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Question 108/140
An engineer configured regular expression "."\.(pd][Oo][Cc)|[Xx][LI][Ss]|[Pp][Pp][Tt]) HTTP/1 .[01]" on Cisco ASA firewall. What does this regular expression do?
Correct Answer: D
The regular expression provided is: .\.(pd][Oo][Cc)|[Xx][LI][Ss]|[Pp][Pp][Tt]) HTTP/1 .[01] This regular expression is designed to match file extensions for Word (.doc), Excel (.xls), and PowerPoint (.ppt) files in HTTP network sessions.
The regular expression uses character classes and alternatives to match different case variations of these file extensions.
The part .\.(pd][Oo][Cc)|[Xx][LI][Ss]|[Pp][Pp][Tt]) matches the file extensions, and HTTP/1 .[01] ensures that the match is in the context of HTTP version 1.0 or 1.1.
Reference:
Cisco ASA Regular Expressions Documentation
Understanding Regular Expressions in Network Security
Filtering and Capturing HTTP Traffic with Regex
The regular expression uses character classes and alternatives to match different case variations of these file extensions.
The part .\.(pd][Oo][Cc)|[Xx][LI][Ss]|[Pp][Pp][Tt]) matches the file extensions, and HTTP/1 .[01] ensures that the match is in the context of HTTP version 1.0 or 1.1.
Reference:
Cisco ASA Regular Expressions Documentation
Understanding Regular Expressions in Network Security
Filtering and Capturing HTTP Traffic with Regex
- Question List (140q)
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