- A
The router is performing static NAT for two internal hosts.
The first two entries show a one-to-one mapping between inside local and inside global addresses without any protocol or outside address, which is characteristic of static NAT.
- B
The router is performing dynamic NAT for all translations.
Why wrong: The first two entries are static, not dynamic. Only the third entry is dynamic.
- C
The router is performing Port Address Translation (PAT) for all translations.
Why wrong: The first two entries do not use port numbers, so they are not PAT. The third entry uses a port, but it is only one translation.
- D
The router is translating outside global addresses to inside local addresses.
Why wrong: NAT translates inside local to inside global, not the other way around. The outside addresses remain unchanged.
CCNP Infrastructure Security Practice Question
This 350-401 practice question tests your understanding of infrastructure security. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 engineer runs the following command on Router R1:
R1# show ip nat translations
Pro Inside global Inside local Outside local Outside global --- 203.0.113.10 192.168.1.10 --- --- --- 203.0.113.11 192.168.1.11 --- --- tcp 203.0.113.10:1024 192.168.1.10:1024 198.51.100.5:80 198.51.100.5:80
Based on this output, what can be concluded?
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
The router is performing static NAT for two internal hosts.
The output shows NAT translations. The first two lines are static NAT entries (no protocol, no outside address). The third line is a dynamic translation for a TCP session. The inside local addresses are private (192.168.1.x), and inside global addresses are public (203.0.113.x). The outside addresses are public. This is typical for PAT or dynamic NAT.
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.
- ✓
The router is performing static NAT for two internal hosts.
- ✗
The router is performing dynamic NAT for all translations.
Why it's wrong here
The first two entries are static, not dynamic. Only the third entry is dynamic.
- ✗
The router is performing Port Address Translation (PAT) for all translations.
Why it's wrong here
The first two entries do not use port numbers, so they are not PAT. The third entry uses a port, but it is only one translation.
- ✗
The router is translating outside global addresses to inside local addresses.
Why it's wrong here
NAT translates inside local to inside global, not the other way around. The outside addresses remain unchanged.
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 350-401 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this 350-401 question test?
Infrastructure Security — This question tests Infrastructure Security — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The router is performing static NAT for two internal hosts. — The output shows NAT translations. The first two lines are static NAT entries (no protocol, no outside address). The third line is a dynamic translation for a TCP session. The inside local addresses are private (192.168.1.x), and inside global addresses are public (203.0.113.x). The outside addresses are public. This is typical for PAT or dynamic NAT.
What should I do if I get this 350-401 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 350-401 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 18, 2026
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