Exam 9: Communications and Networks

Wireless transmission media are used when it is inconvenient or impossible to install cables.

A voice mailbox is a(n) ____ in a voice mail system.

A(n) ____ is an adapter card, PC Card, or flash card that enables a computer or devices to access a network.

A type of communications device that connects a communications channel to a sending or receiving device is a ____.

Wireless access points have high-quality antennas for optimal signals.

____ is an electrical disturbance that can degrade communications.

Cable modems currently transfer data at speeds that are much slower than either a dial-up modem or ISDN.

Discuss what a dedicated line is and list the different types of dedicated lines.

Critical Thinking Questions Case 1 You have taken a new job as a network administrator. Although you have been an IT professional within your organization for a number of years, this particular responsibility is a new one for you, so you have been studying network topologies, for example. You are very confident about the hub you are going to use in your new network-it's brand-new and highly recommended by some colleagues that you trust. Which of the following network topologies is a good choice for you?

When a computer sends data over the Internet, the data is divided into small pieces, or ____.

Computer ____________________ describes a process in which two or more computers or devices transfer data, instructions, and information.

A(n) ____________________ is a wireless network that provides Internet connections to mobile computers and other devices.

Web services require a specific programming language, operating system, and Web browser.

A(n) ____ is a LAN that uses no physical wires.

Each networked computer in a house can ____.

A ____ is a high-speed network that connects networks in an area such as a city or town and handles the bulk of communications activity across that region.

With ISDN, the same telephone line that could carry only one computer signal now can carry three or more signals at once through the same line, using a technique called ____.

____ allows users to share documents with others in real time.

The ____ standard specifies that computers and devices on the network share or pass a special signal, called a token, in a unidirectional manner and in a preset order.

To help reduce copyright infringement, today's music-sharing services are free, and music files are made public as they travel across the Internet.