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FC0-U71 Practice Question: Refer to the exhibit

Exhibit

IPv4 Address: 192.168.1.10
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.1.1

Refer to the exhibit. A user on this computer can browse the internet but cannot ping another computer at 192.168.1.20. What is the most likely cause?

⚠ Common exam trap

A common mix-up: candidates assume a failed ping always indicates a network connectivity problem, but CompTIA tests the understanding that ICMP can be selectively blocked by a firewall while other traffic continues to work.

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

A firewall is blocking ICMP traffic

The user can browse the internet, which confirms that the default gateway, DNS resolution, and subnet mask are correctly configured. However, the ping command fails specifically to 192.168.1.20, a local address. This indicates that ICMP traffic (used by ping) is being blocked, most likely by a firewall on the target computer or an intermediate device, while other traffic (HTTP/HTTPS) is permitted.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
The default gateway is incorrect
Why it's wrong here
If gateway were wrong, internet access would fail.
✗
The DNS server is unreachable
Why it's wrong here
DNS is not needed for pinging an IP address.
✓
A firewall is blocking ICMP traffic
Why this is correct
Firewalls often block ping (ICMP) while allowing other traffic.
✗
The subnet mask is wrong
Why it's wrong here
Wrong subnet mask would prevent communication with local devices.

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FC0-U71 Practice Question: Refer to the exhibit

Exhibit

Why each option matters

Option-by-option breakdown

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