- A
The third translation is not using PAT, indicating a possible ACL or route-map misconfiguration.
The overload configuration should create PAT entries with protocol/port. The third entry without protocol suggests the traffic from 10.0.0.11 is not being matched by the same ACL or is using a different pool.
- B
The pool is exhausted because 192.0.2.10 is used twice.
Why wrong: PAT allows multiple inside hosts to share the same global address; this is normal. Exhaustion would occur if all pool addresses were used without overload.
- C
The outside interface is misconfigured as inside.
Why wrong: The statistics show correct interface assignment.
- D
The NAT translations are all static.
Why wrong: The statistics clearly show 0 static translations.
Question 1,195 of 2,152
Show IP NAT Translations
This 300-410 practice question tests your understanding of nat and pat. 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 udp 192.0.2.10:1234 10.0.0.10:1234 203.0.113.5:53 203.0.113.5:53 tcp 192.0.2.10:5678 10.0.0.10:5678 198.51.100.20:80 198.51.100.20:80 --- 192.0.2.11 10.0.0.11 --- ---
R1# show ip nat statistics
Total active translations: 3 (0 static, 3 dynamic; 3 extended) Outside interfaces: GigabitEthernet0/1 Inside interfaces: GigabitEthernet0/0 Hits: 100 Misses: 0 CEF Translated packets: 100, CEF Punted packets: 0 Expired translations: 0 Dynamic mappings: -- Inside Source
[Id] ip nat pool POOL1 192.0.2.10 192.0.2.20 netmask 255.255.255.240
refcount 3 map-id 1 overload
[Id] ip nat inside source list ACL1 pool POOL1 overload
refcount 3
Based on this output, what is the problem?
Quick Answer
The answer is a possible ACL or route-map misconfiguration causing the third translation to use basic NAT instead of PAT. The output shows two PAT translations for 10.0.0.10, both using the same inside global address 192.0.2.10 with protocol and port numbers, while the third entry for 10.0.0.11 lacks a protocol column, indicating a one-to-one dynamic NAT translation that does not leverage port address translation. This inconsistency with the configured `overload` keyword on the pool suggests that traffic from 10.0.0.11 is not being matched by ACL1 or is being caught by a route-map that disables PAT for that specific flow. On the CCNP ENARSI 300-410 exam, this scenario tests your ability to interpret `show ip nat translations` mixed PAT and basic NAT entries, a common trap where candidates overlook the missing protocol field as a sign of misconfiguration. Remember the memory tip: “No protocol, no overload—check your ACL or route-map for the missing fold.”
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 third translation is not using PAT, indicating a possible ACL or route-map misconfiguration.
The third translation lacks a protocol and port number, meaning it is a simple dynamic NAT entry without Port Address Translation (PAT). Since the pool is configured with the `overload` keyword, all translations should use PAT to share the pool addresses. The presence of a non-PAT translation indicates that the ACL or route-map used to match traffic for NAT is misconfigured, causing some traffic to be translated without port multiplexing.
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.
- ✓
The third translation is not using PAT, indicating a possible ACL or route-map misconfiguration.
- ✗
The pool is exhausted because 192.0.2.10 is used twice.
Why it's wrong here
PAT allows multiple inside hosts to share the same global address; this is normal. Exhaustion would occur if all pool addresses were used without overload.
- ✗
The outside interface is misconfigured as inside.
Why it's wrong here
The statistics show correct interface assignment.
- ✗
The NAT translations are all static.
Why it's wrong here
The statistics clearly show 0 static translations.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between simple NAT and PAT by showing a translation entry without ports, leading candidates to incorrectly assume the pool is exhausted or that static NAT is in use, when the real issue is a misconfigured ACL or route-map that allows non-PAT traffic.
Trap categories for this question
Command / output trap
The statistics show correct interface assignment.
Detailed technical explanation
How to think about this question
When NAT overload (PAT) is configured, the router creates extended translations that include protocol and port numbers to multiplex multiple inside hosts to a single public IP. A simple translation (no protocol/port) indicates that the traffic matched a NAT rule without the `overload` keyword or that the ACL permitted traffic that did not trigger PAT, such as ICMP or non-TCP/UDP traffic. In this case, the third translation likely corresponds to an ICMP or other protocol that bypasses PAT, revealing an ACL or route-map misconfiguration that fails to restrict NAT to only TCP/UDP traffic.
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: The third translation is not using PAT, indicating a possible ACL or route-map misconfiguration. — The third translation lacks a protocol and port number, meaning it is a simple dynamic NAT entry without Port Address Translation (PAT). Since the pool is configured with the `overload` keyword, all translations should use PAT to share the pool addresses. The presence of a non-PAT translation indicates that the ACL or route-map used to match traffic for NAT is misconfigured, causing some traffic to be translated without port multiplexing.
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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