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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. 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 three of the following statements about Network Address Translation (NAT) are correct? (Choose three.)
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
✓
Static NAT provides a one-to-one mapping between a private IP and a public IP.
Static NAT provides a one-to-one mapping between a private IP and a public IP, ensuring that a specific internal host always uses the same public address. Dynamic NAT uses a pool of public IP addresses assigned on a first-come, first-served basis, so internal hosts compete for available addresses. PAT (Port Address Translation) allows multiple internal hosts to share a single public IP by differentiating sessions via unique port numbers, which is the most common form of NAT used in home and small office routers.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that dynamic NAT provides a fixed mapping like static NAT, or that PAT requires multiple public IPs, when in fact PAT is designed to share a single public IP among many hosts.
Detailed technical explanation
How to think about this question
Under the hood, PAT (also known as NAT overload) tracks each session using a translation table that maps the internal private IP:port to the public IP:port. When the internal host initiates a connection, the router assigns a unique source port (often from a range like 1024–65535) to differentiate sessions. This is defined in RFC 2663 and is critical for conserving public IPv4 addresses, as a single public IP can support up to ~65,000 simultaneous connections per transport protocol (TCP/UDP).
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.
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FAQ
Questions learners often ask
What does this 200-301 question test?
Network Services and Security — This question tests Network Services and Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Static NAT provides a one-to-one mapping between a private IP and a public IP. — Static NAT provides a one-to-one mapping between a private IP and a public IP, ensuring that a specific internal host always uses the same public address. Dynamic NAT uses a pool of public IP addresses assigned on a first-come, first-served basis, so internal hosts compete for available addresses. PAT (Port Address Translation) allows multiple internal hosts to share a single public IP by differentiating sessions via unique port numbers, which is the most common form of NAT used in home and small office routers.
What should I do if I get this 200-301 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: Jun 11, 2026
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