Table of Contents
What is a 3-way handshake process?
TCP uses a three-way handshake to establish a reliable connection. The connection is full duplex, and both sides synchronize (SYN) and acknowledge (ACK) each other. The exchange of these four flags is performed in three steps—SYN, SYN-ACK, and ACK—as shown in Figure 3.8.
What is sequence number in 3-way handshake?
As the name implies, the three way handshake process consists of three steps: Host A initiates the connection by sending the TCP SYN packet to the destination host. The packet contains the random sequence number (e.g. 5432) which marks the beginning of the sequence numbers for data that the Host A will transmit.
What is difference between 3-way handshake and 4-way handshake?
TCP Connection establishment is completed in 3 steps and (TCP) graceful termination process occurs in 4 stages that’s the reason connection process is called 3-way and graceful termination process is called 4-way handshake.
Why do we need 3-way handshake in TCP?
Three-Way HandShake or a TCP 3-way handshake is a process which is used in a TCP/IP network to make a connection between the server and client. It is a three-step process that requires both the client and server to exchange synchronization and acknowledgment packets before the real data communication process starts.
Why 3 way handshake is required?
According to RFC 793, Transmission Control Protocol: “The principle reason for the three-way handshake is to prevent old duplicate connection initiations from causing confusion.”
What is flag in TCP?
In TCP connection, flags are used to indicate a particular state of connection or to provide some additional useful information like troubleshooting purposes or to handle a control of a particular connection. Most commonly used flags are “SYN”, “ACK” and “FIN”. Each flag corresponds to 1 bit information.
What happens after TCP 3-way handshake?
This handshaking technique is referred to as TCP Three-way handshake or SYN, SYN-ACK, ACK. After the Three-way handshake, the connection is open and the participant computers start sending data using the agreed sequence and acknowledge numbers.
Why 3-way handshake is required to establish Mcq?
A three-way handshake is required to establish a transport layer connection in a packet switching network because both sides need to know that the packets have been delivered to the other side.
What is urgent pointer in TCP?
Urgent data refers to data that should be processed as soon as possible, even before “normal” data that may be waiting. The presence of urgent data is signified by setting the urgent flag. If the urgent flag is set, it indicates that the urgent pointer is valid and points to that data.
What is 2 way handshake?
The two-way handshake is a simple protocol to create a connection between two parties that want to communicate. In order to do that, this protocol uses synchronization (SYN) and acknowledgment (ACK) messages.
What is SYN and fin?
The SYN flag synchronizes sequence numbers to initiate a TCP connection. The FIN flag indicates the end of data transmission to finish a TCP connection. Their purposes are mutually exclusive.