1. Chapter 7 Networks and the Internet Networks Sharing resources among multiple computers (workstations) Local Area Networks Wide Area Networks

2. Servers run the network and share resources Workstations are computers connected to the network Hubs are connection points between workstations and servers

3. Network Connectivity, Communications and Security Protocols Workstations on network must all speak same language Bandwidth Capacity of transmission media Passwords Assign access rights for each user to increase security Firewalls Prevent unauthorized access

4. Sharing and Communicating via the Network Resource Sharing Programs installed on server, shared by workstations Site licenses Economical and efficient for upgrades Backup Strategies Redundant systems, backup disks, local copies

5. Shared Resources Data Access files from anywhere Administrative Tools (Groupware) Calendars, address books, reservations lists Academic Tools Monitor student activity Hardware Share printers on network

6. Communication via Email Key communication tool in networked environment Teachers can communicate with colleagues, students, and parents Students can become “e- buddies” and “e-mentors” Scheduling not an issue

7. Expand Connectivity through Telecommunication Telephone Lines DSL Cable Modems Satellite

8. Modems “Translating devices” MOdulate and DEModulate digital signals across analog phone lines Expand network beyond LAN Allow users to access network remotely

9. Digital Subscriber Lines (DSL) High-speed digital phone line Up to 30x faster than analog Voice and Data transmissions Eliminates need for 2 phone lines

10. Cable Modems Use existing cable TV lines Generally faster than DSL Not available everywhere

11. Satellite Connections Connect using TV satellites High-speed connection Require subscription to service Greater availability for remote locations

12. The Internet Connects millions of networks across the globe Diverse computers access data similarly using TCP/IP Internet Service Providers (ISP’s) provide access

13. Internet Communications Synchronous Communication Internet Relay Chat, Video Conferencing Asynchronous Communication Email, bulletin boards, forums, newsgroups, web pages, mailing lists File Transfer Protocol