What is one purpose of the TCP three-way handshake?

Answer 1

The three-way handshake in Transmission Control Protocol (also called the three message handshake) is the method used to establish and tear down network connections. This handshaking technique is referred to as the 3-way handshake or as "SYN-SYN-ACK" (or more accurately SYN, SYN-ACK, ACK). The TCP handshaking mechanism is designed so that two computers attempting to communicate can negotiate the parameters of the network connection before beginning communication. This process is also designed so that both ends can initiate and negotiate separate connections at the same time.

Answer 2

Host A sends a TCP SYNchronize packet to Host B

Host B receives A's SYN

Host B sends a SYNchronize-ACKnowledgement

Host A receives B's SYN-ACK

Host A sends ACKnowledge

Host B receives ACK.

TCP socket connection is ESTABLISHED

Answer 3

To understand the TCP split-handshake attack you need to understand how network devices build TCP connections. I'm going to assume you are familiar with the TCP three-way handshake. If not,this guide will walk you through it. Most network administrator understand this three-way handshake technique quite well, and many gateway security devices (like stateful firewalls) are designed to enforce it. However, less people know about another legitimate way to build TCP connections, called the simultaneous-open handshake. With a simultaneous open connection, both a client and server send a SYN packet to each other at about the same time. Then both sides also send ACK packets to each other in response. This slightly different variant of the TCP handshake doesn't happen much in the real world, however, it's a perfectly legitimate way to start a TCP connection (according to RFC 793).

Answer 4

The TCP three way handshake describes how two systems using the TCP protocol "talk to each other" to begin communication. The correct sequence is SYN, SYN-ACK, ACK

Joey Hernandez CISM CISSP

Answer 5

It synchronizes both ends of a connection by allowing both sides to agree upon initial sequence numbers.