Chapter 3 - Part 3

Timeline of The Internet and The Web

• 1970's: Connections established, ARPANET expands

• 1971 Arpanet increases to 15 nodes.
  

• 1972 Ray Tomlinson creates an email program for ARPANET.  He picks the "@" symbol to spearate the username and address as it was easily available on teletype machines.
  

• 1972-1972  Telnet and FTP protocols were established. Telnet allows remote login across a network and ftp allows file transfers between sites.
  

• 1974 Vinton Cerf and Bob Kahn develop TCP/IP network communication protocols.
  
• IP - Controls how computers identify each other and how packets are labelled.  (IP address - Number ID for a computer, like 138.236.64.67)
  
• TCP - Controls how messages are boken down into packets and then re-assembled at destination.  (packet size <= 1500 bytes)  (Overhead)
  
• Example configuration - run "/sbin/ifconfig" on classroom machine
  
• Domain Name System: User-friendly names are given as substitutes for IP address.  Example -- pokey.mcs.gac.edu is domain name for 138.236.64.67
<>Top-Level Domains:  edu, com, org, mil, gov, net, ca, uk
Domain Name Servers (Overhead)