CompTIA Server+ (SK0-005) — Question 343

A senior administrator instructs a technician to run the following script on a Linux server:

for i in {1..65536}; do echo $i; telnet localhost $i; done

The script mostly returns the following message: Connection refused. However, there are several entries in the console display that look like this:

80

Connected to localhost -

443

Connected to localhost -

Which of the following actions should the technician perform NEXT?

Answer options

• A. Look for an unauthorized HTTP service on this server.
• B. Look for a virus infection on this server.
• C. Look for an unauthorized Telnet service on this server.
• D. Look for an unauthorized port scanning service on this server.

Correct answer: A

Explanation

The correct answer is A because the successful connections on ports 80 and 443 indicate that an HTTP service is running, which may be unauthorized. Option B is incorrect as there's no evidence of a virus infection. Option C is not applicable since the script is not finding unauthorized Telnet services, and option D does not relate to the observations made during the script execution.