The answer is that the internet connection is down. This is correct because successfully pinging the local default gateway confirms that your computer, network cable, and local router are all functioning properly at both Layer 2 and Layer 3, meaning the issue lies beyond your local network. When you can ping the gateway but not an external IP, the traffic is reaching the router but failing to be forwarded upstream, which almost always points to a dead WAN link or an ISP outage. On the CompTIA ITF+ FC0-U61 exam, this scenario tests your ability to isolate network problems using the OSI model—a common trap is assuming a faulty NIC or wrong subnet mask, but those would break the gateway ping first. A helpful memory tip: if you can reach the gate but not the world, the road beyond is closed.
FC0-U61 Infrastructure Practice Question
This FC0-U61 practice question tests your understanding of infrastructure. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
C:\> ping 8.8.8.8
Pinging 8.8.8.8 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 8.8.8.8:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss)
C:\> ping 192.168.1.1
Pinging 192.168.1.1 with 32 bytes of data:
Reply from 192.168.1.1: bytes=32 time=1ms TTL=128
Reply from 192.168.1.1: bytes=32 time=1ms TTL=128
Reply from 192.168.1.1: bytes=32 time=1ms TTL=128
Reply from 192.168.1.1: bytes=32 time=1ms TTL=128
Ping statistics for 192.168.1.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss)
Refer to the exhibit. A user can successfully ping the local default gateway but cannot ping an external IP address. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The internet connection is down
Since the user can successfully ping the local default gateway, the Layer 2 and Layer 3 connectivity within the local subnet is intact, ruling out issues with the NIC, subnet mask, or local routing. The failure to ping an external IP address indicates that traffic is not being forwarded beyond the local network, which most commonly occurs when the internet connection (WAN link) is down or the ISP's upstream router is unreachable.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 internet connection is down
Why this is correct
The gateway works but external IP fails, indicating an issue beyond the gateway.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The network interface card is faulty
Why it's wrong here
If the NIC were faulty, the ping to the gateway would likely fail.
✗
The DNS server is not responding
Why it's wrong here
Ping uses an IP address, not DNS, so DNS is irrelevant.
✗
The subnet mask is misconfigured
Why it's wrong here
A misconfigured subnet mask would affect local pings, which are successful.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between local connectivity (Layer 2/3 within subnet) and external connectivity (Layer 3 routing beyond the gateway), leading candidates to incorrectly blame DNS or subnet mask when the real issue is the upstream connection.
Detailed technical explanation
How to think about this question
When a host pings its default gateway, it uses ARP to resolve the gateway's MAC address and sends the ICMP echo request directly at Layer 2. If the gateway responds, local connectivity is confirmed. For external pings, the gateway must route the packet to the next-hop router, typically over a WAN interface (e.g., PPPoE, DHCP-assigned default route). If the WAN link is down, the gateway has no route to the external IP, so it drops the packet or returns a 'Destination Unreachable' ICMP message. This scenario is often tested with the 'ip route 0.0.0.0 0.0.0.0 <next-hop>' command missing or the WAN interface being administratively down.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Infrastructure — This question tests Infrastructure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The internet connection is down — Since the user can successfully ping the local default gateway, the Layer 2 and Layer 3 connectivity within the local subnet is intact, ruling out issues with the NIC, subnet mask, or local routing. The failure to ping an external IP address indicates that traffic is not being forwarded beyond the local network, which most commonly occurs when the internet connection (WAN link) is down or the ISP's upstream router is unreachable.
What should I do if I get this FC0-U61 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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