You must ensure that the VPN backbone is preferred over the back door intra-area link as long as the VPN is available. Referring to the exhibit, which action will accomplish this task?

Exhibit

You must ensure that the VPN backbone is preferred over the back door intra-area link as long as the VPN is available. Referring to the exhibit, which action will accomplish this task?
A . Configure an import routing policy on the CE routers that rejects OSPF routes learned on the backup intra-area link.
B. Enable OSPF traffic-engineering.
C. Configure the OSPF metric on the backup intra-area link that is higher than the L3VPN
link.
D. Create an OSPF sham link between the PE routers.

View Answer

Answer: D

Explanation:

A sham link is a logical link between two PE routers that belong to the same OSPF area but are connected through an L3VPN. A sham link makes the PE routers appear as if they are directly connected, and prevents OSPF from preferring an intra-area back door link over the VPN backbone. To create a sham link, you need to configure the local and remote addresses of the PE routers under the [edit protocols ospf area area-id] hierarchy level1.