300-420 · Question #209
300-420 Question #209: Real Exam Question with Answer & Explanation
The correct answer is C: Request a full internet routing table and a default route from the ISP and configure inbound route. Any change on the prefix list, engineer only need to update the prefix list and restart the BGP peer to the ISP. soft-reconfiguration inbound could be used to reduce down time of reset BGP peer, but it require lots of memory and in this case, connection to ISP and tons of route l
Question
An engineer must peer with an ISP for internet connectivity using BGP, initially, the engineer wants to receive only specific prefixes from the ISP and a default route. However, the solution must provide the flexibility to add prefixes in the future at short notice. The ISP has a two-week change process in place. Which route filtering solution must the engineer employ?
Options
- ARequest a limited internet routing table and a default route from the ISP and configure the BGP
- BRequest only the required prefixes and default route be advertised from the ISO with whitelisted
- CRequest a full internet routing table and a default route from the ISP and configure inbound route
- DConfigure outbound route filtering on the enterprise and ISP so that the enterprise tell the ISP
Explanation
Any change on the prefix list, engineer only need to update the prefix list and restart the BGP peer to the ISP. soft-reconfiguration inbound could be used to reduce down time of reset BGP peer, but it require lots of memory and in this case, connection to ISP and tons of route learnt will not be appropriated.
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