FORTINET-NSE7-SPECIALTY Nse7 Enterprise Firewall Security And VPN Practice Question
In a complex VPN scenario with NAT-Traversal (NAT-T) enabled, what is the primary purpose of the UDP 4500 port?
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
✓
To encapsulate ESP packets
NAT-T encapsulates ESP packets in UDP 4500 to allow them to pass through NAT devices that would otherwise break ESP integrity.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
To replace the AH protocol
Why it's wrong here
AH is not used for NAT-T.
- ✗
To manage Phase 1 re-keying
Why it's wrong here
Phase 1 re-keying uses standard IKE ports.
- ✓
To encapsulate ESP packets
Why this is correct
UDP 4500 is used to traverse NAT for IPsec.
- ✗
To verify certificate revocation status
Why it's wrong here
This is typically done via OCSP or CRL.
Visual reference
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Fortinet exam blueprint
This FORTINET-NSE7-SPECIALTY practice question is part of Courseiva's free Fortinet 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 FORTINET-NSE7-SPECIALTY exam.