Understanding Cisco Cybersecurity Operations Fundamentals (CBROPS) — Question 220

An engineer configured regular expression ".*\.([Dd][Oo][Cc]|[Xx][LI][Ss]|[Pp][Pp][Tt]) HTTP/1.[01]" on Cisco ASA firewall. What does this regular expression do?

Answer options

• A. It captures .doc, .xls, and .pdf files in HTTP v1.0 and v1.1.
• B. It captures documents in an HTTP network session.
• C. It captures Word, Excel, and PowerPoint files in HTTP v1.0 and v1.1.
• D. It captures .doc, .xls, and .ppt files extensions in HTTP v1.0.

Correct answer: C

Explanation

The correct answer is C because the regular expression specifically identifies files with extensions .doc, .xls, and .ppt, which correspond to Word, Excel, and PowerPoint formats, respectively, in HTTP versions 1.0 and 1.1. Option A is incorrect as it includes .pdf, which is not mentioned in the regex. Option B is too vague, and option D is incorrect because it omits the .ppt extension.