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MPLS VPN Questions 2

Here you will find answers to MPLS VPN Questions – Part 2

Question 1

When configuring Internet access from a MPLS VPN using a separate subinterface, which two configurations are required on the PE router? (Choose two)

A. Use the ip vrf forwarding command on the subinterface that is used for MPLS VPN access.
B. Use the ip vrf forwarding command on the subinterface that is used for Internet access.
C. The CE router is configured as a BGP neighbor in both the global BGP process and inside the VPN in the VRF.
D. The PE-to-CE VPN and Internet routing are configured using two separate address-family ipv4 vrf commands, one for VPN routing and one for Internet routing.


Answer: A C

Question 2

When configuring Internet access using a separate MPLS VPN, which three statements are correct? (Choose three)

A. The Internet backbone is separate from the MPLS VPN backbone.
B. Two dedicated physical or logical links between the PE and the CE routers are required.
C. An Internet gateway is connected as a CE router to the MPLS VPN backbone.
D. An Internet gateway shall insert full Internet routing into the Internet VPN to achieve optimal routing.
E. The customer’s Internet access is enabled by combining the Internet VPN with the Customer VPN using overlapping VPN topology.


Answer: A C E

Question 3

BGP is used as the CE-PE routing protocol in an MPLS VPN. The customer routes are successfully propagated from the CE router to the ingress PE router, but they are not showing up on the egress PE router. What is the most likely cause of the problem?

A. There is a BGP-to-MPBGP redistribution error on the ingress PE router. 
B. There is a MPBGP-to-BGP redistribution error on the egress PE router.
C. One of the P routers is performing route summarization, breaking the path between the ingress and the egress PE routers into two LSPs. 
D. RTs attached to the CE routes exported by the ingress router are not matched by at least one of the import RTs on the egress PE router. 
E. A route reflector is used to propagate the routes from the ingress PE router to the egress PE router, thus breaking the LSP


Answer: D

Question 4

Refer to the exhibit and the following connectivity requirements. Which type of MPLS VPN is being implemented?


Sites CE1A and CE1B require connectivity to each other.
Sites CE2A and CE2B require connectivity to each other.
Site CE1C requires connectivity to sites CE1A, CE1B, CE3A, and CE3B.
Site CE2C requires connectivity to sites CE2A, CE2B, CE3A, and CE3B.
Sites CE3A and CE3B require connectivity to each other and to CE1C and CE2C.

A. central services MPLS VPN
B. overlapping MPLS VPN
C. simple VPN
D. combinations of overlapping and central services MPLS VPN
E. combinations of simple and central services MPLS VPN


Answer: D

Question 5

Refer to the exhibit. Which two of these statements are correct? (Choose two)


A. Router C will aggregate the address and advertise only the summary address to its neighbors.
B. Router C will advertise the prefix and all of the more specific prefixes.
C. Router C cannot aggregate the prefix if it does not have a more specific prefix in its BGP table.
D. To aggregate the prefix, router C must originate that prefix from within AS 300.
E. Router C will only aggregate the prefix for any updates it is sending to AS 200.


Answer: B C

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