1. Presentation Slides (.ps)
2. Random pictures
   • internetworks
   • OSI model with routers
   • OSI model with headers
3. Tool Examples
   • netstat
   • tcpdump of downloading Yahoo home page (HTML, 3 GIF files)
   • ping of www.yahoo.com
   • traceroute to www.yahoo.com
   • nslookup for www.yahoo.com
4. Application Protocol Examples
   • HTTP (.ps)
   • SMTP (.ps)
   • NNTP (.ps)

All figures are from Computer Networks, by Tanenbaum. He has a web page with all his diagrams.