Chapter 9 Solution

Discovering Computer 2011 – Living in a Digital World
Page 503-504
Lecturer : Tri Djoko Wahjono

True/False

  1. A communications channel is the media on which data, instructions, or information  travel. (True)
  2. With video messaging, users can send short video clips, usually about 15 minutes, in addition to all picture messaging services. (False)
  3. A network is a collection of computers and devices connected together via communications devices and transmission media. (True)
  4. A local area network (LAN) is a network that covers a large geographic area using a communications channel that combines many types of media such as telephone lines, cables, and radio waves. (False)
  5. A Web server is a computer that delivers requested Web pages to your computer. (True)
  6. An intranet is an internal network that uses Internet technologies. (True)
  7. The 40-Gigabit Ethernet standard is the fastest of the Ethernet standards. (False)
  8. Bluetooth does not require line-of-sight transmission. (True)
  9. At distances of 10 meters (about 33 feet), the data transfer rate for UWB devices is 480 Mbps. (False)
  10. Fiber to the Premises (FTTP) uses fiber-optic cable to provide extremely high-speed Internet access to a user’s physical permanent location. (True)
  11. Latency is the time it takes a signal to travel from one location to another on a network. (True)

Multiple Choice

  1. C. Visual voice mail
  2. C. A Web conference
  3. C. Provides for storage and management of a company’s documents
  4. D. Mashup
  5. B. Hubs and switches
  6. A. RFID
  7. D. Coaxial cable
  8. B. Mobile TV

Matching

  1. Picture messaging, e. allows users to send pictures and sound files, as well as short text messages, to a phone or other mobile device, or a computer
  2. Groupware, j. software that helps groups of people share information over a network
  3. Extranet, h. allows customers or suppliers to access part of a company’s intranet
  4. IrDA, d. specification to transmit data wirelessly among computers and devices via infrared light waves
  5. ATM, f. service that carries voice, data, video, and multimedia at very high speeds
  6. Dial-up modem, a. communications device that can convert digital signals to analog signals and analog signals to digital signals, so that data can travel along an analog telephone line
  7. Digital modem, g. communications device that sends and receives data and information to and from a digital line
  8. Bandwidth, b. amount of data, instructions, and information that can travel over a
    communications channel
  9. Transmission media, c. materials or substances capable of carrying one or more signals
  10. Noise, i. electrical disturbance that can degrade communications

Short Answer

  1. What is text messaging?
    Text messaging is a process where users sends and receives short text messages, typically fewer than 300 characters, on a phone or other mobile device or computer.
    – What are some options for sending and receiving text messages?
    Mobile to Mobile: send a message from your mobile device to another mobile device. Mobile to E-Mail: send a message from your mobile device to an e-mail address anywhere in the world. Web to Mobile: send a message from a text messaging Web site to a mobile device, or request that a Web site alert a mobile device with messages of breaking news and other updates, such as sports scores, stock prices, and weather forecasts. Mobile to Provider: send a message by entering a common short code (CSC), which is a four- or five-digit number assigned to a specific content or wireless service provider, followed by the message, such as a vote for a television program contestant or an entry for a sweepstakes.
  2. Describe how the global positioning system (GPS) works.
    GPS satellites orbit Earth. Every thousandth of a second, each satellite sends a signal that indicates its current position to the GPS receiver. GPS receiver (such as in a car, a wearable device, a smart phone, a handheld device, or a collar) determines its location on Earth by analyzing at least 3 separate satellite signals from the 24 satellites in orbit.
    – How do individuals use GPS technology?
    Individuals use GPS technology by using smart phones or GPS receiver.
  3. How are a local area network (LAN), a metropolitan area network (MAN), and a wide area network (WAN) different?
    A local area network (LAN) is a network that connects computers and devices in a limited geographical area such as a home, school computer laboratory, office building, or closely positioned group of buildings. A metropolitan area network (MAN) is a high-speed network that connects local area networks in a metropolitan area such as a city or town and handles the bulk of communications activity across that region. A wide area network (WAN) is a network that covers a large geographic area (such as a city, country, or the world) using a communications channel that combines many types of media such as telephone lines, cables, and radio waves.
    – What is a wireless LAN?
    A wireless LAN (WLAN) is a LAN that uses no physical wires.
  4. What is a network topology?
    A network topology refers to the layout of the computers and devices in a communications network.
    – What are the five types of digital dedicated lines?
    Five types of digital dedicated lines are ISDN lines, DSL, FTTP, T-carrier lines, and ATM.
  5. What are three different types of digital modems?
    Three types of digital modems are ISDN modems, DSL modems, and cable modems.
    – How does each one function?
    An ISDN modem sends digital data and information from a computer to an ISDN line and receives digital data and information from an ISDN line. A DSL modem sends digital data and information from a computer to a DSL line and receives digital data and information from a DSL line. A cable modem, sometimes called a broadband modem, is a digital modem that sends and receives digital data over the cable television (CATV) network.
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