- A
PAT allows multiple inside hosts to share a single public IP address by using unique source port numbers.
PAT translates the source port to create a unique session identifier, enabling many hosts to share one global address.
- B
PAT is only supported with a single public IP address configured on the outside interface.
Why wrong: PAT can be used with a pool of public IP addresses as well; it is not limited to a single address.
- C
PAT is also known as NAT overload and is defined in RFC 2663.
PAT is commonly referred to as NAT overload and is documented in RFC 2663 (IP Network Address Translator Terminology).
- D
PAT cannot translate traffic for protocols that use static port numbers, such as DNS or HTTP.
Why wrong: PAT can translate any TCP/UDP traffic, including DNS and HTTP; it only fails for protocols that embed IP addresses in the payload (e.g., FTP, SIP) unless ALG is used.
- E
PAT requires the ip nat inside source list command with the overload keyword.
Why wrong: While the overload keyword is used in dynamic NAT, PAT can also be configured with ip nat inside source list ... interface ... overload; the statement is too narrow because PAT can also be configured with a pool.
300-410 NAT and PAT Practice Question
This 300-410 practice question tests your understanding of nat and pat. 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 TWO statements about NAT overload (PAT) are true? (Choose TWO.)
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
PAT allows multiple inside hosts to share a single public IP address by using unique source port numbers.
A is correct because PAT (Port Address Translation) allows multiple internal hosts to share a single public IP address by assigning unique source port numbers to each session. This multiplexing technique enables many concurrent connections from different inside hosts to appear as if they originate from the same public IP, with the NAT device tracking each session by the combination of source IP and source port.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
PAT allows multiple inside hosts to share a single public IP address by using unique source port numbers.
Why this is correct
PAT translates the source port to create a unique session identifier, enabling many hosts to share one global address.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
PAT is only supported with a single public IP address configured on the outside interface.
Why it's wrong here
PAT can be used with a pool of public IP addresses as well; it is not limited to a single address.
- ✓
PAT is also known as NAT overload and is defined in RFC 2663.
- ✗
PAT cannot translate traffic for protocols that use static port numbers, such as DNS or HTTP.
- ✗
PAT requires the ip nat inside source list command with the overload keyword.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that PAT requires a single public IP address or that it cannot handle protocols with fixed port numbers, when in fact PAT can use a pool of addresses and translates the source port regardless of the destination port.
Trap categories for this question
Keyword trap
While the overload keyword is used in dynamic NAT, PAT can also be configured with ip nat inside source list ... interface ... overload; the statement is too narrow because PAT can also be configured with a pool.
Detailed technical explanation
How to think about this question
Under the hood, PAT maintains a translation table that maps (inside local IP, inside local port) to (outside global IP, outside global port), and for protocols like ICMP it uses the ICMP query ID as a pseudo-port. A subtle behavior is that PAT can exhaust port numbers (65,535 per transport protocol per public IP), leading to connection failures in high-traffic environments, which is why real-world deployments often use multiple public IPs in a PAT pool or combine PAT with static NAT for critical services.
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.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this 300-410 question test?
NAT and PAT — This question tests NAT and PAT — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: PAT allows multiple inside hosts to share a single public IP address by using unique source port numbers. — A is correct because PAT (Port Address Translation) allows multiple internal hosts to share a single public IP address by assigning unique source port numbers to each session. This multiplexing technique enables many concurrent connections from different inside hosts to appear as if they originate from the same public IP, with the NAT device tracking each session by the combination of source IP and source port.
What should I do if I get this 300-410 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: Jul 4, 2026
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