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300-410 Practice Question: In Cisco IOS, what is the default timeout for TCP…
In Cisco IOS, what is the default timeout for TCP NAT translations when the TCP session is idle?
⚠ Common exam trap
Cisco often tests the distinction between the default timeout for idle TCP sessions (86400 seconds) versus the timeout after TCP session teardown (3600 seconds), leading candidates to confuse the two and select 3600 seconds.
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
(86400 seconds) because Cisco IOS defaults TCP NAT translation timeouts for idle sessions to 24 hours (86400 seconds). This long timeout ensures that established TCP sessions are not prematurely dropped by the NAT device, preserving connectivity for long-lived connections such as database replication or SSH sessions. The timeout is configurable via the 'ip nat translation timeout' command, but the default remains 86400 seconds.
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, not TCP.
- ✗
300 seconds
Why it's wrong here
This is not the default TCP timeout in Cisco IOS.
- ✗
3600 seconds
Why it's wrong here
This is the timeout for an established TCP session after the first packet, but the default idle timeout is 86400 seconds.
- ✓
86400 seconds
Why this is correct
Correct. The default TCP NAT translation timeout is 24 hours (86400 seconds) in Cisco IOS.
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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.