- A
The server's default gateway is set to the firewall's LAN IP
Why wrong: This is necessary for the server to reach the internet but does not affect inbound connections from the internet.
- B
The firewall's NAT is disabled
Why wrong: NAT translates private IPs to public ones, but if the server is accessible internally, NAT might be working; the issue is more specific to forwarding rules.
- C
Port forwarding rules are not configured on the firewall
Without port forwarding, the firewall does not know which internal device should receive incoming traffic on ports 80/443, so external requests are dropped.
- D
The server has a public IP address assigned
Why wrong: If the server had a public IP, it would likely be accessible, but the scenario states it uses a private IP (192.168.x.x), so this is not the case.
Why Is My Web Server Not Accessible from the Internet?
This 220-1201 practice question tests your understanding of network configuration concepts. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
A company's web server is accessible from the internal network but not from the internet. The server has a static IP of 192.168.1.10. The firewall is configured to allow HTTP and HTTPS traffic. What is the most likely missing configuration?
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.
Quick Answer
The answer is that port forwarding rules are not configured on the firewall. This is the most likely missing configuration because port forwarding is the mechanism that tells your firewall where to send incoming internet traffic; without a rule mapping external requests on ports 80 and 443 to the internal static IP 192.168.1.10, the firewall will drop those packets even if its own security policies allow HTTP and HTTPS. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of NAT and routing—a common trap is assuming that simply allowing the traffic through the firewall is enough, when in fact you must explicitly forward the ports to the server’s private IP. Remember the mnemonic “Forward to Find,” meaning you must forward external ports to find the internal server.
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
Port forwarding rules are not configured on the firewall
The server has a private IP (192.168.1.10), so for internet clients to reach it, the firewall must translate the public destination IP to the private server IP using port forwarding (a form of Destination NAT). Without port forwarding rules, the firewall will receive HTTP/HTTPS traffic on its public interface but not know which internal server to send it to, even though the firewall's ACL allows the traffic. Option C correctly identifies this missing configuration.
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 server's default gateway is set to the firewall's LAN IP
Why it's wrong here
This is necessary for the server to reach the internet but does not affect inbound connections from the internet.
- ✗
The firewall's NAT is disabled
- ✓
Port forwarding rules are not configured on the firewall
Why this is correct
Without port forwarding, the firewall does not know which internal device should receive incoming traffic on ports 80/443, so external requests are dropped.
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 server has a public IP address assigned
Why it's wrong here
If the server had a public IP, it would likely be accessible, but the scenario states it uses a private IP (192.168.x.x), so this is not the case.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume that simply allowing HTTP/HTTPS in the firewall's ACL is sufficient, forgetting that inbound traffic to a private IP requires a destination NAT (port forwarding) rule to map the public IP/port to the internal server.
Trap categories for this question
Scenario analysis trap
If the server had a public IP, it would likely be accessible, but the scenario states it uses a private IP (192.168.x.x), so this is not the case.
Detailed technical explanation
How to think about this question
Port forwarding is a specific type of Destination NAT (DNAT) where the firewall rewrites the destination IP and port of incoming packets based on a rule. In many SOHO firewalls, this is configured under 'Port Forwarding' or 'Virtual Server' settings, distinct from general NAT policies. A common subtlety is that the firewall's ACL (access control list) may allow the traffic, but without the DNAT rule, the packet's destination remains the firewall's public IP, and the firewall has no route to 192.168.1.10 unless it performs the translation.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this 220-1201 question test?
Network Configuration Concepts — This question tests Network Configuration Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Port forwarding rules are not configured on the firewall — The server has a private IP (192.168.1.10), so for internet clients to reach it, the firewall must translate the public destination IP to the private server IP using port forwarding (a form of Destination NAT). Without port forwarding rules, the firewall will receive HTTP/HTTPS traffic on its public interface but not know which internal server to send it to, even though the firewall's ACL allows the traffic. Option C correctly identifies this missing configuration.
What should I do if I get this 220-1201 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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Last reviewed: Jul 4, 2026
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