Cisco
210-260 · Question #38
Which source port does IKE use when NAT has been detected between two VPN gateways?
The correct answer is C. UDP 4500. Take the common case of the initiator behind the NAT. The initiator must quickly change to port 4500 once the NAT has been detected to minimize the window of IPsec-aware NAT problems.
VPN
Question
Which source port does IKE use when NAT has been detected between two VPN gateways?
Options
- ATCP 4500
- BTCP 500
- CUDP 4500
- DUDP 500
How the community answered
(28 responses)- A7% (2)
- B4% (1)
- C86% (24)
- D4% (1)
Explanation
Take the common case of the initiator behind the NAT. The initiator must quickly change to port 4500 once the NAT has been detected to minimize the window of IPsec-aware NAT problems.
Topics
#IKE#NAT-T#NAT traversal#UDP 4500
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