300-420 · Question #125
300-420 Question #125: Real Exam Question with Answer & Explanation
The correct answer is A: Tag incoming routes from both ISPs with BGP community no-export.. There are 4 methods how you can prevent becoming a transit AS: - Filter-list with AS PATH access-list. - No-Export Community. - Prefix-list Filtering - Distribute-list Filtering https://networklessons.com/bgp/bgp-prevent-transit-as
Question
An engineer is upgrading a company's main site to include a connection to a second ISP. The company will receive full Internet routing tables from both ISPs via BGP. The engineer must ensure that the company does not become a transit autonomous system. Which solution should be included in this design?
Options
- ATag incoming routes from both ISPs with BGP community no-export.
- BLower the MED for updates sent to the secondary ISP.
- CUse a route-map to prevent all prefixes from being advertised to either ISP.
- DModify the local-preference for routes incoming from the primary ISP.
Explanation
There are 4 methods how you can prevent becoming a transit AS: - Filter-list with AS PATH access-list. - No-Export Community. - Prefix-list Filtering - Distribute-list Filtering https://networklessons.com/bgp/bgp-prevent-transit-as
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