How does the SYN cookie work?
A)Replaces cookies left by virus\worm programs.
B)Enables encryption of outbound packets.
C)Prevents memory allocation until third part of SYN ACK handshaking.
D)Causes server to send wrong SYNACK to the client.

Question

Quizplus · Accepted Answer

SYN cookies are a technique used to prevent SYN flood attacks, a type of Denial of Service (DoS) attack. Instead of allocating memory resources for a connection upon receiving a SYN request (the first step in the TCP three-way handshake), the server only allocates resources after completing the handshake, thus preventing an attacker from overwhelming the server's memory with incomplete connections.

How Does the SYN Cookie Work