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300-410 Practice Question: The default timeout for NAT translation entries…
What is the default timeout for NAT translation entries in Cisco IOS?
⚠ Common exam trap
Cisco often tests the distinction between general NAT translation timeout and protocol-specific timeouts (like DNS timeout of 300 seconds), leading candidates to mistakenly choose 300 seconds as the default for all NAT entries.
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 (24 hours)
C is correct because the default timeout for NAT translation entries in Cisco IOS is 86400 seconds (24 hours). This default applies to dynamic NAT translations that are not protocol-specific, such as those for TCP or UDP, and ensures that translations remain active for a full day before being aged out, balancing resource usage with session persistence.
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 for UDP translations, not general NAT.
- ✗
300 seconds
Why it's wrong here
This is the default for TCP translations after a FIN/RST.
- ✓
86400 seconds (24 hours)
Why this is correct
The default timeout for NAT entries is 24 hours.
- ✗
Never expires
Why it's wrong here
NAT entries do expire; the default is 24 hours.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.