyword for detailed next-hop information, thus failing to meet either of the specified requirements.

Concept tested. MPLS OAM traceroute options

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_pf_mpls_te_feat/configuration/15-mt/mp-pf-mpls-te-feat-15-mt-book/mp-te-tunnel-verify.html

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