You are troubleshooting an LDP Layer 2 circuit. The show l2circuit connections output shows the circuit is down with the status 'Stale'. Which of the following is the most likely cause?

The remote PE has withdrawn the virtual circuit label.

The local interface is administratively down.

You are verifying an LDP Layer 2 circuit. The show l2circuit connections output shows the circuit is up, but the 'Local interface' is listed as 'ge-0/0/1.0'. Which statement about the virtual circuit label is true?

The remote PE assigns a label for the local interface and sends it to the local PE.

The virtual circuit label is derived from the interface index.

The local PE assigns a label from the MPLS label space and advertises it to the remote PE via LDP.

The virtual circuit label is the same as the transport label.

What is the purpose of the LDP keepalive message in the context of Layer 2 circuits?

To maintain the LDP session between the provider edge routers

To synchronize the clock between the provider edge routers

To verify the integrity of the Layer 2 frames being transported

To periodically refresh the virtual circuit label

How is the virtual circuit label for an LDP Layer 2 circuit assigned?

It is derived from the MPLS transport label using a hash algorithm

It is statically configured on both provider edge routers

It is assigned by the customer edge router and passed to the provider edge router via the attachment circuit

It is dynamically allocated by the egress provider edge router and advertised to the ingress PE via LDP

Juniper NetworksCertified Professional, Service Provider Routing and Switching (JNCIP-SP)

Domain 7Objective 3

LDP Layer 2 Circuits and Virtual Circuit Labels JN0-664 Practice Questions (Page 1)

Part of the Layer 2 VPNs 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 20 practice questions to prepare you well beyond it. (estimate)

20questions here

4free pages

5concepts

Questions 1–5

1expert · hard
You are troubleshooting an LDP Layer 2 circuit. The show l2circuit connections output shows the circuit is down with the status 'Stale'. Which of the following is the most likely cause?
Select an answer first
2application · medium
You are verifying an LDP Layer 2 circuit. The show l2circuit connections output shows the circuit is up, but the 'Local interface' is listed as 'ge-0/0/1.0'. Which statement about the virtual circuit label is true?
Select an answer first
3foundation · easy
What is the purpose of the LDP keepalive message in the context of Layer 2 circuits?
Select an answer first
4foundation · easy
How is the virtual circuit label for an LDP Layer 2 circuit assigned?
Select an answer first
5foundation · easy
Which LDP message type is used to establish an LDP Layer 2 circuit?
Select an answer first

Finished these 5 questions?

Review the revealed explanations, or continue through the curriculum.

Next 5 questions →Back to JN0-664

Free Basic Practice is a study aid with revealable answers — not a scored exam. Examers.io is independent and not affiliated with or endorsed by Juniper Networks. “JN0-664” is a trademark of its owner, used for identification only.