Computer Network ( 電腦網絡 ) n A computer network is set of two or more computers connected together. n Advantages: –communicating with other users –sharing.

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Presentation transcript:

Computer Network ( 電腦網絡 ) n A computer network is set of two or more computers connected together. n Advantages: –communicating with other users –sharing resources (e.g., files, printer)

Local Area Networks (LAN)

Wide Area Network (WAN) High Speed Link as a Backbone LAN

Internet ( 國際互聯網 ) n A global interconnection of networks n connection via: –telephone lines –optical fibers –radio links

Internet Terms n Modem (Modulator/demodulator) –an electronic device for converting between serial data from a computer and audio signal suitable for transmission over telephone lines

Internet Terms n Modem (Modulator/demodulator) Types: –external modem –internal modem –wireless modem

Internet Terms n TCP/IP TCP/IP –data are broken down into packets and sent across the Internet, it is then recombined and checked the correctness of data. n UNIX –a multi-user, multitasking operating system developed in AT&T Bell Lab. –a system software used by most server.

Internet Terms n ISP ( 網絡供應商 ) –a business that supplies Internet connectivity services to individuals and other organisations Example –IMS –CTI –iCable

Internet Terms n DNS ( 網域名稱系統 ) Domain name address –used by human users –e.g., “ IP address –used by packet routing software –e.g., “ ”

Internet Terms n URL ( 劃一資源定位器 ) –address for a document or site on the Internet e.g., n HTTP ( 超文本傳送協定 ) HTTP –the client/server protocol used to access information on the WWW.

Internet Terms n POP ( 郵局規約 ) –Post Office Protocol –a standard used in receiving n SMTP ( 簡單郵遞傳送規約 ) –Simple Mail Transfer Protocol –a standard used in sending

Internet Terms n HTML ( 超文本標記語言 ) –a language used for documents on the WWW. Example …

Internet Resources n ( 電子郵遞 ) –message sent and received electronically via telecommunication links between computers. n World Wide Web ( 全球資訊網 ) –uses a multimedia interface to link to resources located worldwide

Internet Resources n Newsgroup ( 新聞組 ) –a topic-specific forum where people can post questions, news, and comments, or read and respond to such postings n IRC ( 互聯網傳達對話 ) –a service that enables an Internet user to participate in a conversation online with other users.

Internet Resources n BBS ( 電子公告欄 ) –a system equipped with one or more modems or other means of network access that serves as an information and message-passing centre for remote users.

Internet Services n Telnet –runs programs on remote computers n FTP (File Transfer Protocol) –transfers files between local and remote computers

file TCP/IP ClientServer

HTTP Server Client WWW modem broadband adaptor

Free n Web Space – n Web Counter – n Guest Book – n Graphic Files (gif, applet, …) –