The correct answer is to add static NAT for the server while continuing PAT for user browsing, because these two techniques solve fundamentally different problems. PAT (Port Address Translation) allows many internal hosts to share a single public IP for outbound connections by multiplexing on port numbers, but it cannot provide a predictable, fixed public address for inbound traffic. Static NAT creates a permanent one-to-one mapping between a private server IP and a specific public IP, ensuring outside clients can always reach the internal web server on that address. On the CCNA 200-301 v2 exam, this distinction tests your understanding of NAT design principles—specifically that PAT is for many-to-one outbound access, while static NAT is for one-to-one inbound access. A common trap is thinking you can use PAT alone for a server, but that fails because PAT does not guarantee a stable public endpoint for unsolicited inbound connections. Remember the mnemonic: “PAT for the crowd, static for the server.”
CCNA Network Services and Security Practice Question
This 200-301 practice question tests your understanding of network services and security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: network Address Translation (NAT) translates private IP addresses to public IP addresses to enable communication between internal hosts and the Internet.. 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.
Users on the inside network can browse the Internet through PAT, but an internal web server must now be reachable from outside on a predictable public IP. Which change best fits the requirement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add static NAT for the server and continue using PAT for user browsing.
The best change is to add a static NAT mapping for the internal web server while keeping PAT in place for ordinary users. In practical terms, PAT is excellent for many internal clients sharing one public address for outbound traffic, but it does not give an internal server the stable one-to-one public identity that outside clients expect for predictable inbound access.
This is a standard NAT design distinction. User browsing and published server access are different requirements, and the best design often uses PAT for one and static NAT for the other.
Key principle: Network Address Translation (NAT) translates private IP addresses to public IP addresses to enable communication between internal hosts and the Internet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Add static NAT for the server and continue using PAT for user browsing.
Why this is correct
This is correct because static NAT gives the server a stable public identity while PAT still serves outbound users.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Network Address Translation (NAT) translates private IP addresses to public IP addresses to enable communication between internal hosts and the Internet.
✗
Replace PAT entirely with DHCP relay.
Why it's wrong here
This is wrong because DHCP relay is unrelated to Internet publishing of an internal server.
When this WOULD be correct
In a scenario where a network is configured to use DHCP for assigning IP addresses to devices, and there is a need to allow external clients to access a specific server without using NAT, a question might ask how to configure the network to allow external access while maintaining DHCP functionality. In that case, replacing PAT with DHCP relay could be the correct answer.
✗
Disable NAT because the server already has a private address.
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 a question asks about a network configuration where all internal devices need to communicate directly with each other without any address translation, disabling NAT could be the correct answer to simplify the network and avoid unnecessary complexity.
✗
Move the server into the native VLAN.
Why it's wrong here
This is wrong because native VLAN assignment does not publish a server to the Internet.
When this WOULD be correct
In a scenario where the question specifies that the server needs to be accessible by internal users only and that VLAN configurations are being reviewed for internal traffic optimization, moving the server into the native VLAN could enhance internal communication without requiring NAT.
Option-by-option analysis
Why each answer is right or wrong
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.
✓Add static NAT for the server and continue using PAT for user browsing.Correct answer▾
Why this is correct
This is correct because static NAT gives the server a stable public identity while PAT still serves outbound users.
✗Replace PAT entirely with DHCP relay.Wrong answer — click to see why▾
Why this is wrong here
Replacing PAT with DHCP relay does not address the requirement of making an internal web server reachable from the outside. DHCP relay is used for forwarding DHCP requests and does not facilitate NAT or public IP address assignment.
★ When this WOULD be the correct answer
In a scenario where a network is configured to use DHCP for assigning IP addresses to devices, and there is a need to allow external clients to access a specific server without using NAT, a question might ask how to configure the network to allow external access while maintaining DHCP functionality. In that case, replacing PAT with DHCP relay could be the correct answer.
Why candidates choose this
Candidates may confuse the need for external access with the need for IP address management, leading them to believe that DHCP relay could somehow facilitate external connectivity, despite it being unrelated to NAT functions.
✗Disable NAT because the server already has a private address.Wrong answer — click to see why▾
Why this is wrong here
Disabling NAT would prevent the internal web server from being accessible from the outside, as it would eliminate the necessary translation of the private IP to a public IP, which is required for external access.
★ When this WOULD be the correct answer
In a scenario where a question asks about a network configuration where all internal devices need to communicate directly with each other without any address translation, disabling NAT could be the correct answer to simplify the network and avoid unnecessary complexity.
Why candidates choose this
Candidates may be tempted by this option because they might believe that since the server has a private address, it can be accessed directly without NAT, overlooking the requirement for external accessibility.
✗Move the server into the native VLAN.Wrong answer — click to see why▾
Why this is wrong here
Moving the server into the native VLAN does not address the requirement for external accessibility via a predictable public IP. The server would still need static NAT to be reachable from the outside, regardless of its VLAN placement.
★ When this WOULD be the correct answer
In a scenario where the question specifies that the server needs to be accessible by internal users only and that VLAN configurations are being reviewed for internal traffic optimization, moving the server into the native VLAN could enhance internal communication without requiring NAT.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of VLANs and their role in network segmentation, believing that simply changing VLANs can resolve accessibility issues without considering NAT requirements.
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
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is selecting DHCP relay or VLAN changes as solutions for making an internal server reachable from outside. DHCP relay only forwards DHCP requests across subnets and does not provide any public IP mapping or NAT functionality. Similarly, moving a server into the native VLAN does not affect its public IP address or NAT translation. Another common mistake is disabling NAT entirely, which breaks Internet connectivity because private IP addresses cannot be routed on the public Internet. Understanding that static NAT is required for predictable inbound access while PAT supports outbound user browsing is critical to avoid these traps.
Detailed technical explanation
How to think about this question
Network Address Translation (NAT) is a fundamental IP service that enables devices on a private network to communicate with external networks by translating private IP addresses to public IP addresses. PAT, a form of dynamic NAT, allows multiple internal hosts to share a single public IP address by using different source port numbers for each session. This is efficient for outbound traffic but does not provide a fixed public IP for inbound connections, which is necessary for hosting services like web servers.
Static NAT differs by establishing a permanent one-to-one mapping between an internal private IP address and a public IP address. This ensures that external clients can reliably reach the internal server using a predictable public IP. In Cisco environments, static NAT is configured to maintain this stable mapping, while PAT continues to serve outbound user traffic. This design balances the need for many users to access the Internet with the requirement for a server to be reachable from outside.
A common exam trap is confusing DHCP relay or VLAN assignments with NAT functionality. DHCP relay only forwards DHCP requests and does not affect NAT or Internet accessibility. Similarly, moving a server to the native VLAN does not influence its public IP mapping or NAT behavior. Disabling NAT altogether is incorrect because private IP addresses are not routable on the Internet, making static NAT essential for inbound access to internal servers.
KKey Concepts to Remember
Network Address Translation (NAT) translates private IP addresses to public IP addresses to enable communication between internal hosts and the Internet.
Port Address Translation (PAT) allows multiple internal hosts to share a single public IP address by differentiating sessions using unique source port numbers.
Static NAT creates a one-to-one mapping between a private IP address and a public IP address, providing a stable public identity for internal servers.
PAT is ideal for outbound traffic from many internal users but does not support predictable inbound access to internal servers from the Internet.
Static NAT enables external clients to reach internal servers using a consistent public IP address, which is essential for hosting services like web servers.
Disabling NAT on private IP addresses prevents Internet communication because private addresses are not routable on the public Internet.
DHCP relay is used to forward DHCP requests across different subnets and does not affect NAT or Internet accessibility of internal servers.
Assigning a server to a native VLAN does not influence its public accessibility or NAT behavior and is unrelated to Internet publishing.
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
Network Address Translation (NAT) translates private IP addresses to public IP addresses to enable communication between internal hosts and the Internet.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 200-301 question in full detail.
Review network Address Translation (NAT) translates private IP addresses to public IP addresses to enable communication between internal hosts and the Internet., then practise related 200-301 questions on the same topic to reinforce the concept.
Network Services and Security — This question tests Network Services and Security — Network Address Translation (NAT) translates private IP addresses to public IP addresses to enable communication between internal hosts and the Internet..
What is the correct answer to this question?
The correct answer is: Add static NAT for the server and continue using PAT for user browsing. — The best change is to add a static NAT mapping for the internal web server while keeping PAT in place for ordinary users. In practical terms, PAT is excellent for many internal clients sharing one public address for outbound traffic, but it does not give an internal server the stable one-to-one public identity that outside clients expect for predictable inbound access.
This is a standard NAT design distinction. User browsing and published server access are different requirements, and the best design often uses PAT for one and static NAT for the other.
What should I do if I get this 200-301 question wrong?
Review network Address Translation (NAT) translates private IP addresses to public IP addresses to enable communication between internal hosts and the Internet., then practise related 200-301 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Network Address Translation (NAT) translates private IP addresses to public IP addresses to enable communication between internal hosts and the Internet.
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