3.1 Define the Internet, describe how it works and explain how it provides business value. The Internet is a vast network of computers that connects millions of people all over the world. The Internet uses the client/server model of computing and the TCP/IP network reference model. Every computer on the Internet is assigned a unique numeric IP address. No one owns the Internet, and it has no formal management organization. However, worldwide Internet policies are established by organizations and government bodies, such as the Internet Architecture Board and the World Wide Web Consortium. The Internet must also conform to the laws of the sovereign nation-states in which it operates, as well as the technical infrastructure that exist within the nation-state. The Internet enables employees to gain remote access to the company’s internal systems through its Web site. They are able to better service customers and suppliers, improve operational efficiency, increase productivity, lower operational costs, have a broader market base, and reach more individual customers on a global scale by establishing a Web presence. The cost of e-mail and other Internet services tend to be far lower than equivalent voice, postal, or over night delivery costs, making the Internet a very inexpensive communication medium. It is also a very fast method of communication, with messages arriving anywhere in the world in a matter of seconds or minutes. 3.2 Explain how the Domain Name System (DNS) and IP addressing system work. The Internet is based on the TCP/IP networking protocol suite. Every computer on the Internet is assigned a unique Internet Protocol (IP) address, which currently is a 32-bit number represented by four strings of numbers ranging from 0 to 255 separated by periods. A domain name is the English-like name that corresponds to the unique 32-bit numeric IP address for each computer connected to the Internet. The Domain Name System (DNS) converts IP addresses to domain names so that users only need to specify a domain name to access a computer on the Internet instead of typing the numeric IP address. DNS servers maintain a database containing IP addresses mapped to their corresponding domain names. 3.2 List and describe the principal Internet services. E-mail person-to-person messaging; document sharing. Newsgroups discussion groups on electronic bulletin boards. Chatting and instant messaging interactive conversations. Telnet logging on to one computer system and doing work on another. File Transfer Protocol (FTP) transferring files from computer to computer. World Wide Web retrieving, formatting, and displaying information (including text, audio, graphics, and video) using hypertext links.
3.3 Define and describe VoIP and virtual private networks and explain how they provide value to businesses.
- Winter '14
- Computer network, World Wide Web, Wireless Sensor Networks