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350-501 Services Practice Question

Exhibit

Refer to the exhibit.
! Output from show mpls forwarding-table
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop
Label      Label      or Tunnel Id     Switched      interface
16         Pop       10.1.1.0/24      0             Gi0/0/0    192.168.1.2
17         20         10.2.2.0/24      1000          Gi0/0/0    192.168.1.2
18         Untagged   10.3.3.0/24      500           Gi0/0/0    192.168.1.2
19         22         10.4.4.0/24      2000          Gi0/0/0    192.168.1.2

Refer to the exhibit. Which statement is true regarding the forwarding entry for 10.2.2.0/24?

⚠ Common exam trap

Cisco often tests the distinction between the incoming label (local label) and the outgoing label in the forwarding table, and the trap here is that candidates confuse the local label (which is the label this router assigns for the FEC) with the incoming label shown in the forwarding entry, leading them to incorrectly select option D.

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

This entry uses explicit label request (not PHP).

The forwarding entry for 10.2.2.0/24 shows an outgoing label of 20, which means the egress LSR is not performing penultimate hop popping (PHP). In MPLS, when the outgoing label is not the implicit-null label (3) or explicit-null label (0), the penultimate hop must push that label, and the egress LSR will perform a full label lookup. This is an explicit label request, not PHP.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✓

    This entry uses explicit label request (not PHP).

    Why this is correct

    Outgoing label 20 means next hop expects that label, not pop.

  • ✗

    The outgoing interface uses penultimate hop popping.

    Why it's wrong here

    PHP would show Pop as outgoing label.

  • ✗

    The outgoing label is Untagged.

    Why it's wrong here

    Untagged is for a different prefix.

  • ✗

    The local label is 20.

    Why it's wrong here

    Local label is 17.

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JA

Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.