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Which AS path matches the AS path regular expression sh…

Which AS path matches the AS path regular expression shown in the exhibit?

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A.
65100 65200 21870 21870

B.
65100 65101 65200 21780 21780

C.
65100 52870 65200 65300

D.
65100 65101 65200 65300 21870

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5 Comments on “Which AS path matches the AS path regular expression sh…

  1. basur1 says:

    Sorry, it is D 1000% OOPS

    The way to read it:

    First ASN is 65100
    Second ASN is any (65101 in this case)
    Third ASN could be one or more times either 65200 or 65300
    Last ASN is AS 21870.




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    1. dix says:

      I maked a test with the operador “+” joined to last one term (term after operador) , the operator is applied to penultimate term, not the last one.

      This is in the same way that the follow: 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

      “operator—(Optional) An operator specifying how the term must match. Most operators describe how many times the term must be found to be considered a match (for example, any number of occurrences, or zero, or one occurrence). Table 1 lists the regular expression operators supported for AS paths. You place operators immediately after term with no intervening space, except for the pipe ( | ) and dash (–) operators, which you place between two terms, and parentheses, with which you enclose terms.”

      Then: the correct answer is the “D” 65100 65101 65200 65300 21870

      The way to read it:

      First ASN is 65100
      Second ASN is any (65101 in this case)
      Third ASN could be one or more times either 65200 or 65300, this because the + operador is applied to (65200 |65300)
      Last ASN is AS 21870.




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