- A
'show ip nat translations'
Correct. This shows the current NAT table, including inside local, inside global, outside local, and outside global addresses and ports.
- B
'debug ip nat detailed'
Correct. This debug provides detailed information about each packet being translated, including application-layer changes.
- C
'show ip nat statistics'
Why wrong: Incorrect. This shows hit counts and configuration summary, not per-translation details needed for application failure analysis.
- D
'show ip access-lists'
Why wrong: Incorrect. This shows ACL entries and matches, not NAT translations.
- E
'show running-config | include nat'
Why wrong: Incorrect. This shows the NAT configuration, not the operational translations or debug output.
Question 531 of 2,152
Troubleshooting PAT for Application Failures
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.
An engineer is troubleshooting a PAT overload configuration on a Cisco router. Inside hosts can access the Internet, but some applications (e.g., FTP, SIP) fail. Which TWO commands can be used to verify the NAT translations and identify the issue? (Choose TWO.)
Quick Answer
The answer is **show ip nat translations** and **debug ip nat detailed**. The first command displays active NAT entries with port numbers, allowing you to verify whether PAT is correctly allocating unique ports for each session; if translations are missing or ports are exhausted, FTP and SIP will fail. The second command provides real-time, packet-level translation details, revealing how the router handles application-layer protocols like FTP’s active mode or SIP’s control and media streams. On the Cisco CCNP ENARSI 300-410 exam, this question tests your ability to distinguish between verification commands and configuration-only or summary commands—a common trap is choosing **show ip nat statistics**, which shows counts but not per-flow port mappings, or **show running-config**, which only confirms the NAT configuration exists. Remember the memory tip: “Translations show the map, debug shows the trip”—use **show** to see the current state and **debug** to watch the process in action.
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'
The 'show ip nat translations' command displays the current NAT translation table, including inside local, inside global, outside local, and outside global addresses. This allows the engineer to verify whether translations are being created correctly for protocols like FTP and SIP, which may fail due to missing or incorrect translations, especially when PAT overload is used and application-layer gateways (ALGs) are not handling embedded IP addresses or ports properly.
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
Correct. This shows the current NAT table, including inside local, inside global, outside local, and outside global addresses and ports.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
'debug ip nat detailed'
Why this is correct
Correct. This debug provides detailed information about each packet being translated, including application-layer changes.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
'show ip nat statistics'
Why it's wrong here
Incorrect. This shows hit counts and configuration summary, not per-translation details needed for application failure analysis.
- ✗
'show ip access-lists'
- ✗
'show running-config | include nat'
Why it's wrong here
Incorrect. This shows the NAT configuration, not the operational translations or debug output.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between commands that show configuration versus commands that show operational state; the trap here is that candidates may pick 'show running-config | include nat' thinking it reveals translation issues, but it only shows static configuration, not dynamic translations or real-time failures.
Trap categories for this question
Command / output trap
Incorrect. This shows hit counts and configuration summary, not per-translation details needed for application failure analysis.
Detailed technical explanation
How to think about this question
PAT overload (also known as NAT overload or NAPT) translates multiple inside hosts to a single public IP address by multiplexing on source ports. For protocols like FTP (which uses separate control and data channels) and SIP (which embeds IP addresses and ports in the payload), the router must perform application-level gateway (ALG) functions to rewrite the payload; if the ALG is misconfigured or unsupported, translations may fail even though basic connectivity works. The 'debug ip nat detailed' command reveals these translation events, including failures in ALG processing, port allocation issues, or timeouts, which are invisible in summary statistics.
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.
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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' — The 'show ip nat translations' command displays the current NAT translation table, including inside local, inside global, outside local, and outside global addresses. This allows the engineer to verify whether translations are being created correctly for protocols like FTP and SIP, which may fail due to missing or incorrect translations, especially when PAT overload is used and application-layer gateways (ALGs) are not handling embedded IP addresses or ports properly.
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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