Which of the following BEST explains why a penetration tester cannot scan a server that was previously scanned successfully?

Which of the following BEST explains why a penetration tester cannot scan a server that was previously scanned successfully?
A . The IP address is wrong.
B. The server is unreachable.
C. The IP address is on the blocklist.
D. The IP address is on the allow list.

View Answer

Answer: B

Explanation:

A server may be unreachable for a variety of reasons, such as network outages, changes in firewall rules, the server being offline or otherwise unavailable. This would prevent a penetration tester from scanning the server, even if it was previously scanned successfully.

A) While a wrong IP address would prevent successful scanning, it doesn’t explain why a server that was previously scanned successfully cannot be scanned now.

C) While a blocklist would prevent a server from being scanned, it’s less likely to be the reason in this case, as a blocklist would likely have prevented the original successful scan as well.

D) Being on an allow list would not prevent a server from being scanned. Instead, it would more likely enable it to be scanned, since allow lists typically contain IP addresses that are permitted to perform certain actions.