What is the purpose of label stacking in inter-AS MPLS?

To allow multiple labels to be carried so that the outer label can be swapped at AS boundaries while the inner label remains intact

To reduce the number of labels needed in the network

To replace BGP with LDP for inter-AS label distribution

To eliminate the need for MPLS in the core network

A service provider is migrating a core router from an older IOS to a newer IOS-XR. The router runs OSPF as the IGP and LDP for label distribution. During a maintenance window, the engineer notices that LDP sessions to a neighboring router are flapping. The IGP converges quickly, but the engineer is concerned about traffic being dropped because MPLS labels are not available for some prefixes. The engineer wants to ensure that the IGP does not advertise routes through the flapping link until LDP is fully operational. Which configuration should the engineer apply on the core router?

Configure LDP session protection on the OSPF interface.

Increase the LDP session hold time to 120 seconds.

Set the LDP transport address to the loopback interface.

Enable LDP-IGP synchronization under the OSPF process.

CiscoCertified Network Professional Service Provider

Domain 3Objective 1

3.1 Implement MPLS 350-501 Practice Questions (Page 1)

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 1–5

1foundation · easy
What is the purpose of label stacking in inter-AS MPLS?
Select an answer first
2application · medium
A service provider is migrating a core router from an older IOS to a newer IOS-XR. The router runs OSPF as the IGP and LDP for label distribution. During a maintenance window, the engineer notices that LDP sessions to a neighboring router are flapping. The IGP converges quickly, but the engineer is concerned about traffic being dropped because MPLS labels are not available for some prefixes. The engineer wants to ensure that the IGP does not advertise routes through the flapping link until LDP is fully operational. Which configuration should the engineer apply on the core router?
Select an answer first
3application · medium
A service provider uses AToM to transport Layer 2 frames over MPLS. The provider wants to verify that the pseudowire is operational and that the control channel is functioning. Which OAM mechanism should be used?
Select an answer first
4foundation · easy
Which MPLS OAM tool is used to localize a failure along an LSP by discovering the path and identifying the faulty hop?
Select an answer first
5foundation · easy
Which MPLS OAM mechanism is used to verify the connectivity of an AToM pseudowire?
Select an answer first

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3.1 Implement MPLS 350-501 Practice Questions (Page 1)

Questions 1–5

What is the purpose of label stacking in inter-AS MPLS?

A service provider uses AToM to transport Layer 2 frames over MPLS. The provider wants to verify that the pseudowire is operational and that the control channel is functioning. Which OAM mechanism should be used?

Which MPLS OAM tool is used to localize a failure along an LSP by discovering the path and identifying the faulty hop?

Which MPLS OAM mechanism is used to verify the connectivity of an AToM pseudowire?

Keep studying — MPLS and Segment Routing