A service provider has two PE routers connected over a direct link. The LDP session between them is established using basic discovery (multicast hello). The provider wants to ensure that if the direct link fails, the LDP session remains up using an alternate path, so that label bindings are not lost and MPLS traffic can be rerouted quickly. Which configuration should be applied?

Increase the LDP hello hold time on the interface.

Enable LDP session protection on both routers.

Configure LDP-IGP synchronization on the interface.

Set the LDP session hold time to 0.

How does LDP-IGP synchronization prevent traffic loss when an LDP session on a link fails?

It delays the IGP convergence until LDP has re-established the session

It keeps the IGP adjacency up but stops advertising the link's labels to neighbors

It automatically switches all traffic to RSVP-TE tunnels until LDP recovers

It immediately tears down the IGP adjacency so that the IGP reroutes around the link

Which technique is used in inter-AS MPLS to carry labels across autonomous system boundaries?

RSVP-TE with inter-AS extensions

What is the primary goal of Unified MPLS?

To replace MPLS with Segment Routing in all networks

To combine MPLS and ATM into a single transport technology

To provide seamless end-to-end MPLS transport across multiple domains or service provider networks

To eliminate the need for BGP in service provider networks

What is the purpose of the loopback (echo reply) mechanism in MPLS OAM?

To allow a router to send an echo reply back to the originator to verify LSP connectivity

To prevent routing loops in MPLS networks

To automatically reroute traffic around a failed link

To force all traffic to be sent back to the originator for security analysis

CiscoCertified Network Professional Service Provider

Domain 3Objective 1

3.1 Implement MPLS 350-501 Practice Questions (Page 3)

Part of the MPLS and Segment Routing domain, which accounts for 20% of the 350-501 exam. Cisco does not publish an official question count, but from its 120-minute exam (~50–80 total, ~10–16 in this domain), expect 3–5 from this objective — we provide 25 practice questions to prepare you well beyond it. (estimate)

25questions here

5free pages

8concepts

20%of the exam

Questions 11–15

11application · medium
A service provider has two PE routers connected over a direct link. The LDP session between them is established using basic discovery (multicast hello). The provider wants to ensure that if the direct link fails, the LDP session remains up using an alternate path, so that label bindings are not lost and MPLS traffic can be rerouted quickly. Which configuration should be applied?
Select an answer first
12foundation · easy
How does LDP-IGP synchronization prevent traffic loss when an LDP session on a link fails?
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13foundation · easy
Which technique is used in inter-AS MPLS to carry labels across autonomous system boundaries?
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14foundation · easy
What is the primary goal of Unified MPLS?
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15foundation · easy
What is the purpose of the loopback (echo reply) mechanism in MPLS OAM?
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