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| A network is a | connected system of objects or people. |
| The link can be made through a variety of | copper or fiber-optic cables or it can be a wireless connection that uses radio signals, infrared technology (laser), or even satellite transmission |
| The server is a repository for files that can be | accessed and shared across the network by many users. |
| network file services can enable the timely distribution of | key files to a group of users |
| networks enable users to share | files, data, games and entertainment, and printing devices |
| Registry | a hierarchical database in which initialization information is saved on individual PCs |
| The software vendors licensing agreement may require the purchase of | additional licenses for each workstation that uses a network application, even though only one copy is actually installed and all users are accessing that same copy. |
| E-mail works as a | "store-and-forward" application |
| E-mail services work like the postal system, with one computer taking on the function of | "post office" |
| The users e-mail account operates like a post office box, where mail is | held for the user until it is picked up over the network by an e-mail "client" program running in the users system. |
| Network directory and name services can translate names into | the addresses used to communicate with the desired service. |
| The Internet is a worldwide public network of | networks, interconnecting thousands of smaller networks to form one large "web" of communication |
| Computer networks are dynamic, meaning | they change and grow in response to new technologies and user requirements |
| Network administrator responsibilities include setting up new | user accounts and services, monitoring network performance, and repairing network failures. |
| Network administrators must measure the benefits of the new features against the | issues, costs, and problems that they may introduce to the network. |
| Network Administrators responsibilities | setting up new user accounts and service, monitoring network performance, troubleshooting & repair |
| Simplex Transmission | signal travels in only one direction |
| Half-Duplex Transmission | Signal can travel in both directions but only one way at a time |
| Example of Half-Duplex Transmission | Two-way radios or walkie-talkie |
| Modems are | half-duplex devices. |
| Full-Duplex Transmission | signal can travel in both directions at the same time |
| DSL, two-way cable modem | Examples of Full-Duplex Transmission |
