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Which two statements are true in this scenario?

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Both autonomous systems shown in the exhibit use BGP with a full-mesh IPGP configuration within each
autonomous system and EBGP between the two autonomous systems. A single route is generated on R1 and
advertised into BGP.
Which two statements are true in this scenario? (Choose two.)

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A.
R4 will not automatically readvertise the route to R5.

B.
R5 will automatically readvertise the route to other routers in AS 65512.

C.
R5 will not automatically readvertise the route to other routers in AS 65512.

D.
R4 will automatically readvertise the route to R5.

Explanation:
In general, deployed BGP implementations do not advertise the external route with the highest local preference
value to internal peers unless it is the best route.

11 Comments on “Which two statements are true in this scenario?

    1. raju says:

      B and D are correct. R5 advertises the routes to its iBGP peers however routes are in hidden becoz of next hop unreachable, iBGP peers in AS65512 get the route…..tested in lab..




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  1. Craig Johnson says:

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  2. Loic says:

    B, D are the correct answers, i test it in LAB environement.
    The redistribution is automatic in both way. You only need to configure a next-hop-self on R5 so that the routers in AS65512 will install the route in their routing table (if not configured, route will appear in hidden because next-hop (R4 router) can not be reach by routers in AS65512).




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  3. Batsu says:

    Correct are B and D.

    Default policies of BGP:
    1.- Import Policy (All Peers) A BGP router will accept all non-looped BGP routes received from another BGP router.
    2.- Export Policy (External Peers) A BGP router will advertise all active BGP routes in inet.0 to all configured external BGP peers.
    3.- Export Policy (Internal Peers) A BGP router will advertise all active BGP routes in inet.0 to all internal peers if the routes were originally received from an external peer.




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