Which is the attack type where multiple SYN requests flood a web server, denying TCP sessions to valid users?

• A. Syn Flood
• B. SYN Request
• C. Tailgating
• D. Tarpit

Answer: (A)

A denial-of-service technique that targets the TCP handshake by flooding the server with SYN packets, leaving half-open connections and exhausting the backlog, causing legitimate users to be unable to establish TCP sessions. In a SYN flood, the attacker initiates many connection attempts but doesn’t complete them, so the server keeps resources allocated while waiting for the final handshake. This is the standard name for that exact attack, making it the best choice. The other terms don’t describe this behavior: Tailgating is a physical-security breach; Tarpit is a defensive technique that slows or delays connections rather than simply flooding them; SYN Request isn’t a recognized term for this attack.