Exam 400-007 Topic 4 Question 227 Discussion
Actual exam question for Cisco's 400-007 exam
Question #: 227
Topic #: 4
Question #: 227
Topic #: 4
Refer to the exhibit.
An engineer is designing the traffic flow for AS 111. Traffic from AS 111 should be preferred via AS 100 for all external routes. A method must be used that only affects AS 111. Which BGP attributes are best suited to control outbound traffic?
An engineer is designing the traffic flow for AS 111. Traffic from AS 111 should be preferred via AS 100 for all external routes. A method must be used that only affects AS 111. Which BGP attributes are best suited to control outbound traffic?
Suggested Answer: C Vote an answer
The scenario requires controlling how AS 111 sends its outbound traffic (egress traffic). BGP policy control for outbound traffic is best handled via manipulating the BGP Local Preference attribute, as:
* Local Preference (LocalPref) influences path selection for outbound traffic by setting a preference for one path over another.
* It is evaluated within the AS and does not require coordination with external autonomous systems.
* LocalPref changes are fully contained inside AS 111 and satisfy the requirement to only affect AS 111.
* A higher Local Preference value is preferred, thus you set higher values for routes learned via AS 100.
Why other options are incorrect:
* A (community): Typically influences inbound traffic or interacts with upstream providers.
* B (MED): Influences inbound traffic for external neighbors, not outbound.
* D (AS Path): Also primarily influences inbound traffic selection by remote ASes.
* Local Preference (LocalPref) influences path selection for outbound traffic by setting a preference for one path over another.
* It is evaluated within the AS and does not require coordination with external autonomous systems.
* LocalPref changes are fully contained inside AS 111 and satisfy the requirement to only affect AS 111.
* A higher Local Preference value is preferred, thus you set higher values for routes learned via AS 100.
Why other options are incorrect:
* A (community): Typically influences inbound traffic or interacts with upstream providers.
* B (MED): Influences inbound traffic for external neighbors, not outbound.
* D (AS Path): Also primarily influences inbound traffic selection by remote ASes.
by Reginald at Oct 07, 2026, 05:17 AM
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