《计算机导论》课程教学课件（英文讲稿）6-b- The Internet

Portable and Mobile Internet Access WI-FI Hotspots: In an area in which the public can access a Wi-Fi network that offer Inetrnet access.Some Wi-Fi hotspots offer free services the range of Wi-Fi hotspots is cover just samll area. How fast is Hotspots access? The speed relate to the speed of the wired line that connect to server Your distance form the access point Amount of users. Portable Satellite services: 1G (APMS),2G(GSM),2.5G(GPRS),and 3G (EV-DO) Pages:328-329

WI-FI Hotspots: In an area in which the public can access a Wi-Fi network that offer Inetrnet access. Some Wi-Fi hotspots offer free services. the range of Wi-Fi hotspots is cover just samll area. How fast is Hotspots access? - The speed relate to the speed of the wired line that connect to server - Your distance form the access point - Amount of users. Portable Satellite services: 1G (APMS), 2G(GSM), 2.5G(GPRS), and 3G (EV-DO) Pages: 328-329 Portable and Mobile Internet Access

Internet Services Real-time messaging: people allows exchange short message while they are online. e.g.Chat,Skype Yahoo Messenger,Google Talk and VolP. FTP(File Transfer Protocol: provides a way to transfer files from one computer to anotherover any TCP/IP network. FTP make it easy to upload and download file from the computer without deal withwith the OS,File Management System or remote computer. To access FTP server you need FTPclient software. e.g.CuteFTP,WsFTP

Real-time messaging: people allows exchange short message while they are online. e.g. Chat, Skype Yahoo Messenger, Google Talk and VoIP. FTP (File Transfer Protocol: provides a way to transfer files from one computer to anotherover any TCP/IP network. FTP make it easy to upload and download file from the computer without deal with with the OS,File Management System or remote computer. To access FTP server you need FTPclient software. e.g. CuteFTP, WsFTP Internet Services

Internet Security Intrusion: is any access to data or programs by hachers criminals,or other unauthorized persons. as result of an intrusion,data can be stolen or changed,system configuration changed. Securing ports: turn off the computer Screen saver update the computer Security patche Windows update -Windows firewall Sharing printers files (risk) Install Router because the router using NAT(Network address translation)(p.343)

Intrusion: is any access to data or programs by hachers , criminals, or other unauthorized persons. as result of an intrusion, data can be stolen or changed, system configuration changed. Securing ports: - turn off the computer - Screen saver - update the computer - Security patche - Windows update - Windows firewall - Sharing printers & files (risk) - Install Router because the router using NAT(Network address translation)( p.343) Internet Security