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Exam 300-420 topic 1 question 100 discussion

Actual exam question from Cisco's 300-420
Question #: 100
Topic #: 1
[All 300-420 Questions]

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.
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Suggested Answer: A 🗳️
by ExodiaNecross59 at Dec. 14, 2020, 1:16 p.m.

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ExodiaNecross59
Highly Voted 3 years, 10 months ago
As far as I know 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
upvoted 7 times
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TheGorn
Most Recent 10 months ago
Selected Answer: A
no-export and no-advertise has been repeated endlessly in the course content.
upvoted 3 times
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