Note: See the picture's two diagram and answer according to this.

Question: Briefly Explain the Timing Diagrams of two different connection establishment mechanisms of TCP.

TCP Connection Establishment Host 1 Host 2 Host 1 Host 2 SYN (SEQ = x) SYN (SEQ = x) SYN (SEQ = y) Time SYN (SEQ = y, ACK = x + 1) SYN (SEQ = y, ACK = x + 1) SYN (SEQ = X, ACK = y + 1) (SEQ = x + 1, ACK = y + 1) (a) (b) (a) TCP connection establishment in the normal case. (b) Call collision. TCP Connection Establishment Connections are established in TCP by means of the three-way handshake For connection establishment one side executes a CONNECT primitives specifying the IP address and port to which it wants to connect, the maximum TCP segment size and optionally some user data The CONNECT primitives sends a TCP segment with SYN bit on and ACK bit off and wait for response TCP Connection Establishment When this segment arrives at the destination, the TCP entity there checks to see if there is a process that has done a LISTEN on the port gives in the destination port field If not, it sends a reply with RST bit on to reject the connection If some process is listening to the port, that process is given the incoming TCP segment If it accepts, an acknowledgement segment is sent back