hardMultiple ChoiceObjective-mapped
300-410 Practice Question: According to RFC 4787 (NAT Behavioral…
According to RFC 4787 (NAT Behavioral Requirements for UDP), what is the recommended default timeout for UDP NAT mappings?
⚠ Common exam trap
Many candidates confuse the UDP NAT timeout with the TCP NAT timeout (which defaults to 86400 seconds or 24 hours for established TCP sessions) or assume a shorter value like 60 seconds based on common application timeouts, rather than recalling the specific RFC 4787 recommendation.
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
✓
300 seconds
RFC 4787, Section 4.3, specifies that the recommended default timeout for UDP NAT mappings is 300 seconds (5 minutes). This value balances the need to maintain active sessions while promptly releasing stale mappings to conserve NAT table resources. Cisco IOS NAT implementations adhere to this recommendation by default for UDP translations.
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 too short for general UDP traffic; RFC 4787 recommends 5 minutes.
- ✓
300 seconds
Why this is correct
Correct. RFC 4787 recommends and Cisco IOS defaults to 300 seconds for UDP NAT mappings.
- ✗
600 seconds
Why it's wrong here
This is not the recommended default; 300 seconds is the standard.
- ✗
86400 seconds
Why it's wrong here
This is the default for basic NAT, not UDP mappings.
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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.