BGP Attributes: Concept and Operation JN0-650 Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   Your AS 65001 has two eBGP peers to the same upstream provider, one in New York and one in Los Angeles. You want all outbound traffic from your AS to prefer the New York link, regardless of which router learns the route. You have configured a routing policy that sets an attribute on routes received from the New York peer. Which attribute must the policy set, and how should it be propagated to ensure all routers in your AS make the same decision?

   • ASet local preference to 200 on routes from the New York peer; the attribute is propagated to all iBGP peers within the AS.
   • BSet AS path prepend to 200 on routes from the New York peer; the attribute is propagated to all iBGP peers within the AS.
   • CSet origin to IGP on routes from the New York peer; the attribute is propagated to all iBGP peers within the AS.
   • DSet MED to 200 on routes from the New York peer; the attribute is propagated to all iBGP peers within the AS.
   Reveal Solution Discussion Select an answer first
2. 2application · medium

   Your router receives three routes to the same destination prefix from different peers. Route A has an origin of IGP, Route B has an origin of EGP, and Route C has an origin of incomplete. All other attributes are identical. Which route will be preferred in BGP best-path selection?

   • ARoute C, because incomplete is preferred over IGP and EGP.
   • BRoute A, because IGP is preferred over EGP and incomplete.
   • CAll routes are equally preferred because origin is not used in best-path selection.
   • DRoute B, because EGP is preferred over IGP and incomplete.
   Reveal Solution Discussion Select an answer first
4. 3foundation · easy

   An unrecognized optional attribute is received in a BGP update. Which attribute category determines whether the router must propagate the attribute to its BGP peers?

   • AWell-known discretionary
   • BOptional non-transitive
   • COptional transitive
   • DWell-known mandatory
   Reveal Solution Discussion Select an answer first
5. 4foundation · easy

   Which BGP path attribute category must be present in every BGP route and must be recognized by all BGP implementations, but its value is not required to be included in every update?

   • AWell-known discretionary
   • BOptional non-transitive
   • COptional transitive
   • DWell-known mandatory
   Reveal Solution Discussion Select an answer first
6. 5foundation · easy

   What is the primary purpose of the local preference attribute in BGP?

   • ATo prevent routing loops between ASes
   • BTo tag routes with community values
   • CTo influence inbound traffic entering the AS
   • DTo influence outbound traffic leaving the AS
   Reveal Solution Discussion Select an answer first