Chapter 22: Network Communication And The Internet

1. Chapter 22: Network Communication And The Internet By: Chasity, Jamon, Clifton

2. The Common Tongue • Computer networks have lots of pathways that send information back and forth. • Networks can even send the information to each other through radio waves. • Transmission Control protocol(TCP)- controls the sending and receiving of information

3. Telephone System • Fax machines- used for sending Images over telephone lines • All of the world’s different telephone systems have been linked together in the Public Switched Telephone Network. • Telephone network provided the first method for computer communication • Local telephone networks have a central connection point for local telephone lines

4. Types Of Telephones • Cell phones can communicate over a wide area because they many “cells” of transmitters that pick up and relay phone signals. • A cellular phone is a radio transmitter and receiver. There are two types of telephone: • Standard phone- Has a physical phone line that leads all the way back to the phone company. • Cellular phone- has no physical wire, but sends it’s messages in radio signals

5. Throwing computers into the mix • Computer’s use digital signals- strings of 1s and 0s; to do all processing. • The world wide telephone network developed into an tool that enables you to send sound, pictures and data anywhere on the planet.

6. The Internet …. • Is a “super network” of smaller networks. • The central heart of the internet is called the backbone. • Routers provided the connection points between the networks and determine the route for the data.

7. The Internet! • routers know the destination of packets of data, they use TCP, which is the common tongue of the internet. • The routers reads the Network ID of each data packet and sends the data packet by the shortest route they know about its destination.

8. Making the Connection: ISP, Dail- up, Dedicated, wireless,Lan • An Internet Service Provider (ISP) leases connections to the internet from on of the backbone networks and in turn, rent a portion of those connections to you. • ISP acts as your gateway to the internet.

9. ISP Roles and Responsibilities • Some offer only dial-up service, where you connect via a modem and then move slowly though the internet. • ISPs provide your on ramp to the internet • All ISP’s enables you to connect to the internet. • Dialup internet service is a service that allows connectivity to the internet through a standard telephone line

10. Dial- Up Connection • The network connection consists of three pieces: a modem, a working telephone line, and an ISP. • The modem enables the computer to communicate to the phone line. • The phone line links between the modem and the computes at the ISP. • The ISP connects to all networks, the internet.

11. Benefits, Reliability, and Disadvantages • Dial-up connections provide the least expensive method of getting your computer onto the internet • Prices in the united states average $9.99-$14.99 per month for dial-up. • It also provides the slowest type of connection to the internet.

12. Data Transmission Rates • Modems send and receive data across the internet in measurements of bits per second (bps). • One Kbps is 1,000 bits per second. • One Mbps is 1,000,000 bits per second • Larger numbers meaning faster data transmission rates.

13. Dial-up Rates • The fastest dial- up download speed you’ll ever get is around 53 Kbps • It would take around 25seconds at the fastest dial-up speed. • People use the internet for complex things like: international phone calls and video conferencing.

14. Dedicated Connections • A dedicated connection gives your computer or network access to the internet through a single high- speed connection. • Two technologies dominate the dedicated connection field : Cable & DSL

15. Cable • Cable connection use regular cable TV cables to serve up fast speed. • Cable blows dial-up out the window, with upload speeds of around 384 Kbps and a 2-5 Mbps download. • Cable connects to a cable modem that then connects to a NIC in your PC via an Ethernet cable.

16. DSL • Digital Subscriber Line (DSL) uses your telephone line as its pipeline. • DSL uses bandwidth capacity to send data over the telephone wires without disturbing their ability to carry voice conversation. • DSL requires very little setup from a users standpoint.

17. Wireless Connection • For your computer to send or receive a wireless signal, it needs a WiFi card, which is a piece of hardware that fits into your computer. • The wireless signal connects to a WiFi router and then goes to an ISP.

18. Benefits And Disadvantage using WiFi • The number one benefit of WiFi technology is its increased mobility. • Interference, updating your older computer and privacy concerns are the disadvantages of WiFi.

19. PDAs and Mobile Phones • Some phone companies offer internet access for an extra fee. • People use cell phones and Wifi –enabled personal digital assistants (PDAs) to access the internet.

20. LAN Connection • Hardware router’s have two sections – a multiple port switch for the LAN and a single Ethernet port for a wide area network (WAN) connection the internet. • A switch, router, and wireless access point are all rolled up into one device.