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All ISP networks shown in the exhibit contain many BGP speaking routers. You are in charge of ISP A. You must ensure that customer Y sends their traffic to you over the directly connected link but customer Y is not used for transit into your network.
What do you do to accomplish this?
A. Advertise routes to customer Y with a higher MED than routes advertised to customer X.
B. Advertise routes to customer Y with the well-known no-advertise community.
C. Advertise routes to customer Y with your AS number prepended four times.
D. Advertise routes to customer Y with the well-known no-export community.
Answer: D