CompTIA Network+ (N10-008) — Question 371

An engineer is using a tool to run an ICMP sweep of a network to find devices that are online. When reviewing the results, the engineer notices a number of workstations that are currently verified as being online are not listed in the report.

The tool was configured to scan using the following information:

Network address: 172.28.16.0 -

CIDR: /22 -

The engineer collected the following information from the client workstation:

IP address: 172.28.17.206 -

Subnet mask: 255.255.252.0 -

Which of the following MOST likely explains why the tool is failing to detect some workstations?

Answer options

• A. The scanned network range is incorrect.
• B. The subnet mask on the client is misconfigured.
• C. The workstation has a firewall enabled.
• D. The tool is unable to scan remote networks.

Correct answer: C

Explanation

The correct answer is C because if a workstation has a firewall enabled, it may block ICMP requests, preventing the tool from detecting it. Options A and B are incorrect because the network range and subnet mask are properly configured for the given IP. Option D is not relevant since the tool is intended to scan the local network.