MPLS CCIE-ENTERPRISE-INFRASTRUCTURE Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   Which command verifies the VPNv4 routes learned via MP-BGP on a PE router?

   • Ashow ip bgp vpnv4 all
   • Bshow ip route vrf <name>
   • Cshow mpls forwarding-table
   • Dshow mpls ldp neighbor
   Reveal Solution Discussion Select an answer first
2. 7foundation · easy

   In MPLS forwarding, what does a router do when it receives a labeled packet?

   • AIt removes all labels and routes the packet using IP routing
   • BIt swaps the incoming label with an outgoing label and forwards the packet
   • CIt encapsulates the packet in a new IP header
   • DIt performs a longest-prefix match on the destination IP address
   Reveal Solution Discussion Select an answer first
4. 8foundation · easy

   What is the purpose of penultimate hop popping (PHP) in MPLS?

   • ATo add an extra label at the penultimate router to ensure correct forwarding
   • BTo perform a routing lookup at the penultimate router
   • CTo encapsulate the packet in a new MPLS label stack
   • DTo reduce the size of the MPLS label stack by removing the outer label at the penultimate router
   Reveal Solution Discussion Select an answer first
5. 9foundation · easy

   In MPLS label stacking, what does the 'outer' label typically represent?

   • AThe VPN identifier
   • BThe label-switched path (LSP) to the egress router
   • CThe next-hop IP address
   • DThe customer's MAC address
   Reveal Solution Discussion Select an answer first
6. 10foundation · easy

   In an MPLS L3VPN architecture, what is the role of a Provider Edge (PE) router?

   • ATo forward MPLS packets in the core without knowing VPN details
   • BTo act as a firewall between VPNs
   • CTo provide routing within the customer's network
   • DTo connect customer sites to the MPLS backbone and maintain VPN routing information
   Reveal Solution Discussion Select an answer first