tailieunhanh - Lecture Introduction to Computers: Chapter 10A - Peter Norton's

Chapter 10A - Connecting to the Internet. This lesson provides an overview of the options for connecting a computer to the Internet. It also shows how the wireless Internet works, and discusses the need for wireless security. | McGraw-Hill Technology Education Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved. Chapter 10A Connecting to the Internet Wired Internet Connections Dial-up connections Standard phone lines and a modem Computer dials a number for your ISP All Internet programs use the connection Applications might need configured 10A- Wired Internet Connections High-speed broadband connections Any connection faster than dialup Networks share the broadband connection All users access the same connection T or DSL lines common Home use increasing due to Lower cost Increased availability 10A- Wired Internet Connections ISDN Offers speeds up to Mbps Uses standard phone lines Requires special equipment Simultaneous use of phone and data 10A- Teaching tip More information on ISDN can be found on . Wired Internet Connections DSL Offers speeds up to 30 Mbps Uses modified phone lines Needs special DSL modem Simultaneous use of phone and data Asynchronous DSL Different up and download speeds Synchronous DSL Variable DSL Speed changes based on traffic 10A- Teaching tip For more information on dsl see . DSL Connections 10A- Wired Internet Connections Cable modems Speeds up to 3 Mbps Uses cable TV wires Requires a cable modem Simultaneous use of TV and data 10A- Software Accessing The Internet Application programming interface (API) Simplifies connection to network devices Allows any application to access Internet UNIX API uses sockets Windows API uses winsock 10A- Insider information A socket (UNIX or Windows) is a combination of an IP address and a port. For example, connecting to the HTTPS port on machine . The socket is . Software Accessing The Internet Network drivers Control access to the hardware Ethernet and dial-up require a driver API connects to the driver 10A- Teaching tip Figure on page 387 describes this interaction very well. API and . | McGraw-Hill Technology Education Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved. Chapter 10A Connecting to the Internet Wired Internet Connections Dial-up connections Standard phone lines and a modem Computer dials a number for your ISP All Internet programs use the connection Applications might need configured 10A- Wired Internet Connections High-speed broadband connections Any connection faster than dialup Networks share the broadband connection All users access the same connection T or DSL lines common Home use increasing due to Lower cost Increased availability 10A- Wired Internet Connections ISDN Offers speeds up to Mbps Uses standard phone lines Requires special equipment Simultaneous use of phone and data 10A- Teaching tip More information on ISDN can be found on . Wired Internet Connections DSL Offers speeds up to 30 Mbps Uses modified phone lines Needs special DSL modem Simultaneous use of phone and data .