Date: Sat, 03 Feb 2007 18:52:43 -0600 (CST)
   From: Mark Jacobson <jacobson@math-cs.cns.uni.edu>
     To: 810-023-01-spring@uni.edu
Subject: [810-023-01-SPRING] Please Do Not Throw

January 31st, 2007 Wednesday class review...

Protocol Stack               Protocol Stack
   of client                    of server
---------------             ----------------
    3905                            23             Port numbers
   Transport                     Transport

  192.168.0.100                 128.153.4.131      IP numbers
    Network                       Network

  00:07:E9:53:87:D9           ??:??:??:??:??:??    NIC or MAC address
     Data Link                    Data Link

This is a review of Wednesday, 01/31 class and if you look at the
     Ethernet II,
the Internet Protocol and
the Transmission Control Protocol

     for packet number one in the telnet.cap file, you
     will see all of the above numbers.

    TCP and UDP level protocols are at the Transport level of the
    7 layer OSI model stack.

    The first three packets of telnet.cap are the

           THREE WAY HANDSHAKE that initiates a TCP connection
           oriented network communication.

           TCP is like a phone call.

           1. SYN
           2. SYN, ACK
           3. ACK                  is the 3 way handshake...

           UDP is a form of communication that involves less
           overhead and is also much less reliable.

           TCP is more costly, but more reliable.

     Mark