Unauthorized alteration of online records can be prevented by employing:
Answer(s): D
Users can gain access to databases from terminals only through established recognition and authorization procedures: thus, unauthorized access is prevented.
When two devices in a data communications system are communicating, there must be agreement as to how both data and control information are to be packaged and interpreted.Which of the following terms is commonly used to describe this type of agreement?
A protocol is a set of formal rules or conventions governing communication between a sending and a receiving device. It prescribes the manner by which data are transmitted between these communications devices. In essence, a protocol is the envelope within which each message is transmitted throughout a data communications network.
A real estate brokerage firm is moving into a building that is already equipped with extensive telephone wiring. The firm is considering the installation of a digital private branch exchange PBX) to connect computers and other office devices, such as copying machines, printers, and fax machines. A limitation of using a PBX-based system for this network is that:
Answer(s): B
A PBX has the advantage of using existing telephone lines and therefore not needing special wiring. Moreover, equipment can be moved without necessitating rewiring. However, because PBX-based systems use telephone wiring most often copper wire), they cannot easily handle large volumes of data.
Large organizations often have their own telecommunications networks for transmitting and receiving voice, data, and images. Very small organizations, however, are unlikely to be able to make the investment required for their own networks and are more likely to use:
Answer(s): A
Companies can use public switched lines phone lines) on a per-transmission basis. This option is the most cost-effective way for low-volume users to conduct telecommunications.
A local area network LAN) is best described as a(n):
A LAN is a local distributed computer system, often housed within a single building. Computers, communication devices, and other equipment are linked by cable. Special software facilitates efficient data communication among the hardware devices.
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