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300-410 Practice Question: The default timeout value for a NAT translation…
What is the default timeout value for a NAT translation entry that is not using Port Address Translation (PAT) in Cisco IOS?
⚠ Common exam trap
Cisco often tests the distinction between PAT and non-PAT timeout defaults, trapping candidates who confuse the 86400-second timeout for TCP PAT entries with the non-PAT timeout, or who mistakenly recall the 60-second UDP PAT timeout as the default for all translations.
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
✓
86400 seconds
The default timeout for a NAT translation entry without Port Address Translation (PAT) in Cisco IOS is 86400 seconds (24 hours). This is because a one-to-one NAT mapping is expected to remain stable for extended periods, unlike PAT entries which time out quickly (e.g., 60 seconds for UDP, 86400 seconds for TCP) due to port reuse. The 86400-second value ensures that the translation persists for long-lived sessions without unnecessary churn.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
60 seconds
Why it's wrong here
This is the default timeout for UDP NAT translations, not basic NAT.
- ✗
300 seconds
Why it's wrong here
This is the default timeout for TCP NAT translations without data transfer.
- ✓
86400 seconds
Why this is correct
Correct. Basic NAT translations default to 24 hours (86400 seconds) in Cisco IOS.
- ✗
3600 seconds
Why it's wrong here
This is not a default NAT timeout value in Cisco IOS.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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