A network engineer is troubleshooting a BGP Layer 2 VPN issue. The customer reports that traffic between two sites is not being forwarded correctly. The engineer checks the MAC table on the PE router and sees that the MAC address of the customer's server at Site B is not present. What is the most likely cause?

The MAC address has aged out of the MAC table.

The MAC address is not being learned because the customer-facing interface is not associated with the routing instance.

The customer's server at Site B is not sending any traffic.

The BGP session between the PE routers is down.

A service provider has a BGP Layer 2 VPN connecting two customer sites. The customer sends a frame with an unknown destination MAC address from Site A. How will the PE router at Site A handle this frame?

Send the frame to the remote PE using the BGP next hop.

Drop the frame because the destination MAC address is unknown.

Flood the frame to all other interfaces in the l2vpn routing instance.

Look up the destination IP address in the routing table to determine the next hop.

A network engineer is configuring a BGP Layer 2 VPN on a PE router. The customer has two sites, each with a single VLAN. The engineer has created a routing instance of type l2vpn and has configured the BGP Layer 2 VPN. Which additional configuration is required to map the customer's traffic to the forwarding instance?

Configure a VRF target on the customer-facing interface.

Configure a static MAC address on the customer-facing interface.

Configure the customer-facing interface as an access interface and associate it with the routing instance.

Configure a BGP group for the customer-facing interface.

In a BGP Layer 2 VPN, how is a connection between two PEs mapped to a specific forwarding instance on a PE?

By using the VLAN ID of the customer frame to select the forwarding instance

By using the route target (RT) extended community to identify the Layer 2 VPN instance

By using the IP address of the remote PE to select the forwarding instance

By using the MPLS transport label to identify the forwarding instance

A service provider has a BGP Layer 2 VPN connecting two customer sites. The customer reports that traffic between the two sites is not being forwarded correctly. The engineer checks the PE router and sees that the MAC table for the l2vpn routing instance is empty. What is the most likely cause?

The BGP session between the PE routers is down.

The customer is not sending any traffic.

The routing instance is of type virtual-router instead of l2vpn.

The customer-facing interface is not associated with the l2vpn routing instance.

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

Domain 7Objective 1

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

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 10 practice questions to prepare you well beyond it. (estimate)

10questions here

2free pages

3concepts

Questions 6–10

6application · medium
A network engineer is troubleshooting a BGP Layer 2 VPN issue. The customer reports that traffic between two sites is not being forwarded correctly. The engineer checks the MAC table on the PE router and sees that the MAC address of the customer's server at Site B is not present. What is the most likely cause?
Select an answer first
7application · medium
A service provider has a BGP Layer 2 VPN connecting two customer sites. The customer sends a frame with an unknown destination MAC address from Site A. How will the PE router at Site A handle this frame?
Select an answer first
8application · medium
A network engineer is configuring a BGP Layer 2 VPN on a PE router. The customer has two sites, each with a single VLAN. The engineer has created a routing instance of type l2vpn and has configured the BGP Layer 2 VPN. Which additional configuration is required to map the customer's traffic to the forwarding instance?
Select an answer first
9foundation · easy
In a BGP Layer 2 VPN, how is a connection between two PEs mapped to a specific forwarding instance on a PE?
Select an answer first
10application · medium
A service provider has a BGP Layer 2 VPN connecting two customer sites. The customer reports that traffic between the two sites is not being forwarded correctly. The engineer checks the PE router and sees that the MAC table for the l2vpn routing instance is empty. What is the most likely cause?
Select an answer first

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

Questions 6–10

A service provider has a BGP Layer 2 VPN connecting two customer sites. The customer sends a frame with an unknown destination MAC address from Site A. How will the PE router at Site A handle this frame?

In a BGP Layer 2 VPN, how is a connection between two PEs mapped to a specific forwarding instance on a PE?

A service provider has a BGP Layer 2 VPN connecting two customer sites. The customer reports that traffic between the two sites is not being forwarded correctly. The engineer checks the PE router and sees that the MAC table for the l2vpn routing instance is empty. What is the most likely cause?

Keep studying — Layer 2 VPNs