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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?
Correct Answer: C
Explanation A firewall is a device or software that filters and controls the incoming and outgoing network traffic based on predefined rules. A firewall can block ICMP packets, which are used for ping and other diagnostic tools. If the workstation has a firewall enabled, it may not respond to the ICMP sweep and appear as offline. The engineer should check the firewall settings on the workstation and allow ICMP traffic if needed. References: Network+ Study Guide Objective 4.1: Given a scenario, use the appropriate tool.