Let’s break it down:
65100 → The AS path must start with AS 65100.
. (Dot) → Matches any single AS number after 65100.
(65200|65300) → The next AS number must be either 65200 or 65300.
+ (One or More Times) → The previous AS (65200 or 65300) must appear at least once.
21870 → The AS path must end with 21870.
Correct Answer : D
A. The period before the second AS indicates the the second AS must be one of the two in the brackets. That means the first AS cannot be doubled. The plus before the last AS means it can be repeated as many times as you want.
D is correct:
https://www.juniper.net/documentation/en_US/junos/topics/usage-guidelines/policy-configuring-as-path-regular-expressions-to-use-as-routing-policy-match-conditions.html
There seems to be a typo error with answer B. Agree it would be the best answer if the repeated AS matched what is in the question.
upvoted 2 times
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