BGP Layer 2 VPN Traffic Flow, Forwarding Tables, and Connection Mapping JN0-664 Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   In a BGP Layer 2 VPN, what information is stored in the MAC table of a PE router?

   • AVLAN IDs and their associated bridge domain names
   • BMAC addresses and the associated egress interface or remote PE and label information
   • CIP addresses and their associated VPN labels
   • DMPLS labels and their corresponding next-hop IP addresses
   Reveal Solution Discussion Select an answer first
2. 2foundation · easy

   In a BGP Layer 2 VPN, what determines which local interface is used to forward traffic to a CE for a given forwarding instance?

   • AThe interface is selected dynamically based on the destination MAC address.
   • BThe interface is selected based on the route target of the received route.
   • CThe interface is explicitly bound to the Layer 2 VPN routing instance in the PE configuration.
   • DThe interface is chosen based on the MPLS label received from the remote PE.
   Reveal Solution Discussion Select an answer first
4. 3foundation · easy

   What is the primary role of the forwarding table in a BGP Layer 2 VPN PE?

   • ATo map VPN labels to the corresponding Layer 2 VPN instance and forwarding interface
   • BTo maintain a list of all MAC addresses in the entire service provider network
   • CTo store the MPLS transport labels for all P routers in the core
   • DTo store IP routes learned from the CE and advertise them to other PEs
   Reveal Solution Discussion Select an answer first
5. 4foundation · easy

   When a BGP Layer 2 VPN frame arrives at the egress PE from the MPLS core, what is the final processing step before the frame is sent to the CE?

   • AThe PE floods the frame out all interfaces in the Layer 2 VPN instance, including the core-facing interface.
   • BThe PE strips the Ethernet header and sends the payload to the CE as a raw IP packet.
   • CThe PE performs an IP route lookup on the payload and forwards the packet based on the destination IP address.
   • DThe PE pops the transport label, uses the VPN label to identify the correct Layer 2 VPN instance, and forwards the original Ethernet frame out the matching interface.
   Reveal Solution Discussion Select an answer first
6. 5foundation · easy

   In a BGP Layer 2 VPN, when a frame arrives at the ingress PE from a customer edge (CE) device, what is the first processing step before the frame is forwarded across the MPLS core?

   • AThe frame is immediately flooded out all interfaces in the Layer 2 VPN, including the MPLS core.
   • BThe frame is encapsulated in an MPLS label stack and sent directly to the remote PE.
   • CThe frame is looked up in the MAC table of the associated Layer 2 VPN routing instance to determine the outgoing interface and label stack.
   • DThe frame is stripped of its Ethernet header and the payload is forwarded using IP routing.
   Reveal Solution Discussion Select an answer first