- A
NAT overload (PAT) allows multiple internal hosts to share a single public IP address by using unique source port numbers.
Correct because PAT uses port multiplexing to distinguish sessions from different internal hosts sharing one global IP.
- B
The ip nat inside source list 1 pool POOL overload command enables dynamic NAT without port translation.
Why wrong: Incorrect because the 'overload' keyword enables PAT (port translation); without it, it is dynamic NAT using a pool one-to-one.
- C
A static NAT entry is created using the ip nat inside source static 192.168.1.10 203.0.113.10 command.
Correct because this command creates a permanent one-to-one mapping from an inside local to an inside global address.
- D
The ip nat outside command is applied to the internal interface to mark it as the source of NAT translations.
Why wrong: Incorrect because ip nat outside is applied to the external interface; ip nat inside is applied to the internal interface.
- E
Dynamic NAT without overload translates multiple inside addresses to a single outside address using port numbers.
Why wrong: Incorrect because dynamic NAT without overload maps inside addresses one-to-one to a pool of global addresses, not using ports.
CCNP NAT and DHCP Practice Question
This 350-401 practice question tests your understanding of nat and dhcp. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 about NAT configuration on Cisco IOS-XE are true? (Choose two.)
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
NAT overload (PAT) allows multiple internal hosts to share a single public IP address by using unique source port numbers.
NAT overload (PAT) translates multiple inside local addresses to a single inside global address using port numbers. The ip nat inside source list command with the overload keyword enables this. The ip nat inside source static command creates a one-to-one mapping, not many-to-one. Dynamic NAT without overload uses a pool of global addresses one-to-one. The ip nat outside command is applied to the external interface, not inside. NAT can translate source addresses for traffic leaving the inside network.
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.
- ✓
NAT overload (PAT) allows multiple internal hosts to share a single public IP address by using unique source port numbers.
- ✗
The ip nat inside source list 1 pool POOL overload command enables dynamic NAT without port translation.
- ✓
A static NAT entry is created using the ip nat inside source static 192.168.1.10 203.0.113.10 command.
Why this is correct
Correct because this command creates a permanent one-to-one mapping from an inside local to an inside global address.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
The ip nat outside command is applied to the internal interface to mark it as the source of NAT translations.
Why it's wrong here
Incorrect because ip nat outside is applied to the external interface; ip nat inside is applied to the internal interface.
- ✗
Dynamic NAT without overload translates multiple inside addresses to a single outside address using port numbers.
Why it's wrong here
Incorrect because dynamic NAT without overload maps inside addresses one-to-one to a pool of global addresses, not using ports.
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.
Trap categories for this question
Keyword trap
Incorrect because the 'overload' keyword enables PAT (port translation); without it, it is dynamic NAT using a pool one-to-one.
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 350-401 NAT questions on configuration and troubleshooting.
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NAT and DHCP — study guide chapter
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FAQ
Questions learners often ask
What does this 350-401 question test?
NAT and DHCP — This question tests NAT and DHCP — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: NAT overload (PAT) allows multiple internal hosts to share a single public IP address by using unique source port numbers. — NAT overload (PAT) translates multiple inside local addresses to a single inside global address using port numbers. The ip nat inside source list command with the overload keyword enables this. The ip nat inside source static command creates a one-to-one mapping, not many-to-one. Dynamic NAT without overload uses a pool of global addresses one-to-one. The ip nat outside command is applied to the external interface, not inside. NAT can translate source addresses for traffic leaving the inside network.
What should I do if I get this 350-401 question wrong?
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 350-401 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 18, 2026
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