The correct answer is that incoming traffic to 198.51.100.10:8080 is forwarded to 10.0.0.10:80. This static NAT port forwarding configuration maps an inside local host and port to a specific outside global address and port, and the `extendable` keyword permits multiple static translations to share the same outside IP address by allowing the router to create additional NAT entries as needed. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of how static NAT with port forwarding differs from dynamic NAT, and the `extendable` keyword is a common trap—many candidates mistakenly think it is only for dynamic translations or that it disables port forwarding. Remember the memory tip: “extendable extends the pool of translations, not the port range,” so think of it as enabling multiple inside hosts to use the same outside IP by differentiating on port numbers.
300-410 NAT and PAT Practice Question
This 300-410 practice question tests your understanding of nat and pat. 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.
Examine this configuration:
interface GigabitEthernet0/0
ip address 10.0.0.1 255.255.255.0
ip nat inside
!
interface GigabitEthernet0/1
ip address 198.51.100.1 255.255.255.0
ip nat outside
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Incoming traffic to 198.51.100.10:8080 is forwarded to 10.0.0.10:80.
This is a static NAT for TCP port 80 on inside host 10.0.0.10 to outside address 198.51.100.10 port 8080. The 'extendable' keyword allows multiple static translations to the same outside IP.
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.
✗
All traffic from 10.0.0.10 is translated to 198.51.100.10.
Why it's wrong here
Only TCP port 80 is translated; other ports are not affected.
✓
Incoming traffic to 198.51.100.10:8080 is forwarded to 10.0.0.10:80.
Why this is correct
Static NAT/PAT maps the outside address/port to the inside address/port bidirectionally.
Related concept
Static NAT maps one inside address to one outside address.
✗
The 'extendable' keyword is invalid for static NAT.
Why it's wrong here
'extendable' is valid and allows overlapping static translations.
✗
This translation will not work unless 'ip nat inside source list' is also configured.
Why it's wrong here
Static NAT is independent and does not require a dynamic NAT rule.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
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.
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: Incoming traffic to 198.51.100.10:8080 is forwarded to 10.0.0.10:80. — This is a static NAT for TCP port 80 on inside host 10.0.0.10 to outside address 198.51.100.10 port 8080. The 'extendable' keyword allows multiple static translations to the same outside IP.
What should I do if I get this 300-410 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 300-410 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which statement accurately describes the behavior of the ip nat inside source static command when configuring static NAT for a single inside host?
easy
A.It dynamically allocates the global address from a pool and removes the entry after an idle timeout.
✓ B.It creates a permanent mapping that remains in the NAT table until the configuration is removed.
C.It requires the use of an access list to define which traffic is translated.
D.It translates only TCP and UDP traffic by default.
Why B: The ip nat inside source static command creates a permanent one-to-one mapping between an inside local IP address and an inside global IP address. This translation is always present in the NAT table and does not time out.
Last reviewed: Jun 19, 2026
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