- A
Inside hosts are translated to addresses in the pool using PAT.
Why wrong: No 'overload' keyword means no port multiplexing; it's one-to-one dynamic NAT.
- B
Inside hosts are dynamically mapped to a pool address; if the pool is exhausted, new translations fail.
Without overload, each translation consumes one pool address; exhaustion blocks new flows.
- C
The router uses the pool address as the source for all outbound traffic, regardless of ACL.
Why wrong: The ACL restricts which inside addresses are eligible for translation.
- D
This configuration requires the 'ip nat outside' interface command to function.
Why wrong: While 'ip nat outside' is needed on the outside interface, the question asks about the effect of the given commands alone; the effect is dynamic NAT without overload.
How to Configure Dynamic NAT (Without PAT) for One-to-One Translation
This 300-410 practice question tests your understanding of nat and pat. 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. 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.
Given this partial configuration:
ip nat pool MYPOOL 203.0.113.10 203.0.113.20 netmask 255.255.255.0 ip nat inside source list 1 pool MYPOOL access-list 1 permit 192.168.1.0 0.0.0.255
What is the effect?
Quick Answer
The answer is that inside hosts are dynamically mapped one-to-one to a pool address, and if the pool is exhausted, new translations fail. This is the effect of dynamic NAT without overload, also known as dynamic one-to-one translation, where the `ip nat inside source list 1 pool MYPOOL` command binds each inside host to a unique public address from the pool without port address translation (PAT). On the Cisco CCNP ENARSI 300-410 exam, this configuration tests your understanding of how dynamic NAT differs from PAT—a common trap is assuming overload is enabled by default, but here the absence of the `overload` keyword means no port multiplexing occurs. When the pool of five addresses (203.0.113.10 through 203.0.113.20) is fully allocated, any additional inside host attempting outbound communication will simply fail to translate. Memory tip: think “no overload, no sharing”—each inside host gets its own public IP, and once the pool is empty, new connections are dropped.
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
Inside hosts are dynamically mapped to a pool address; if the pool is exhausted, new translations fail.
The configuration uses a standard ACL to match inside hosts (192.168.1.0/24) and dynamically assigns them a unique address from the pool 203.0.113.10–203.0.113.20. Because no 'overload' keyword is present, PAT is not enabled; each translation consumes a pool address, and once all 11 addresses are used, new translations fail until an existing translation times out or is cleared.
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.
- ✗
Inside hosts are translated to addresses in the pool using PAT.
Why it's wrong here
No 'overload' keyword means no port multiplexing; it's one-to-one dynamic NAT.
- ✓
Inside hosts are dynamically mapped to a pool address; if the pool is exhausted, new translations fail.
Why this is correct
Without overload, each translation consumes one pool address; exhaustion blocks new flows.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The router uses the pool address as the source for all outbound traffic, regardless of ACL.
Why it's wrong here
The ACL restricts which inside addresses are eligible for translation.
- ✗
This configuration requires the 'ip nat outside' interface command to function.
Why it's wrong here
While 'ip nat outside' is needed on the outside interface, the question asks about the effect of the given commands alone; the effect is dynamic NAT without overload.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between dynamic NAT and PAT by omitting the 'overload' keyword, leading candidates to assume PAT is always used with a pool when in fact it must be explicitly configured.
Trap categories for this question
Keyword trap
No 'overload' keyword means no port multiplexing; it's one-to-one dynamic NAT.
Command / output trap
While 'ip nat outside' is needed on the outside interface, the question asks about the effect of the given commands alone; the effect is dynamic NAT without overload.
Detailed technical explanation
How to think about this question
Dynamic NAT without overload uses a one-to-one mapping between inside local and inside global addresses; the router creates a translation entry when the first packet from an inside host traverses the NAT router, and the pool address is released only after the translation idle timeout (default 24 hours for TCP/UDP, or configurable via 'ip nat translation timeout'). In a real-world scenario, if 12 hosts attempt outbound connections simultaneously, the 12th will fail with 'NAT: translation failed (pool exhausted)' until a previous translation expires or is cleared manually.
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
Got this wrong? Here's your next step.
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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: Inside hosts are dynamically mapped to a pool address; if the pool is exhausted, new translations fail. — The configuration uses a standard ACL to match inside hosts (192.168.1.0/24) and dynamically assigns them a unique address from the pool 203.0.113.10–203.0.113.20. Because no 'overload' keyword is present, PAT is not enabled; each translation consumes a pool address, and once all 11 addresses are used, new translations fail until an existing translation times out or is cleared.
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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