Discovering Computer 2011 – Living in a Digital World
Lecturer : Tri Djoko Wahjono
- A communications channel is the media on which data, instructions, or information travel. (True)
- With video messaging, users can send short video clips, usually about 15 minutes, in addition to all picture messaging services. (False)
- A network is a collection of computers and devices connected together via communications devices and transmission media. (True)
- 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)
- A Web server is a computer that delivers requested Web pages to your computer. (True)
- An intranet is an internal network that uses Internet technologies. (True)
- The 40-Gigabit Ethernet standard is the fastest of the Ethernet standards. (False)
- Bluetooth does not require line-of-sight transmission. (True)
- At distances of 10 meters (about 33 feet), the data transfer rate for UWB devices is 480 Mbps. (False)
- Fiber to the Premises (FTTP) uses fiber-optic cable to provide extremely high-speed Internet access to a user’s physical permanent location. (True)
- Latency is the time it takes a signal to travel from one location to another on a network. (True)
- C. Visual voice mail
- C. A Web conference
- C. Provides for storage and management of a company’s documents
- D. Mashup
- B. Hubs and switches
- A. RFID
- D. Coaxial cable
- B. Mobile TV
- 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
- Groupware, j. software that helps groups of people share information over a network
- Extranet, h. allows customers or suppliers to access part of a company’s intranet
- IrDA, d. specification to transmit data wirelessly among computers and devices via infrared light waves
- ATM, f. service that carries voice, data, video, and multimedia at very high speeds
- 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
- Digital modem, g. communications device that sends and receives data and information to and from a digital line
- Bandwidth, b. amount of data, instructions, and information that can travel over a
- Transmission media, c. materials or substances capable of carrying one or more signals
- Noise, i. electrical disturbance that can degrade communications
- – 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.
- – 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.
- – 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.
- – 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.
- – 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.