You are troubleshooting an LSP that is not carrying traffic as expected. You run 'show mpls lsp ingress' and see that the LSP is 'Up'. However, traffic is not being sent over the LSP. You check the routing table and see that the route to the destination is in the inet.0 table but not in the inet.3 table. What is the most likely reason for this?

The MPLS forwarding table is not populated correctly.

The LSP is not configured with a 'to' address that matches the destination.

The next-hop router for the destination is not an MPLS router.

The LSP is down, but the 'show mpls lsp ingress' command is showing stale information.

An MPLS network is experiencing intermittent packet loss on a specific LSP. You run 'show mpls lsp ingress' and see that the LSP is up. However, 'show mpls forwarding-table' on a transit router shows that the incoming label for this LSP is 100 and the outgoing label is 200, but the 'via' interface is listed as 'ge-0/0/0.0' which is down. What is the most likely cause of the packet loss?

The egress router has withdrawn its label binding, causing the transit router to use a stale entry.

The ingress router is not pushing the correct label, so the transit router is receiving an unexpected label.

The LSP is signaling correctly, but the forwarding table entry is stale because the interface went down after the LSP was established.

The label binding is incorrect, and the transit router is swapping to a label that the next hop does not recognize.

Juniper NetworksCertified Specialist, Service Provider Routing and Switching (JNCIS-SP)

Domain 7Objective 9

Configure, Monitor, or Troubleshoot MPLS Forwarding and LSPs JN0-364 Practice Questions (Page 2)

Part of the Multiprotocol Label Switching (MPLS) domain, which makes up ~16% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~6–10 in this domain), expect 1–1 from this objective — we provide 26 practice questions to prepare you well beyond it. (estimate)

26questions here

6free pages

8concepts

8 Concepts in This Objective

MPLS forwarding architecture
Label operations (push, swap, pop)
LSP establishment and signaling
LSP path selection and routing
MPLS forwarding table and label lookup
Monitoring MPLS forwarding and LSPs
Troubleshooting MPLS forwarding issues
Troubleshooting LSP issues

Questions 6–10

6expert · hard
You are troubleshooting an LSP that is not carrying traffic as expected. You run 'show mpls lsp ingress' and see that the LSP is 'Up'. However, traffic is not being sent over the LSP. You check the routing table and see that the route to the destination is in the inet.0 table but not in the inet.3 table. What is the most likely reason for this?
Select an answer first
7foundation · easy
Which Junos routing table stores MPLS label information for forwarding?
Select an answer first
8foundation · easy
Which signaling protocol is commonly used to establish MPLS LSPs with traffic engineering constraints?
Select an answer first
9expert · hard
An MPLS network is experiencing intermittent packet loss on a specific LSP. You run 'show mpls lsp ingress' and see that the LSP is up. However, 'show mpls forwarding-table' on a transit router shows that the incoming label for this LSP is 100 and the outgoing label is 200, but the 'via' interface is listed as 'ge-0/0/0.0' which is down. What is the most likely cause of the packet loss?
Select an answer first
10foundation · easy
What label operation does a transit LSR perform on an MPLS packet?
Select an answer first

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Configure, Monitor, or Troubleshoot MPLS Forwarding and LSPs JN0-364 Practice Questions (Page 2)

Questions 6–10

Which Junos routing table stores MPLS label information for forwarding?

Which signaling protocol is commonly used to establish MPLS LSPs with traffic engineering constraints?

What label operation does a transit LSR perform on an MPLS packet?

Keep studying — Multiprotocol Label Switching (MPLS)