- A
Configure ip nat inside source static <inside-local> <inside-global> in global configuration mode.
This command creates a permanent mapping between a private inside address and a public global address.
- B
Apply the ip nat inside command on the interface facing the internal network.
This marks the interface as the inside NAT interface, enabling translation for traffic sourced from or destined to that interface.
- C
Apply the ip nat outside command on the interface facing the internal network.
Why wrong: The outside command should be applied to the interface facing the external network, not the internal one.
- D
Configure an access list to match the inside local addresses for translation.
Why wrong: Access lists are used for dynamic NAT or PAT, not for static NAT, which uses an explicit mapping.
- E
Enable the ip nat service command globally to activate NAT.
Why wrong: There is no such global command; NAT is enabled by configuring translations and interface markings.
Two Steps to Configure Static NAT
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.
Which TWO configuration steps are required to implement static NAT on a Cisco IOS router? (Choose TWO.)
Quick Answer
The answer is applying the ip nat inside command on the interface facing the internal network. This is correct because static NAT requires a one-to-one mapping between an inside local address and an inside global address, and the router must know which interfaces belong to the inside and outside domains to translate packets correctly. The ip nat inside command marks the interface connected to your internal hosts, while ip nat outside marks the interface facing the external network; without both, the router cannot determine where to apply the translation. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of NAT interface roles, often appearing in configuration or troubleshooting scenarios where a missing interface command breaks connectivity. A common trap is assuming the ip nat inside source static command alone is sufficient—it is not; the interface-level commands are mandatory. Memory tip: think of the router as a bouncer—you must tell it which door is the “inside” entrance and which is the “outside” exit for the translation to work.
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
Configure ip nat inside source static <inside-local> <inside-global> in global configuration mode.
Option A is correct because the 'ip nat inside source static' command in global configuration mode defines the static one-to-one mapping between an inside local (private) IP address and an inside global (public) IP address. This is the fundamental configuration step for static NAT, as it creates the permanent translation entry in the NAT table without requiring dynamic address pools or access lists.
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.
- ✓
Configure ip nat inside source static <inside-local> <inside-global> in global configuration mode.
Why this is correct
This command creates a permanent mapping between a private inside address and a public global address.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Apply the ip nat inside command on the interface facing the internal network.
Why this is correct
This marks the interface as the inside NAT interface, enabling translation for traffic sourced from or destined to that interface.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Apply the ip nat outside command on the interface facing the internal network.
Why it's wrong here
The outside command should be applied to the interface facing the external network, not the internal one.
- ✗
Configure an access list to match the inside local addresses for translation.
- ✗
Enable the ip nat service command globally to activate NAT.
Why it's wrong here
There is no such global command; NAT is enabled by configuring translations and interface markings.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that static NAT requires an access list (like dynamic NAT) or that a global 'ip nat service' command must be enabled, when in fact static NAT only needs the static mapping and the correct interface designations (inside/outside).
Trap categories for this question
Command / output trap
The outside command should be applied to the interface facing the external network, not the internal one.
Detailed technical explanation
How to think about this question
Static NAT creates a permanent entry in the NAT translation table, ensuring that a specific inside local address always maps to a specific inside global address, which is essential for servers that must be reachable from the outside with a consistent public IP. Under the hood, the router performs a destination NAT for inbound traffic and a source NAT for outbound traffic, rewriting IP addresses in the packet header and updating checksums (including TCP/UDP checksums) accordingly. In real-world scenarios, static NAT is commonly used to host a web server on a private IP behind a single public IP, allowing external clients to initiate connections to the server.
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: Configure ip nat inside source static <inside-local> <inside-global> in global configuration mode. — Option A is correct because the 'ip nat inside source static' command in global configuration mode defines the static one-to-one mapping between an inside local (private) IP address and an inside global (public) IP address. This is the fundamental configuration step for static NAT, as it creates the permanent translation entry in the NAT table without requiring dynamic address pools or access lists.
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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