CCNA Network Services and Security Practice Question
This 200-301 practice question tests your understanding of network services and security. 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. A key principle to apply: static NAT creates a permanent one-to-one mapping between an inside local IP address and an inside global IP address.. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It creates a permanent one-to-one translation between the inside host and a public address
This command creates a static NAT mapping between one inside local address and one inside global address. In plain language, the internal device at 192.168.1.50 will always appear as 203.0.113.50 to the outside world. That fixed relationship is useful when a particular internal host or service must be reachable consistently from outside networks.
This is different from PAT, which shares one public address across many sessions using ports. Static NAT is one-to-one and predictable. It does not dynamically pull from a pool in this syntax. The key idea is permanence: the same inside device is always mapped to the same outside address.
Key principle: Static NAT creates a permanent one-to-one mapping between an inside local IP address and an inside global IP address.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
It creates a permanent one-to-one translation between the inside host and a public address
Why this is correct
This is correct because static NAT builds a fixed mapping from one inside local address to one inside global address.
Related concept
Static NAT creates a permanent one-to-one mapping between an inside local IP address and an inside global IP address.
✗
It enables PAT overload for all internal users
Why it's wrong here
This is wrong because PAT overload is a many-to-one design and uses different syntax.
When this WOULD be correct
In a different question, if the command were `ip nat inside source list 1 interface Serial0 overload`, it would enable PAT for all internal users, allowing multiple devices to share a single public IP address through port numbers.
✗
It blocks inbound access to the inside host permanently
Why it's wrong here
This is wrong because static NAT does not inherently block outside access.
When this WOULD be correct
If the question were about a firewall configuration that explicitly denies all inbound traffic to a specific host, then stating that it blocks inbound access would be correct. For example, a question could ask about a firewall rule that drops all packets destined for a specific internal IP.
✗
It changes the host subnet mask to a public prefix
Why it's wrong here
This is wrong because NAT translation does not alter the host’s local subnet mask.
When this WOULD be correct
If the question were about a command that explicitly modifies the IP address configuration of a device, such as `ip address 203.0.113.50 255.255.255.0`, then this option would be correct, as it would indicate that the host's subnet mask is being changed to a public prefix.
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.
✓It creates a permanent one-to-one translation between the inside host and a public addressCorrect answer▾
Why this is correct
This is correct because static NAT builds a fixed mapping from one inside local address to one inside global address.
✗It enables PAT overload for all internal usersWrong answer — click to see why▾
Why this is wrong here
This option is incorrect because the command `ip nat inside source static` creates a static NAT entry, not PAT (Port Address Translation), which is used for multiple internal users sharing a single public IP address.
★ When this WOULD be the correct answer
In a different question, if the command were `ip nat inside source list 1 interface Serial0 overload`, it would enable PAT for all internal users, allowing multiple devices to share a single public IP address through port numbers.
Why candidates choose this
Candidates may confuse static NAT with PAT due to their similar purposes in network address translation, leading them to incorrectly assume that the command enables overload for multiple users.
✗It blocks inbound access to the inside host permanentlyWrong answer — click to see why▾
Why this is wrong here
This option is incorrect because the command `ip nat inside source static` does not block inbound access; instead, it allows inbound traffic to the specified inside host using the mapped public address.
★ When this WOULD be the correct answer
If the question were about a firewall configuration that explicitly denies all inbound traffic to a specific host, then stating that it blocks inbound access would be correct. For example, a question could ask about a firewall rule that drops all packets destined for a specific internal IP.
Why candidates choose this
Candidates might choose this option due to a misunderstanding of NAT concepts, confusing the static mapping with security features that restrict access to internal hosts.
✗It changes the host subnet mask to a public prefixWrong answer — click to see why▾
Why this is wrong here
This option is incorrect because the command does not change the subnet mask of the host; it only creates a static NAT mapping between a private IP and a public IP.
★ When this WOULD be the correct answer
If the question were about a command that explicitly modifies the IP address configuration of a device, such as `ip address 203.0.113.50 255.255.255.0`, then this option would be correct, as it would indicate that the host's subnet mask is being changed to a public prefix.
Why candidates choose this
Candidates might choose this option due to a misunderstanding of NAT concepts, conflating NAT operations with IP address configuration changes, leading them to believe that NAT inherently modifies subnet masks.
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 common exam trap is mistaking static NAT for PAT or dynamic NAT. Candidates may incorrectly assume that the command enables PAT overload, allowing many internal users to share one public IP, but static NAT provides a fixed one-to-one mapping without port translation. Another trap is thinking static NAT blocks inbound traffic; in reality, it enables inbound access to the mapped inside host. Misunderstanding these differences can lead to selecting incorrect answers about NAT behavior and configuration.
Detailed technical explanation
How to think about this question
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 specifically creates a fixed one-to-one mapping between an inside local IP address (private IP) and an inside global IP address (public IP). This mapping remains constant, allowing external hosts to reliably reach the internal device using the public IP.
The command `ip nat inside source static 192.168.1.50 203.0.113.50` configures a static NAT entry on a Cisco router. This means the internal host at 192.168.1.50 will always be translated to 203.0.113.50 when communicating with outside networks. Unlike dynamic NAT or PAT (Port Address Translation), static NAT does not rely on pools or port numbers; it guarantees a permanent address translation, which is essential for hosting services accessible from the internet.
A common exam trap is confusing static NAT with PAT or dynamic NAT. Static NAT does not overload a single public IP with multiple internal hosts, nor does it dynamically assign addresses from a pool. Practically, static NAT is used when an internal server must be reachable externally at a consistent IP address, such as a web or mail server. Understanding this distinction is critical for both exam success and real-world network design.
KKey Concepts to Remember
Static NAT creates a permanent one-to-one mapping between an inside local IP address and an inside global IP address.
The command 'ip nat inside source static' configures a fixed translation that does not change dynamically or use port numbers.
Static NAT allows external hosts to consistently reach an internal device using a predictable public IP address.
PAT overload uses a single public IP with multiple port numbers to translate many internal hosts, unlike static NAT's fixed mapping.
Static NAT does not alter the subnet mask of the inside host; it only translates IP addresses for routing purposes.
Dynamic NAT assigns public IPs from a pool temporarily, whereas static NAT reserves a specific public IP for one internal host.
Static NAT is essential for services that require inbound access from outside networks, such as web servers or VPN endpoints.
Cisco routers use the 'ip nat inside' and 'ip nat outside' interface designations to determine which interfaces participate in NAT translation.
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
Static NAT creates a permanent one-to-one mapping between an inside local IP address and an inside global IP address.
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 200-301 question in full detail.
Review static NAT creates a permanent one-to-one mapping between an inside local IP address and an inside global IP address., 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 — Static NAT creates a permanent one-to-one mapping between an inside local IP address and an inside global IP address..
What is the correct answer to this question?
The correct answer is: It creates a permanent one-to-one translation between the inside host and a public address — This command creates a static NAT mapping between one inside local address and one inside global address. In plain language, the internal device at 192.168.1.50 will always appear as 203.0.113.50 to the outside world. That fixed relationship is useful when a particular internal host or service must be reachable consistently from outside networks.
This is different from PAT, which shares one public address across many sessions using ports. Static NAT is one-to-one and predictable. It does not dynamically pull from a pool in this syntax. The key idea is permanence: the same inside device is always mapped to the same outside address.
What should I do if I get this 200-301 question wrong?
Review static NAT creates a permanent one-to-one mapping between an inside local IP address and an inside global IP address., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Static NAT creates a permanent one-to-one mapping between an inside local IP address and an inside global IP address.
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