Quick Answer
The answer is static NAT. This is the correct choice because it establishes a permanent one-to-one mapping between a single inside private IP address and a single outside public IP address, ensuring that the internal server is always reachable from the internet using the same public address. For the CCNA 200-301 v2 exam, this question tests your understanding of when to use static NAT versus dynamic NAT or PAT; a common trap is confusing static NAT with PAT, but remember that PAT is designed for many-to-one outbound translation, not for providing a fixed external identity for inbound server access. The exam often presents a scenario where a server must be consistently reachable from outside, and the key differentiator is the need for a permanent, unchanging public address. A useful memory tip is to think of “static” as “stuck” — the public IP is stuck to that one server, just like a dedicated parking spot reserved for one car.
This 200-301 practice question tests your understanding of network services and security. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. A key principle to apply: static NAT creates a fixed one-to-one mapping between a private internal IP address and a public external IP address for consistent external reachability.. 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.
An internal server must always be reachable from outside using the same public IP address. Which translation approach is most appropriate?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "always"
Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
Static NAT
This is correct because static NAT creates a fixed public-to-private mapping for the server.
PAT overload
Why wrong: This is wrong because PAT is mainly for many outbound sessions sharing fewer public addresses.
No NAT
Why wrong: This is wrong because private IPv4 addresses are not Internet-routable.
DHCP relay
Why wrong: This is wrong because DHCP relay is unrelated to outside reachability for a server.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Static NAT
A static NAT mapping is the most appropriate approach. In plain language, the outside world needs a stable public address that always represents the same internal server. Static NAT provides that fixed one-to-one relationship, which makes the service reachable predictably. PAT is better suited for many outbound users sharing one public address, not for presenting one inside server with a consistent external identity. The correct answer is the one that provides a permanent mapping.
Key principle: Static NAT creates a fixed one-to-one mapping between a private internal IP address and a public external IP address for consistent external reachability.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Static NAT
Why this is correct
This is correct because static NAT creates a fixed public-to-private mapping for the server.
Clue confirmation
The clue word "always" in the question point toward this answer.
Related concept
Static NAT creates a fixed one-to-one mapping between a private internal IP address and a public external IP address for consistent external reachability.
PAT overload
Why it's wrong here
This is wrong because PAT is mainly for many outbound sessions sharing fewer public addresses.
When this WOULD be correct
If the question stated that multiple internal servers need to be accessible from the outside using a single public IP address, and the focus was on conserving IP addresses while allowing multiple connections, PAT overload would be the correct answer. This would apply in scenarios where port numbers can differentiate between connections.
No NAT
Why it's wrong here
This is wrong because private IPv4 addresses are not Internet-routable.
When this WOULD be correct
In a scenario where the question asks for a method to connect internal devices directly to the internet without any IP address translation, 'No NAT' would be the correct answer. This could involve a setup where all devices are assigned public IPs directly, eliminating the need for NAT.
DHCP relay
Why it's wrong here
This is wrong because DHCP relay is unrelated to outside reachability for a server.
When this WOULD be correct
If the question asked about ensuring that DHCP clients can receive IP addresses from a remote DHCP server while maintaining connectivity across different subnets, DHCP relay would be the correct answer. This scenario would focus on the management of IP address assignment rather than NAT.
Option-by-option analysis
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
Why this is correct
This is correct because static NAT creates a fixed public-to-private mapping for the server.
Why this is wrong here
PAT (Port Address Translation) overload uses a single public IP address for multiple internal hosts by differentiating sessions via port numbers. It does not provide a fixed public-to-private mapping, so an external host cannot consistently reach a specific internal server using the same public IP and port without additional configuration like port forwarding, which is not the same as static NAT.
★ When this WOULD be the correct answer
If the question stated that multiple internal servers need to be accessible from the outside using a single public IP address, and the focus was on conserving IP addresses while allowing multiple connections, PAT overload would be the correct answer. This would apply in scenarios where port numbers can differentiate between connections.
Why candidates choose this
Students might confuse PAT with static NAT because both involve translating private addresses to public ones. However, PAT is primarily designed for many-to-one outbound translations, not for providing a fixed inbound mapping for a server.
Why this is wrong here
No NAT means the server would use its private IP address directly, but private IPv4 addresses (e.g., 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) are not routable on the public internet. Therefore, the server would not be reachable from outside without address translation.
★ When this WOULD be the correct answer
In a scenario where the question asks for a method to connect internal devices directly to the internet without any IP address translation, 'No NAT' would be the correct answer. This could involve a setup where all devices are assigned public IPs directly, eliminating the need for NAT.
Why candidates choose this
Some students might think that if a server is directly connected to the internet with a public IP, no NAT is needed. However, the question specifies an internal server, implying it uses a private IP, so translation is required.
Why this is wrong here
DHCP relay is used to forward DHCP broadcast messages between clients and servers across different subnets. It has no role in providing external reachability or IP address translation for a server.
★ When this WOULD be the correct answer
If the question asked about ensuring that DHCP clients can receive IP addresses from a remote DHCP server while maintaining connectivity across different subnets, DHCP relay would be the correct answer. This scenario would focus on the management of IP address assignment rather than NAT.
Why candidates choose this
The term 'relay' might be confused with 'translation' or 'forwarding' in the context of network address translation. However, DHCP relay is a completely different function related to IP address assignment, not persistent external access.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
A common exam trap is selecting PAT overload instead of static NAT for a server that must be reachable from outside using the same public IP. PAT overload is designed for many internal hosts sharing a single public IP for outbound connections, not for providing a fixed public IP for inbound access. This misunderstanding leads to incorrect assumptions about how inbound traffic is handled. The exam tests your ability to distinguish between dynamic port-based translation and static one-to-one mappings, so confusing these concepts can cause you to choose the wrong NAT approach.
Detailed technical explanation
Network Address Translation (NAT) is a fundamental IP service that modifies IP address information in packet headers while in transit across a routing device. Static NAT creates a permanent one-to-one mapping between a private internal IP address and a public external IP address. This ensures that the internal server is always reachable via the same public IP, which is essential for hosting services accessible from outside the network. When deciding the appropriate NAT approach, static NAT is chosen for servers requiring consistent external accessibility because it guarantees a fixed public-to-private IP mapping. In contrast, Port Address Translation (PAT) overload allows multiple internal devices to share a single public IP by differentiating sessions with port numbers, which is unsuitable for inbound connections targeting a specific server. DHCP relay and no NAT do not provide the necessary address translation or external reachability for private IP addresses. A common exam trap is confusing PAT overload with static NAT. PAT is often used for outbound traffic from multiple hosts sharing one public IP, but it does not provide a stable public IP for inbound connections to a single internal server. Understanding this distinction is critical for the CCNA exam and real-world network design, where predictable external access to internal resources is required.
Key takeaway
Static NAT creates a fixed one-to-one mapping between a private internal IP address and a public external IP address for consistent external reachability.
Real-world example
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
Review static NAT creates a fixed one-to-one mapping between a private internal IP address and a public external IP address for consistent external reachability., then practise related 200-301 questions on the same topic to reinforce the concept.
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FAQ
Network Services and Security — This question tests Network Services and Security — Static NAT creates a fixed one-to-one mapping between a private internal IP address and a public external IP address for consistent external reachability..
The correct answer is: Static NAT — A static NAT mapping is the most appropriate approach. In plain language, the outside world needs a stable public address that always represents the same internal server. Static NAT provides that fixed one-to-one relationship, which makes the service reachable predictably. PAT is better suited for many outbound users sharing one public address, not for presenting one inside server with a consistent external identity. The correct answer is the one that provides a permanent mapping.
Review static NAT creates a fixed one-to-one mapping between a private internal IP address and a public external IP address for consistent external reachability., then practise related 200-301 questions on the same topic to reinforce the concept.
Yes — watch for: "always". Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
Static NAT creates a fixed one-to-one mapping between a private internal IP address and a public external IP address for consistent external reachability.
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Last reviewed: May 17, 2026
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