JN0-351: Enterprise Routing and Switching, Specialist (JNCIS-ENT)Demo

By Juniper · Question Mode

QuestionQ20

BGP

Which two BGP statements help prevent routing loops between two autonomous systems?

Choose two
  • A EBGP routers will append their AS number when advertising routes to their neighbors.
  • B EBGP routers will only accept routes that contain their own AS number in the AS_PATH.
  • C EBGP routers will drop routes that contain their own AS number in the AS_PATH.
  • D EBGP routers will prepend their AS number when advertising routes to their neighbors.
Explanation

BGP adds the advertising autonomous system’s AS number to the front of the AS_PATH on eBGP advertisements. A BGP speaker discards routes whose AS_PATH already includes its own AS number, preventing the route from returning to an autonomous system it has traversed.

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