MPLS and Routing Tables JN0-364 Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   In an MPLS router, what is the primary purpose of the MPLS forwarding table?

   • ATo maintain the state of all MPLS LSPs in the network
   • BTo store the configuration of all MPLS interfaces
   • CTo store all IP routes learned from routing protocols
   • DTo map incoming labels to outgoing labels, next hops, and outgoing interfaces
   Reveal Solution Discussion Select an answer first
2. 12application · medium

   You are configuring an MPLS network and need to ensure that the MPLS forwarding table is correctly populated. You notice that the next-hop resolution for an MPLS label entry is failing. Which component is primarily responsible for providing the underlying IP path that MPLS uses to resolve its next hops?

   • AThe routing table, which contains the IGP-learned routes that MPLS uses to determine the next hop for a label.
   • BThe MPLS label information base, which stores all label bindings received from LDP.
   • CThe BGP table, which contains the VPN routes that are used to populate the VRF.
   • DThe ARP table, which provides the MAC address for the next-hop IP address.
   Reveal Solution Discussion Select an answer first
4. 13expert · hard

   You are analyzing the MPLS forwarding table on a router and see an entry with an incoming label of 100 and an outgoing label of 200. You also see a separate entry with an incoming label of 200 and an outgoing label of 300. What can you conclude about the router's role in the LSP?

   • AThe router is the penultimate hop for the LSP that uses label 100 and the ingress router for the LSP that uses label 200.
   • BThe router is the ingress router for the LSP that uses label 100 and the egress router for the LSP that uses label 200.
   • CThe router is performing a pop operation on label 100 and a push operation on label 200.
   • DThe router is a transit router that is swapping label 100 to label 200 for one LSP and label 200 to label 300 for another LSP.
   Reveal Solution Discussion Select an answer first
5. 14expert · hard

   You are troubleshooting an MPLS network where a transit router is not forwarding labeled packets correctly. You notice that the routing table has a route to the destination, but the MPLS forwarding table does not have a label entry for that destination. What is the most likely cause of this issue?

   • AThe routing table entry is a BGP route, and MPLS does not use BGP routes for label forwarding.
   • BThe destination prefix is not in the BGP table, so the MPLS forwarding entry cannot be created.
   • CLDP has not distributed a label binding for the destination prefix, so the MPLS forwarding entry cannot be created.
   • DThe transit router is not configured with MPLS enabled on the incoming interface.
   Reveal Solution Discussion Select an answer first
6. 15expert · hard

   You are designing an MPLS network for a service provider that needs to support multiple VPNs. You need to ensure that the LSPs are established correctly and that packets are forwarded based on labels. Which statement correctly describes the relationship between LSPs and VPNs in this context?

   • AVPNs do not use LSPs; they use IP forwarding based on the VRF.
   • BAll VPNs share a single LSP, and the VPN label is used to identify the VPN within the LSP.
   • CEach VPN has its own LSP, and the VPN label is used to identify the VPN within the LSP.
   • DThe LSP is established per VPN, and the transport label is the VPN label.
   Reveal Solution Discussion Select an answer first