Your BGP router receives routes from two upstream ISPs: ISP A and ISP B. In this scenario, which change would you make to prefer routes from ISP A?
A.
Set the local-preference attribute for all routes received from ISP A to 200 while all routes received from ISP B use the default local-preference value of 100.
B.
Prepend the AS path to all routes received from ISP A while all routes received from ISP B use the default AS path value.
C.
Change the MED value for all routes received from ISP A to 1 while all routes from ISP B remain configured with no MED value.
D.
Set the local-preference attribute for all routes received from ISP A to 50 while all routes received from ISP B use the default local-preference value of 100.
The correct answer is:
A. Set the local-preference attribute for all routes received from ISP A to 200 while all routes received from ISP B use the default local-preference value of 100.
Explanation: The local-preference attribute is used to influence the BGP route selection process within an autonomous system. A higher local-preference value is preferred, so by setting a higher value for routes received from ISP A, the BGP router will prefer those routes over the ones received from ISP B.
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