【正文】 2022 by Prentice Hall Reader Tag 169。 2022 by Prentice Hall ? Wireless puter works and Inter access – WiFi () ? Set of standard: , , , ? Used for wireless LAN and wireless Inter access ? Use access points: Device with radio receiver/transmitter for connecting wireless devices to a wired LAN ? Hotspots: One or more access points in public place to provide maximum wireless coverage for a specific area ? Weak security features 169。 2022 by Prentice Hall 黑莓手機(jī) (Blackberry)，是指由加拿大 Reserach In Motion Ltd，簡稱 RIM公司推出的一種無線手持郵件解決終端設(shè)備。 2022 by Prentice Hall Major Web Search Engines Essentials of Business Information Systems Chapter 6 Telemunications, the Inter, and Wireless Technology Figure 614 Google is the most popular search engine on the Web, handling 56 percent of all Web searches. The Global Inter 169。 2022 by Prentice Hall ftp:文件傳輸協(xié)議 向遠(yuǎn)程主機(jī)傳輸 \下載文件 client/server model ? client: side that initiates transfer (either to/from remote) ? server: remote host file transfer FTP server FTP user interface FTP client local file system remote file system user at host 169。 2022 by Prentice Hall HTTP/ 200 OK Date: Mon 03 Aug 1998 17:35:46 GMT Server: NCSA/ Location: ~adennis/ Contenttype: text/html html head titleBusiness Data Communications and Networking Web Resources /title /head body H2Resources on the Web /H2 PThis section contains links to other resources on the WEB that pertain to the field of data munications and working /P /body /html Response Header ] Type of file ] Date ] Web server ] URL HTTP version Status code Reason phrase HTTP： web server response Response Body 169。 2022 by Prentice Hall HTML ? HTML—hyperText Markup Language ? html ? body ? hello, world. ? /body ? /html 169。 2022 by Prentice Hall A Virtual Private Network Using the Inter Essentials of Business Information Systems Chapter 6 Telemunications, the Inter, and Wireless Technology Figure 612 This VPN is a private work of puters linked using a secure “tunnel” connection over the Inter. It protects data transmitted over the public Inter by encoding the data and “wrapping” them within the Inter Protocol (IP). By adding a wrapper around a work message to hide its content, anizations can create a private connection that travels through the public Inter. The Global Inter 169。 2022 by Prentice Hall Broadband Network Services and Technologies ? Frame relay ? Asynchronous Transfer Mode (ATM) ? Integrated Services Digital Network (ISDN) ? Digital subscriber line (DSL) ? Cable Inter connections ? T lines Communications Networks Essentials of Business Information Systems Chapter 6 Telemunications, the Inter, and Wireless Technology 169。 World Wide Web Consortium (W3C): set HTML and programming standards for the Web. 中國互聯(lián)網(wǎng)絡(luò)信息中心（ CNNIC） 169。 2022 by Prentice Hall 169。 2022 by Prentice Hall Networks in Large Companies Telemunications and Networking in Today’s Business World Essentials of Business Information Systems Chapter 6 Telemunications, the Inter, and Wireless Technology ? Components can include: ? Hundreds of local area works (LANs) linked to firmwide corporate work ? Various powerful servers ? Web site ? Corporate intra, extra ? Backend systems ? Mobile wireless LANs (WiFi works) ? Videoconferencing system ? Telephone work ? Wireless cell phones 169。 2022 by Prentice Hall 6 Chapter Telemunications, the Inter, and Wireless Technology 169。 2022 by Prentice Hall What Is a Computer Network? Telemunications and Networking in Today’s Business World Essentials of Business Information Systems Chapter 6 Telemunications, the Inter, and Wireless Technology ? Two or more connected puters ? Major ponents in simple work ? Client puter ? Server puter ? Network interfaces (NICs) ? Connection medium ? Network operating system ? Hub or switch ? Routers ? Device used to route packets of data through different works, ensuring that data sent gets to the correct address 169。 2022 by Prentice Hall Key Digital Networking Technologies Telemunications and Networking in Today’s Business World Essentials of Business Information Systems Chapter 6 Telemunications, the Inter, and Wireless Technology ? TCP/IP and connectivity ? Connectivity between puters enabled by protocols ? Protocols: Rules that govern transmission of information between two points ? Transmission Control Protocol/Inter Protocol (TCP/IP) ? Common worldwide standard that is basis for Inter ? Department of Defense reference model for TCP/IP ? Four layers ? Application layer ? Transport layer ? Inter layer ? Network interface layer 169。 2022 by Prentice Hall ? What is the Inter? ? Inter Addressing and Architecture ? The Domain Name System（域名） ? Hierarchical structure ? Toplevel domains Essentials of Business Information Systems Chapter 6 Telemunications, the Inter, and Wireless Technology The Global Inter 169。 2022 by Prentice Hall ? 表示機(jī)構(gòu)類別 的二級(jí)域名 域名 類別 域名 類別 . 工、商、金融等企業(yè) .biz 工商企業(yè) .edu 教育機(jī)構(gòu) .int 國際組織 .gov 政府組織 . 非盈利性的組織 .mil 軍事部門 .info 信息相關(guān)機(jī)構(gòu) . 網(wǎng)絡(luò)相關(guān)機(jī)構(gòu) .name 個(gè)人網(wǎng)站 169。 2022 by Prentice Hall VoIP(Voice over Inter Protocol)是指將模擬的聲音訊號(hào)經(jīng)過壓縮與封包之后，以數(shù)據(jù)封包的形式在IP 網(wǎng)絡(luò)的環(huán)境進(jìn)行語音訊號(hào)的傳輸，通俗來說也就是互聯(lián)網(wǎng)電話、網(wǎng)絡(luò)電話或者簡稱 IP電話的意思。 2022 by Prentice Hall ? Read the Interactive Session and then discuss the following questions: ? Should managers monitor employee and Inter usage? Why or why not? ? Describe an effective and Web use policy for a pany. Interactive Session: People Monitoring Employees on Networks: Uhical or Good Business? Essentials of Business Information Systems Chap