Which statement best describes OVPN’s transport layer usage?

• A. 2 or 3
• B. 2
• C. 3
• D. 1

Answer: (A)

The transport layer usage for OVPN is flexible: it can run over either UDP or TCP. This gives you the option to pick UDP for faster performance with lower overhead when the network allows it, or switch to TCP when you need better firewall/NAT traversal and reliability. In practice, you configure OVPN to use the transport that fits the network conditions, so describing it as capable of using both UDP and TCP is the most accurate. The alternatives that imply it’s limited to just one transport don’t fit how OpenVPN is designed to operate across different network environments.