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Which AS path regular expression will only match a route originating in AS 500 with the last traversing AS of

Which AS path regular expression will only match a route originating in AS 500 with the last traversing AS of 100?

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A.
"$100 .* ^500"

B.
"500 .*"

C.
"^100 .* 500$"

D.
"^100 .*"

3 Comments on “Which AS path regular expression will only match a route originating in AS 500 with the last traversing AS of

  1. traffikator says:

    The first indicator that C is wrong is ^. It means starting AS. $means ending AS. A is the correct choice.
    BGP AS path is read from right to left meaning the right most AS is the beginning and the left is the final.




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