Networking

1
Networking

• HSPM J713

2
Why networks?

• Communications
• Distributing work
• Connecting functions
• Local area network
• Wide area network

3
Mainframe

• Wiring resembles this, except that each terminal
  connects by wire to the network controller, like
  spokes of a wheel.
• Host computer typically also connects to printer

4
Mainframe

• Dumb terminals connect to big computer
• PCs today emulate terminals using software
• Big computer does the computing, has the storage
• Suitable for billing, payroll, accounting
• Live database
• All functions on mainframe
• Functions communicate through saved files

5
Client-server

• Schematic actual connection method shown later
• Front-end functions on client
• Interface, computing
• Back-end functions on server
• Database and software to access it

6
File and print server

• Also schematic of connection
• Computing done on workstations
• Server stores files and manages printer

7
Hub or switch connects computers

• Typical of networks today
• Ethernet
• In client-server, one of the Computers is the
  server
• In File and print, one of the computers is the
  file server

8
Internet and intranet

• Internet
• Uses internet protocols
• World wide standards
• Every computer gets an address
• 129.252.74.85 for example
• Names, like hspm.sph.sc.edu get matched to
  numbers with DNS

• Intranet
• Internal internet
• Uses internet standards for internal communication