In TLS, which statement about the order of Client Hello and Server Hello is true?

• A. Client Hello occurs after Server Hello
• B. Server Hello occurs before Client Hello
• C. Client Hello occurs before Server Hello
• D. Server Hello never occurs

Answer: (C)

TLS handshakes start with the client sending a ClientHello to propose protocol version, cipher suites, and other options. The server then responds with a ServerHello, selecting the final parameters and continuing the handshake. So the client’s Hello comes before the server’s Hello, making the statement that Client Hello occurs before Server Hello the correct one. The other options imply the server would send data before receiving anything, or that the server would never send a Hello, which doesn’t fit how TLS negotiations are designed.