CompTIA Security+ (SY0-501) — Question 575

Which of the following is a passive method to test whether transport encryption is implemented?

Answer options

• A. Black box penetration test
• B. Port scan
• C. Code analysis
• D. Banner grabbing

Correct answer: D

Explanation

Banner grabbing is a method used to extract service and version information from servers, which can reveal whether transport encryption is enabled. In contrast, a black box penetration test and code analysis are more intrusive and active methods, while a port scan primarily identifies open ports but does not specifically confirm encryption.