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What is used by BGP to guarantee a loop free path to reach a destination?

  • a record of each autonomous system that a routing advertisement has traversed
  • a distance calculation based on cumulative delay and minimum bandwidth
  • the count of router hops to reach a destination
  • the cumulative cost as measured in bandwidth
Answers Explanation & Hints:

BGP is a path vector protocol which uses several path attributes to determine the best path. To prevent loops BGP updates include a record of each autonomous system that the routing advertisement traversed. A BGP router that receives the update should not see its own AS in the AS Path. If it did, it would indicate a loop.

For more Questions and Answers:

CCNPv8 ENCOR (Version 8.0) – Chapters 6 – 7: Routing Essentials and EIGRP Exam Answers Full 100%

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