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Read the full NAT/PAT explanation →Question 35 of 1,819
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 are functions of Network Address Translation (NAT) overload (PAT)? (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
✓
It translates multiple private IP addresses to a single public IP address.
PAT (Port Address Translation), also known as NAT overload, allows multiple internal hosts to share a single public IP address by translating each session's source port to a unique port number. This enables the router to differentiate between concurrent sessions from different internal hosts, even though they all appear to originate from the same public IP. The correct options highlight the core functions: translating many private IPs to one public IP and using unique source port numbers for session differentiation.
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 PAT requires a pool of public IPs equal to the number of internal hosts, when in fact PAT's defining feature is the ability to map many internal hosts to a single public IP using port multiplexing.
Detailed technical explanation
How to think about this question
PAT modifies the Layer 4 source port in the TCP/UDP header to a unique value, maintaining a translation table that maps (private IP, original port) to (public IP, assigned port). This allows up to 65,536 sessions per public IP (theoretical limit, minus reserved ports), making it essential for conserving public IPv4 addresses in enterprise and home networks. Cisco IOS uses the 'ip nat inside source list ACL interface interface overload' command to enable PAT.
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.
What to study next
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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: It translates multiple private IP addresses to a single public IP address. — PAT (Port Address Translation), also known as NAT overload, allows multiple internal hosts to share a single public IP address by translating each session's source port to a unique port number. This enables the router to differentiate between concurrent sessions from different internal hosts, even though they all appear to originate from the same public IP. The correct options highlight the core functions: translating many private IPs to one public IP and using unique source port numbers for session differentiation.
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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