Question 1,722 of 2,152

NAT and PAT →hardMultiple SelectObjective-mapped

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.

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 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.)

Question 1hardmulti select

Study the full ACL explanation →

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.

Full breakdown with real-world context →

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.

Route maps used with NAT allow granular control based on match criteria. The 'match ip address' references an ACL for source IP, and the 'match interface' can be used to match the outgoing interface. The route map is evaluated per packet, not per session, and the 'ip nat inside source' command does not support 'match ip next-hop' or 'set ip next-hop'.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

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.
Why this is correct
Correct. 'match ip address' references an ACL that selects source IPs for NAT.
Related concept
Static NAT maps one inside address to one outside address.
✓
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
Static NAT maps one inside address to one outside address.
✗
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: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Detailed technical explanation

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

Identify inside and outside interfaces first.
Check whether the scenario needs static NAT, dynamic NAT or PAT.
Do not confuse NAT matching ACLs with normal packet-filtering intent.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

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.

What to study next

Got this wrong? Here's your next step.

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.

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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 — Static NAT maps one inside address to one outside address..

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. — Route maps used with NAT allow granular control based on match criteria. The 'match ip address' references an ACL for source IP, and the 'match interface' can be used to match the outgoing interface. The route map is evaluated per packet, not per session, and the 'ip nat inside source' command does not support 'match ip next-hop' or 'set ip next-hop'.

What should I do if I get this 300-410 question wrong?

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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