4A0-114: Nokia Border Gateway Protocol Fundamentals for ServicesDemo

By Nokia · Question Mode

QuestionQ8

Border Gateway Protocol Fundamentals

A BGP router receives these routes. Which route is chosen as the best route?

  1. 192.169.20.0/24 with local preference 100, MED 150, AS Path 65300 65200, from an eBGP neighbor
  2. 192.169.20.0/24 with local preference 100, MED 100, AS Path 63200, from an iBGP neighbor
  3. 192.169.20.0/24 with local preference 200, MED 150, AS Path 65400 63200, from an iBGP neighbor
  4. 192.169.20.0/24 with local preference 200, MED 100, AS Path 63700, from an eBGP neighbor
  • A Route 1
  • B Route 2
  • C Route 3
  • D Route 4
Explanation

BGP prefers the route with the highest local preference. Between the two routes with local preference 200, it next prefers the shorter AS path. The path through AS 63700 has one AS hop, whereas the alternative has two AS hops.

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