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.
What is the default timeout for NAT translation entries in Cisco IOS?
60 seconds
Why wrong: This is the default for UDP translations, not general NAT.
300 seconds
Why wrong: This is the default for TCP translations after a FIN/RST.
86400 seconds (24 hours)
The default timeout for NAT entries is 24 hours.
Never expires
Why wrong: NAT entries do expire; the default is 24 hours.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
86400 seconds (24 hours)
The default timeout for dynamic NAT translations is 24 hours (86400 seconds). This can be changed with the 'ip nat translation timeout' command.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
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
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
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FAQ
NAT and PAT — This question tests NAT and PAT — Static NAT maps one inside address to one outside address..
The correct answer is: 86400 seconds (24 hours) — The default timeout for dynamic NAT translations is 24 hours (86400 seconds). This can be changed with the 'ip nat translation timeout' command.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 19, 2026
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