300-420 Exam Dumps | An engineer is upgrading a company's main site to include a connection to a second ISP. The company will

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Question 150/151

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?

A. Tag incoming routes from both ISPs with BGP community no-export.

B. Lower the MED for updates sent to the secondary ISP.

C. Use a route-map to prevent all prefixes from being advertised to either ISP.

D. Modify the local-preference for routes incoming from the primary ISP.

Correct Answer: A

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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