400-007 · Question #401
400-007 Question #401: Real Exam Question with Answer & Explanation
The correct answer is D: Include an AS path access list to send routes to the neighboring ASs that only have an empty AS. Using an AS path access list helps ensure that only routes originating from the customer AS (AS 111) are advertised to another ASs. By filtering routes with an empty AS path field, AS 111 can prevent being used as a transit AS by disallowing routes coming from another ASs. This i
Question
Exhibit
Options
- AUse the local preference attribute to configure your AS as a "non-transit" AS.
- BInclude a prefix list to only receive routes from neighboring ASs.
- CConfigure the AS-set attribute to allow only routes from AS 111 to be propagated to the neighbor
- DInclude an AS path access list to send routes to the neighboring ASs that only have an empty AS
Explanation
Using an AS path access list helps ensure that only routes originating from the customer AS (AS 111) are advertised to another ASs. By filtering routes with an empty AS path field, AS 111 can prevent being used as a transit AS by disallowing routes coming from another ASs. This is a more comprehensive approach compared to other methods in the options provided.
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