- A
Check if the web server is running HTTPS service on port 443.
This step targets the application layer, where the symptom most likely resides. The ACL permits all IP traffic and the static NAT is successfully translating port 80, ruling out misconfigurations there.
- B
Verify that the ACL applied to the outside interface explicitly permits TCP port 443.
Why wrong: This action targets a Layer 4 filter that has already been ruled out, because the existing ACL allows all IP traffic, which includes any TCP port.
- C
Examine the NAT translation table for any conflicting dynamic entries.
Why wrong: This action incorrectly assumes a dynamic NAT conflict in a pure static NAT setup. Static NAT has no dynamic entries that could conflict.
- D
Confirm the inside global IP address mapped to the server is correct.
Why wrong: This action would re-check a mapping that is already proven to work for port 80. If the IP were wrong, no ports would be reachable.
Quick Answer
The answer is to check if the web server is running HTTPS service on port 443. This is correct because static NAT troubleshooting must follow the OSI model from the bottom up; since the ACL permits all traffic and the translation works for port 80, the issue is not with Layer 3/4 filtering or the NAT configuration itself. The problem lies at the application layer, meaning the server is simply not listening on TCP 443. On the CCNA 200-301 v2 exam, this scenario tests your ability to isolate network versus host issues—a common trap is to immediately blame NAT or ACLs when connectivity fails on a specific port. Remember that static NAT translates all ports by default, so if one port works and another does not, the server’s service is the likely culprit. Memory tip: “If 80 works but 443 fails, don’t blame the router—check the server’s ears.”
CCNA Network Services and Security Practice Question
This 200-301 practice question tests your understanding of network services and security. 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.
A network technician has configured static NAT with the command ip nat inside source static 192.168.1.10 203.0.113.10. The web server at 192.168.1.10 is accessible from the internet on TCP port 80 but not on TCP port 443. The ACL applied to the outside interface permits all IP traffic. What is the most appropriate next step to troubleshoot this issue?
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
Check if the web server is running HTTPS service on port 443.
Since the ACL already permits all IP traffic and the static NAT translation works for port 80, the problem is not at Layer 3/4 filtering or NAT. The most likely cause is an application-layer issue: the web server is not listening on port 443. Checking the server's HTTPS service directly addresses that.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Check if the web server is running HTTPS service on port 443.
- ✗
Verify that the ACL applied to the outside interface explicitly permits TCP port 443.
- ✗
Examine the NAT translation table for any conflicting dynamic entries.
Why it's wrong here
This action incorrectly assumes a dynamic NAT conflict in a pure static NAT setup. Static NAT has no dynamic entries that could conflict.
- ✗
Confirm the inside global IP address mapped to the server is correct.
Why it's wrong here
This action would re-check a mapping that is already proven to work for port 80. If the IP were wrong, no ports would be reachable.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓Check if the web server is running HTTPS service on port 443.Correct answer▾
Why this is correct
This step targets the application layer, where the symptom most likely resides. The ACL permits all IP traffic and the static NAT is successfully translating port 80, ruling out misconfigurations there.
✗Verify that the ACL applied to the outside interface explicitly permits TCP port 443.Wrong answer — click to see why▾
Why this is wrong here
The already-configured ACL permits all IP traffic, so explicitly allowing port 443 would not resolve a server not listening on that port. This step wastes time on a verified configuration.
✗Examine the NAT translation table for any conflicting dynamic entries.Wrong answer — click to see why▾
Why this is wrong here
Static NAT does not use dynamic overload entries. There are no conflicting entries because NAT overload is not configured, making this check irrelevant.
✗Confirm the inside global IP address mapped to the server is correct.Wrong answer — click to see why▾
Why this is wrong here
The fact that port 80 works shows the inside global IP is correct. Re-verifying it would not explain the port-specific failure, as the issue is not with the translation.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 200-301 NAT questions on configuration and troubleshooting.
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Network Services and Security — study guide chapter
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FAQ
Questions learners often ask
What does this 200-301 question test?
Network Services and Security — This question tests Network Services and Security — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Check if the web server is running HTTPS service on port 443. — Since the ACL already permits all IP traffic and the static NAT translation works for port 80, the problem is not at Layer 3/4 filtering or NAT. The most likely cause is an application-layer issue: the web server is not listening on port 443. Checking the server's HTTPS service directly addresses that.
What should I do if I get this 200-301 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 200-301 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
2 more ways this is tested on 200-301
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A router has this command configured: `ip nat inside source static 192.168.1.50 203.0.113.50`. What is the main effect of this configuration?
hard- ✓ A.It creates a permanent one-to-one translation between the inside host and a public address
- B.It enables PAT overload for all internal users
- C.It blocks inbound access to the inside host permanently
- D.It changes the host subnet mask to a public prefix
Why A: This command creates a static NAT mapping between one inside local address and one inside global address. In plain language, the internal device at 192.168.1.50 will always appear as 203.0.113.50 to the outside world. That fixed relationship is useful when a particular internal host or service must be reachable consistently from outside networks. This is different from PAT, which shares one public address across many sessions using ports. Static NAT is one-to-one and predictable. It does not dynamically pull from a pool in this syntax. The key idea is permanence: the same inside device is always mapped to the same outside address.
Variation 2. A show ip nat translations command displays this entry: Inside global 203.0.113.10:30001 Inside local 192.168.10.25:51514 Outside local 198.51.100.20:443 Outside global 198.51.100.20:443 Which statement is correct?
medium- ✓ A.192.168.10.25 is the inside local address of the host
- B.203.0.113.10 is the inside local address of the host
- C.198.51.100.20 is the translated private address of the internal client
- D.The entry proves static NAT is being used without port translation
Why A: Inside local is the actual address assigned to the inside host before translation. The inside global address is the public representation used after NAT, and the port values show PAT is in use.
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Last reviewed: Jun 14, 2026
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