- A
show ip nat translations
Displays active translations, which helps verify if mappings are created correctly.
- B
debug ip nat
Provides real-time output of NAT translation events, useful for seeing if packets are being translated.
- C
clear ip nat translation
Clears dynamic translations, which can resolve stuck entries or test new configurations.
- D
show ip nat verbose
Why wrong: Not a valid Cisco IOS command; the verbose option is used with show ip nat translations.
- E
show ip interface brief
Why wrong: Shows interface status and IP addresses, but does not provide NAT-specific information.
Question 342 of 2,152
Essential NAT Troubleshooting Commands
This 300-410 practice question tests your understanding of nat and pat. 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.
Which THREE commands can be used to troubleshoot NAT issues on a Cisco IOS router? (Choose THREE.)
Quick Answer
The answer is show ip nat translations, debug ip nat, and clear ip nat translation. These three commands form the core toolkit for NAT troubleshooting because they allow you to verify active translations, monitor translation events in real time, and reset problematic entries that may be causing connectivity failures. On the Cisco CCNP ENARSI 300-410 exam, this topic tests your ability to isolate NAT-related issues in complex enterprise networks, often presented as a multiple-select question where distractors include non-existent commands like clear ip nat statistics or show ip nat statistics. A common trap is confusing debug ip nat with debug ip nat translations, but only the former is valid. For a quick memory tip, remember the triad: show to see, debug to track, clear to reset.
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
✓
show ip nat translations
A is correct because 'show ip nat translations' displays the current NAT translation table, showing inside local, inside global, outside local, and outside global addresses. This command is essential for verifying whether translations are being created correctly and for identifying translation mismatches or exhaustion.
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.
- ✓
show ip nat translations
Why this is correct
Displays active translations, which helps verify if mappings are created correctly.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
debug ip nat
Why this is correct
Provides real-time output of NAT translation events, useful for seeing if packets are being translated.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
clear ip nat translation
Why this is correct
Clears dynamic translations, which can resolve stuck entries or test new configurations.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
show ip nat verbose
Why it's wrong here
Not a valid Cisco IOS command; the verbose option is used with show ip nat translations.
- ✗
show ip interface brief
Why it's wrong here
Shows interface status and IP addresses, but does not provide NAT-specific information.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between valid troubleshooting commands and commands that sound plausible but are either nonexistent or irrelevant to the specific technology, such as 'show ip nat verbose' or 'show ip interface brief'.
Trap categories for this question
Command / output trap
Not a valid Cisco IOS command; the verbose option is used with show ip nat translations.
Detailed technical explanation
How to think about this question
Under the hood, NAT translations are stored in a hash table keyed by protocol, inside global IP:port, and outside global IP:port. The 'debug ip nat' command logs translation events in real time, which can reveal packet drops due to ACL misconfigurations or PAT port exhaustion. In real-world scenarios, combining 'show ip nat translations' with 'debug ip nat' helps isolate asymmetric routing problems where return traffic bypasses the NAT device.
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
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.
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NAT and PAT — study guide chapter
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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: show ip nat translations — A is correct because 'show ip nat translations' displays the current NAT translation table, showing inside local, inside global, outside local, and outside global addresses. This command is essential for verifying whether translations are being created correctly and for identifying translation mismatches or exhaustion.
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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