Which source port does IKE use when NAT has been detected between two VPN gateways?
A.
TCP 4500
B.
TCP 500
C.
UDP 4500
D.
UDP 500
Explanation:
BD
The IKE protocol uses UDP packets, usually on port 500
NAT traversal: The encapsulation of IKE and ESP in UDP port 4500 enables these protocols to pass through a
device or firewall performing NAT
Source: https://en.wikipedia.org/wiki/Internet_Key_Exchange