TCPIP

1
TCP/IP

• 01/29/2007

2
Historical Perspective

• DOD ARPA project
• ARPANet
• Open
• Common
• Distributed
• Decentralized
• Robust communications network

3
TCP/IP

• Transmission Control Protocol
• Internet Protocol
• Protocol is a standardized way for computers to
  communicate

4
Network Layers

• Network interface
• Facilitating communication with the underlying
  physical network
• Internet layer
• Provides mechanisms for intersystem
  communications

5
Network Layers

• Transport layer
• Provides message transport services between
  applications running on remote systems
• Application layer
• Highest level
• Most of the services we associate the the
  Internet operate here

6
Client/Server Architecture

• Servers(Services)
• Wait for requests from the client programs to
  arrive
• Process these requests
• Division of labor

7
Client/Server Architecture

• Servers
• Web
• Mail
• DB
• Clients
• Browsers
• E-mail

8
Network Topologies

• Star
• Bus
• Ring
• Decentralized

9
Packet Switching

• Information is send in small packets
• 1500 characters
• Envelope (Header)
• To/from, integrity check
• Forward file system
• I/O Buffer

10
TCP/IP Applications

• Telnet
• Ability to use remote computers
• Email
• SMTP Simple Mail Transfer Protocol
• POP Post Office Protocol
• IMAP Internet Message Access Protocol
• Successor to POP
• Nomadic user

11
TCP/IP Applications

• Message forums
• Forerunner to blogs RSS
• Usenet
• Live messaging
• IM
• FTP
• Move files between computers

12
Proto Web

• Gopher
• is a distributed document search and retrieval
  protocol
• Served up menus to user to simplify FTP
• Veronica
• Very Easy Rodent-Oriented Net-wide Index to
  Computer Archives
• Main search engine for Gopher