A computer network is a system that connects, computers via communications media so that data and information can be transmitted among them. The two major types of networks are local area networks (LANs) and wide area networks (WANs). LANs encompass a limited geographic area and usually are composed of one communications medium. In contrast, WANs encompass a broad geographical area and usually are composed of multiple communications media.
Describe the differences among the three types of wire line communications media, and discuss the main advantages and disadvantages of each type.
Twisted-pair wire, the most prevalent form of communications wiring, consists of strands of copper wire twisted in pairs. It is relatively inexpensive to purchase, widely available, and easy to work with. However, it is relatively slow for transmitting data, it is subject to interference from other electrical sources, and it can easily be tapped by unintended receivers. Coaxial cable consists of insulated copper wire. It is much less susceptible to electrical interference than is twisted-pair wire, and it can carry much more data. However, coaxial cable is more expensive and more difficult to work with than twisted-pair wire. It is also somewhat inflexible
Differentiate between the Internet and the World Wide Web, and describe the most common methods for accessing the Internet.
The internet is a global network of computer networks, using a common communications protocol. TCP/IP. The World Wide Web is a system that stores, retrieves, formats, and displays information accessible through a browser.
Methods for connecting to the Internet include dial-up, DSL, cable modem, satellite, wireless, and fiber to the home. Identify six major categories of network applications, provide an example of each, and explain how that application supports business functions.
• Discovery involves browsing and information retrieval, and provides users the ability to view information in databases, download it, and/or process it. Discovery tools include search engines, directories, and portals. Discovery tools enable business users to efficiently find needed information.
• Network provide fast, inexpensive communications, via e-mail, call centers, chat rooms, voice communications, and blogs. Communications tools provide business users with a seamless interface among team members, colleagues, business partners and customers.
• Collaboration refers to mutual efforts by two or more entities (individuals, groups, or companies) who work together to accomplish tasks. Collaboration is enabled by workflow system. Collaboration tools enable business users to collaborate with colleagues, business partners, and customers.
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