1. TCP 3 Way Handshake and Half Close

2. TCP Header

3. TCP 3 Way Handshake

4. Example
Host A
Host B 
Send SYN
(seq=100 ctl=SYN)
SYN received

5. Example   Send SYN (seq=100 ctl=SYN) SYN received SYN received
Host A
Host B 
Send SYN
(seq=100 ctl=SYN)
SYN received 
Send SYN, ACK
(seq=300 ack=101 ctl=syn,ack)
SYN received

6. Example    Host A Host B Send SYN (seq=100 ctl=SYN) SYN received
Send SYN, ACK
(seq=300 ack=101 ctl=syn,ack)
SYN received 
Established
(seq=101 ack=301 ctl=ack)

7. TCP Half Close

8. Using Qualnet to Proof Add 2 devices and interconnect them
Add a TELNET
Host1->host2
Session Duration: 10s
Configsetting -> Tracing and Status -> Tracing -> All
RUN
Find the packets

9. Please find out… Use tracer to find out 3 pkts for TCP half close Lab
How many TCP packets
transmitted in 10 sec?
Use tracer to find out 3 pkts for handshake
Are all of them Data packets?
How many Data packets?