You work as a network designer for a company that is replacing their Frame Relay WAN with an MPLS VPN
service, where the PE-to-CE routing protocol is BGP. The company has 3000 routes in their distribution
routers, and they would like to advertise their access routers through the MPLS network. Their service
provider, however, only supports 1000 prefixes per VRF. Which two design solutions can be applied toensure
that your access routers will be able to reach all devices in your network? (Choose two.)
A. Use prefix lists on your distribution routers to control which routes are sent to the MPLS network.
B. On your distribution routers, configure null routes and aggregate routes for the prefixes in your network.
C. Configure your distribution routers to send a default route to the MPLS network.
D. Summarize the routes on the MPLS WAN interfaces of your distribution routers.
Answer: BC
Explanation:
Shouldn’t the answer be B and D?
I agree aggregate routes should be configured on the distribution routers. These summaries should also be advertised by BGP (on the MPLS WAN interfaces of the distribution routerss) which would be choice D.
Advertising a default route from each distribution router into the MPLS network doesn’t make sense to me.
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“Which two design solutions can be applied to ensure
that your access routers will be able to reach all devices in your network? ”
Last line makes me think B and D would be best answer.
C doesn’t sound like it would work for that requirement.
It would be different if it said something like “advertise TO access layer” instead of “to MPLS” (although that would not make much sense when the question is about the MPLS not being able to handle the amt of prefixes…).
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What’s more, part of that new 493Q 352-001 dumps are available here:
https://drive.google.com/open?id=0B-ob6L_QjGLpflFYOFdyS1ctQVc2X1cwT0d2R2dyZzBsb2hPaGw5V2Y5akx5QmxxYUdOOUU
Best Regards!
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