LDP Layer 2 Circuits and Virtual Circuit Labels JN0-664 Practice Questions (Page 3)

Questions 11–15

1. 11application · medium

   You are troubleshooting an LDP Layer 2 circuit. The show l2circuit connections output shows the circuit is up, but you notice that the 'Remote label' field is empty. What does this indicate?

   • AThe remote PE has not advertised a virtual circuit label.
   • BThe local PE has not advertised a virtual circuit label.
   • CThe virtual circuit ID is incorrect.
   • DThe transport LSP is down.
   Reveal Solution Discussion Select an answer first
2. 12foundation · easy

   In a service provider network, what is the primary purpose of an LDP-based Layer 2 circuit?

   • ATo route IP packets between provider edge routers using LDP as the IGP
   • BTo transport Layer 2 frames between two customer edge devices across an MPLS backbone
   • CTo segment a broadcast domain into multiple isolated VLANs on a single physical link
   • DTo provide a Layer 3 VPN service by exchanging VPN routes via BGP
   Reveal Solution Discussion Select an answer first
4. 13application · medium

   You are configuring an LDP Layer 2 circuit on a Juniper PE. The customer requires that the service be transparent to VLAN tags. You have configured the logical interface with encapsulation ethernet and family l2circuit. What else must you configure to ensure the circuit is established?

   • AAn MPLS LSP to the remote PE using RSVP.
   • BA VPLS instance with the same virtual circuit ID.
   • CAn l2circuit neighbor statement with the remote PE address and a virtual circuit ID.
   • DA routing instance of type l2circuit.
   Reveal Solution Discussion Select an answer first
5. 14expert · hard

   You are troubleshooting an LDP Layer 2 circuit. The show l2circuit connections output shows the circuit is down. You check the LDP session and it is up. You check the transport LSP and it is up. What is the most likely next step to diagnose the issue?

   • ACheck the configuration of the local interface and the virtual circuit ID on both PEs.
   • BCheck the MPLS label-switching table for the transport label.
   • CCheck the routing table for a route to the remote PE.
   • DCheck the LDP session parameters for the neighbor.
   Reveal Solution Discussion Select an answer first
6. 15application · medium

   You are verifying an LDP Layer 2 circuit. The show l2circuit connections output shows the circuit is up. Which statement about the virtual circuit label is true?

   • AThe virtual circuit label is the same as the transport label.
   • BThe virtual circuit label is assigned by the remote PE and sent to the local PE.
   • CThe local PE uses the same label for both directions of the circuit.
   • DThe local PE advertises a label to the remote PE, and the remote PE uses it as the inner label for frames sent to the local PE.
   Reveal Solution Discussion Select an answer first