220-802 Question #4: Real Exam Question with Answer & Explanation

The correct answer is B: Configure a firewall exception on the Home PC.. Port forwarding on the router directs inbound traffic to the correct internal host, but the Windows Firewall on the home PC may still be blocking that traffic, requiring a specific inbound exception.

Question

A user is trying to access an application on their home machine from work. The user sets up port forwarding on their router but is still unable to connect to the application. Which of the following should be the user's NEXT step in resolving this issue?

Options

AConfigure Wake-on-LAN for the NIC on the Work PC.
BConfigure a firewall exception on the Home PC.
CSwitch the Work PC network from "Work" to "Home".
DDisable the Windows firewall on the Home PC.

Explanation

Port forwarding on the router directs inbound traffic to the correct internal host, but the Windows Firewall on the home PC may still be blocking that traffic, requiring a specific inbound exception.

Common mistakes.

A. Wake-on-LAN is used to power on a sleeping machine remotely; it does not resolve a firewall or connectivity issue on a machine that is already running.
C. Changing the network profile on the work PC affects local network discovery settings at work and has no effect on inbound rules or accessibility of the home machine.
D. Completely disabling the Windows Firewall on the home PC is a security risk and is not a best-practice troubleshooting step when simply adding an exception to the existing firewall will resolve the issue.

Concept tested. Firewall exception configuration for port forwarding

Reference. https://learn.microsoft.com/en-us/windows/security/operating-system-security/network-security/windows-firewall/create-an-inbound-port-rule

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