- A
It dynamically allocates the global address from a pool and removes the entry after an idle timeout.
Why wrong: This describes dynamic NAT, not static NAT.
- B
It creates a permanent mapping that remains in the NAT table until the configuration is removed.
Correct. Static NAT entries are permanent and do not age out.
- C
It requires the use of an access list to define which traffic is translated.
Why wrong: Access lists are used with dynamic NAT, not static NAT.
- D
It translates only TCP and UDP traffic by default.
Why wrong: Static NAT translates all IP traffic, not only TCP and UDP.
Question 1,156 of 2,152
300-410 NAT and PAT Practice Question
This 300-410 practice question tests your understanding of nat and pat. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which statement accurately describes the behavior of the ip nat inside source static command when configuring static NAT for a single inside host?
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
✓
It creates a permanent mapping that remains in the NAT table until the configuration is removed.
The `ip nat inside source static` command creates a permanent one-to-one mapping between an inside local IP address and an inside global IP address. This static entry remains in the NAT table indefinitely until the administrator explicitly removes it with the `no ip nat inside source static` command, making option B correct.
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.
- ✗
It dynamically allocates the global address from a pool and removes the entry after an idle timeout.
Why it's wrong here
This describes dynamic NAT, not static NAT.
- ✓
It creates a permanent mapping that remains in the NAT table until the configuration is removed.
Why this is correct
Correct. Static NAT entries are permanent and do not age out.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
It requires the use of an access list to define which traffic is translated.
Why it's wrong here
Access lists are used with dynamic NAT, not static NAT.
- ✗
It translates only TCP and UDP traffic by default.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that static NAT requires an access list or that it behaves like dynamic NAT with timeouts, leading candidates to incorrectly choose options A or C.
Detailed technical explanation
How to think about this question
Under the hood, the `ip nat inside source static` command installs a permanent entry in the Cisco NAT translation table, which is consulted for every packet arriving on the inside interface destined for the outside. This static binding ensures bidirectional communication without the need for stateful inspection or timers, which is critical for servers that must be reachable from the outside on any protocol (e.g., ICMP ping, GRE tunnels). In real-world scenarios, this is commonly used to map a public IP to an internal mail or web server, guaranteeing that the translation never times out.
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 300-410 question test?
NAT and PAT — This question tests NAT and PAT — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: It creates a permanent mapping that remains in the NAT table until the configuration is removed. — The `ip nat inside source static` command creates a permanent one-to-one mapping between an inside local IP address and an inside global IP address. This static entry remains in the NAT table indefinitely until the administrator explicitly removes it with the `no ip nat inside source static` command, making option B correct.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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