In the topology shown in the exhibit, which two BGP attributes can AS1 manipulate to influence the path that AS4 takes to reach prefixes originated by AS1? (Choose two.)
A.
Local Preference
B.
AS Path
C.
Origin
D.
MED
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I think the answer must be: A and B
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You are thinking in wrong manner.
The local preference is used to manipulate the traffic in other direction. It have a scope of local AS.
The MED cannot be used because by default (without path-selection always-compare-med knob) it is used only for paths with the same neighboring AS numbers at the front of the AS path.
So BC is 100% right answer.
More info can be found here http://www.juniper.net/techpubs/software/junos/junos94/swconfig-routing/how-the-active-route-is-determined.html
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