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Wednesday, September 19, 2012

PowerPoint Presentation On The Internet, Intranets, and Extranets

Presentation On The Internet, Intranets, and Extranets

The Internet, Intranets, and Extranets   Presentation Transcript:
1. An Overview of Telecommunications and Networks
Telecommunications: the electronic transmission of signals for communications
Telecommunications medium: anything that carries an electronic signal and interfaces between a sending device and a receiving device

2. Networks
Computer network: the communications media, devices, and software needed to connect two or more computer systems or devices
Network nodes: the computers and devices on the networks

3. Basic Processing Strategies
Centralized processing: all processing occurs in a single location or facility
Decentralized processing: processing devices are placed at various remote locations
Distributed processing: computers are placed at remote locations but connected to each other via a network

4. Terminal-to-Host, File Server, and Client/Server Systems
Connecting computers in distributed information processing:
Terminal-to-host: the application and database reside on one host computer, and the user interacts with the application and data using a “dumb” terminal
File server: the application and database reside on the one host computer, called the file server
Client/server: multiple computer platforms are dedicated to special functions, such as database management, printing, communications, and program execution

5. Network Types
Personal area network (PAN)
Local area network (LAN)
Metropolitan area network (MAN)
Wide area network (WAN)
International network

6. Communications Software and Protocols
Communications software: software that provides a number of important functions in a network, such as error checking and data security
Network operating system (NOS)
Network management software
Communications protocol: a standard set of rules that controls a telecommunications connection

 7. Use and Functioning of the Internet
Internet: a collection of interconnected networks, all freely exchanging information
The ancestor of the Internet
A project started by the U.S. Department of Defense (DoD) in 1969
Internet Protocol (IP): communication standard that enables traffic to be routed from one network to another as needed

8. How the Internet Works
The Internet transmits data from one computer (called a host) to another
If the receiving computer is on a network to which the first computer is directly connected, it can send the message directly
If the receiving computer is not on a network to which the sending computer is connected, the sending computer relays the message to another computer that can forward it

9. The Internet
The internet A network of networks
The internet transmits data from one computer (called a host) to another
Internet networks Linked networks that work much the same way -- they pass data around in packets, each of which carries the addresses of its sender and receiver

10. Internet
Unlike online services, which are centrally controlled, the Internet is decentralized by design. Each Internet computer, called a host, is independent. Its operators can choose which Internet services to use and which local services to make available to the global Internet community. Remarkably, this anarchy by design works exceedingly There are a variety of ways to access the Internet. It is also possible to gain access through a commercial Internet Service Provider (ISP).

11. How the Internet Works
Transport control protocol (TCP)
A protocol that operates at the transport layer and is used in combination with IP by most Internet applications
An Internet high-speed, long distance communications links (like a bus; wire that connects nodes)
Uniform resource locator (URL)
An assigned address on the Internet for each computer E.g.,

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