- A
The route map can use 'match ip address' to select traffic for translation based on source IP.
Correct. 'match ip address' references an ACL that selects source IPs for NAT.
- B
The route map can use 'match interface' to translate only when traffic exits a specific interface.
Correct. 'match interface' in a NAT route map restricts translation to traffic exiting that interface.
- C
The route map can use 'match ip next-hop' to control translation based on the next-hop IP.
Why wrong: Incorrect. 'match ip next-hop' is not supported in NAT route maps; it is used in PBR route maps.
- D
The route map is evaluated once per session at the creation of the translation entry.
Why wrong: Incorrect. The route map is evaluated for every packet, not just at session creation.
- E
The route map can use 'set ip next-hop' to change the destination of translated packets.
Why wrong: Incorrect. 'set ip next-hop' is not supported in NAT route maps; it is used in PBR.
Using Route Maps with NAT
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 TWO statements correctly describe the behavior of NAT with route maps and ACLs when using the 'ip nat inside source route-map' feature? (Choose TWO.)
Quick Answer
The answer is that the route map can use 'match interface' to translate only when traffic exits a specific interface. This is correct because the 'ip nat inside source route-map' feature evaluates the route map on a per-packet basis, and when 'match interface' is configured, NAT translation occurs only if the packet’s outgoing interface matches the one specified in the route map, allowing precise control over which traffic is translated based on egress path. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of how route maps interact with NAT beyond simple ACL matching—a common trap is confusing per-packet evaluation with per-session behavior, or assuming that 'match ip next-hop' is supported in this context. Remember that 'match interface' ties translation to the exit interface, not the next-hop IP. A useful memory tip: think of it as “exit to translate”—if the packet doesn’t leave through the matched interface, no translation occurs.
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 route map can use 'match ip address' to select traffic for translation based on source IP.
Option A is correct because the 'match ip address' command in a route map references an ACL that selects traffic based on source IP address. When used with 'ip nat inside source route-map', only packets matching the ACL are considered for NAT translation, allowing granular control over which inside hosts are translated.
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 route map can use 'match ip address' to select traffic for translation based on source IP.
- ✓
The route map can use 'match interface' to translate only when traffic exits a specific interface.
Why this is correct
Correct. 'match interface' in a NAT route map restricts translation to traffic exiting that interface.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The route map can use 'match ip next-hop' to control translation based on the next-hop IP.
Why it's wrong here
Incorrect. 'match ip next-hop' is not supported in NAT route maps; it is used in PBR route maps.
- ✗
The route map is evaluated once per session at the creation of the translation entry.
Why it's wrong here
Incorrect. The route map is evaluated for every packet, not just at session creation.
- ✗
The route map can use 'set ip next-hop' to change the destination of translated packets.
Why it's wrong here
Incorrect. 'set ip next-hop' is not supported in NAT route maps; it is used in PBR.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that route-map match clauses like 'match ip next-hop' or 'set ip next-hop' are valid for NAT, when in fact they belong to PBR and have no effect on NAT translation decisions.
Detailed technical explanation
How to think about this question
The 'ip nat inside source route-map' feature allows dynamic NAT policies where translation occurs only if the route-map conditions are met. Under the hood, the route map is applied to the inside-to-outside traffic flow; if the route map returns 'permit', the source IP is translated according to the NAT pool or interface, and if 'deny', the packet is not translated. A subtle behavior is that the route map can also use 'match interface' to translate only when the packet exits a specific outside interface, which is useful for multi-homed scenarios where you want different translation behavior per egress path.
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: The route map can use 'match ip address' to select traffic for translation based on source IP. — Option A is correct because the 'match ip address' command in a route map references an ACL that selects traffic based on source IP address. When used with 'ip nat inside source route-map', only packets matching the ACL are considered for NAT translation, allowing granular control over which inside hosts are translated.
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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