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Exam 4A0-103 topic 4 question 29 discussion

Actual exam question from Alcatel-Lucent's 4A0-103
Question #: 29
Topic #: 4
[All 4A0-103 Questions]

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An LDP tunnel is established on router R1 towards router R6. The link between routers R2 and R4 goes down. What will happen to the MPLS data traffic to router
R6 IMMEDIATELY after the link goes down?

  • A. MPLS data traffic will be discarded until the IGP finds a new next-hop to router R3.
  • B. MPLS data traffic will be discarded unless the LDP tunnel has a standby secondary path.
  • C. MPLS data traffic will not be discarded because router R1 received labels from both next-hops, routers R2 and R3.
  • D. MPLS data traffic will not be discarded because of fast reroute capability on router R2.
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Suggested Answer: A 🗳️
by mynssen3 at Sept. 16, 2023, 1:20 p.m.

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mynssen3
1 year, 2 months ago
Selected Answer: A
The right answer is A. The secondary standby feature is only for RSVP, so LDP tunnels cannot be benefited with it. LDP is tightly dependent from IGP, so, until then igp protocol does not find another next-hop for the destination and establish a new path, the traffic will be discarted.
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