1. RFC 793 State machine study

2. 3-way handshake Page 31, Figure 7

3. 3-way handshake TCP A TCP B SEQ=NA Page:31 Figure. 7 1. CLOSED LISTEN SEQ=NA SEQ=300 Should_ACK=NA

4. 3-way handshake TCP A TCP B SEQ=NA SEQ=300 Page:31 Figure. 7 1. CLOSED LISTEN 2. SYN-SENT --> --> SYN-RECEIVED SEQ=100 SEQ=100 CTL=SYN ACK= DATA= Should_ACK=NA Should_ACK=101

5. 3-way handshake TCP A TCP B SEQ=300 Page:31 Figure. 7 2. SYN-SENT --> --> SYN-RECEIVED 3. ESTABLISHED <-- SYN-RECEIVED SEQ=100 CTL=SYN ACK= DATA= SEQ=300 CTL=SYN ACK=101 DATA= SEQ=100 Should_ACK=NA Should_ACK=101 Should_ACK=301 SEQ=101

6. 3-way handshake TCP A TCP B SEQ=300 Page:31 Figure. 7 3. ESTABLISHED <-- SYN-RECEIVED 4. ESTABLISHED --> --> ESTABLISHED SEQ=300 CTL=SYN ACK=101 DATA= SEQ=101 Should_ACK=101 Should_ACK=301 SEQ=100 CTL= ACK=301 DATA= Should_ACK=101 SEQ=301

7. 3-way handshake TCP A TCP B SEQ=301 Page:31 Figure. 7 4. ESTABLISHED --> --> ESTABLISHED 5. ESTABLISHED --> --> ESTABLISHED SEQ=101 Should_ACK=101 Should_ACK=301 SEQ=100 CTL= ACK=301 DATA= SEQ=100 CTL= ACK=301 DATA=10 Should_ACK=111 SEQ=301