300-510 · Question #299
300-510 Question #299: Real Exam Question with Answer & Explanation
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Question
Refer to the exhibit. A Tier 1 ISP provides connectivity services to two regional ISPs, ISP1 and ISP2, leveraging the MPLS network. OSPF is used as an internal routing protocol, and BGP is used for communication with external customers. After maintenance work on the backbone, connectivity between ISP1 and ISP2 started to fail. A network engineer for the Tier 1 ISP determined that hosted shared resources with IP prefix 192.0.21.0/24 are not reachable from the IPS2 side. Which action must be taken to restore connectivity?
Options
- AEnable MPLS on all interfaces in the MPLS network within the Tier 1 ISP backbone.
- BIncrease the OSPF cost for routes received from ISP1 on PE1.
- CIncrease the BGP local preference for routes received from ISP1 on PE1.
- DEnable CEF on all routers in the MPLS network within the Tier 1 ISP backbone.
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