CAS-005 Exam Dumps : CompTIA SecurityX Certification Exam

Step-by-Step Explanation:

Understand the QuestionRequirements:The goal is to use a regular expression (regex) to match software versions 10.0 through 10.3, but exclude version 10.4.

Review Regex Syntax:

[ ] indicates a character set (matches any one character in the set).

[0-3] matches any digit between 0 and 3.

\. escapes the period (.) so it matches a literal period instead of acting as a wildcard.

( ) groups parts of the regex together.

Analyze Each Option:

Option A: Reader(*)[1][0] .[0-4:

Incorrect. The use of (*) is not valid syntax in this context and [0-4 is incomplete or misformatted.

Option B: Reader[11[01X.f0-3 '

Incorrect. This is an invalid regex syntax, mixing character sets and mismatched brackets.

Option C: Reader( )[1][0] .[0-3:

Correct. This regex is valid and matches " Reader 10.0 " , " Reader 10.1 " , " Reader 10.2 " , and " Reader 10.3 " while excluding " Reader 10.4 " .

Breakdown:

Reader: Matches the text " Reader " .

[1][0] : Matches " 10 " as a combination of two characters.

\.: Matches the literal period.

[0-3]: Matches any single digit between 0 and 3.

Option D: Reader( )[1][0] X.[1-3:

Incorrect. The syntax X.[1-3 is invalid, and this does not match the required versions.

Conclusion:The regex in Option C correctly identifies all affected versions (10.0, 10.1, 10.2, 10.3) while excluding the unaffected version (10.4).

To prevent unauthorized applications from running, the company needs a mechanism to explicitly define and enforce which applications are allowed to execute. " Permit listing " (often referred to as " whitelisting " in security contexts) is the most effective solution here. It involves creating a list of approved applications, and only those on the list are permitted to run, blocking all others by default. This directly addresses the root cause—users installing unapproved software—by restricting execution to only authorized programs.

Option A (Signing):Code signing ensures the authenticity and integrity of software by verifying it comes from a trusted source and hasn’t been tampered with. While useful, it doesn’t inherently prevent unauthorized applications from running unless combined with a policy like whitelisting.

Option B (Access control):Access control governs who can access systems or resources but doesn’t specifically restrict which applications can execute. It’s too broad for this scenario.

Option C (HIPS):A Host-based Intrusion Prevention System (HIPS) can detect and block malicious behavior, but it’s reactive and relies on signatures or heuristics, not a proactive allow-only approach.

Option D (Permit listing):This is the best fit, as it proactively enforces a policy where only explicitly authorized applications can run, preventing malware introduced by unauthorized software.