Assignment assigned by Mr. Tri Djoko Wahjono
A. True/False Mark T for True and F for False.
1. A communications channel is the media on which data, instructions, or information travel. (460)(False)
2. With video messaging, users can send short video clips, usually about 15 minutes, in addition to all picture messaging services. (464)(False)
3. A network is a collection of computers and devices connected together via communications devices and transmission media. (470)(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. (472)(False)
5. A Web server is a computer that delivers requested Web pages to your computer. (474)(True)
6. An intranet is an internal network that uses Internet technologies. (477)(True)
7. The 40-Gigabit Ethernet standard is the fastest of the Ethernet standards. (478)(False)
8. Bluetooth does not require line-of-sight transmission. (480)(True)
9. At distances of 10 meters (about 33 feet), the data transfer rate for UWB devices is 480 Mbps.(480)(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. (484)(True)
11. Latency is the time it takes a signal to travel from one location to another on a network. (491)(True)
B. Multiple Choice Select the best answer.
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
C. Matching Match the terms with their definitions.
1. 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. J. software that helps groups of people share information over a network
3. H. allows customers or suppliers to access part of a company’s intranet
4. D. specification to transmit data wirelessly among computers and devices via infrared light waves
5. F. service that carries voice, data, video, and multimedia at very high speeds
6. 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. G. communications device that sends and receives data and information to and from a digital line
8. B. amount of data, instructions, and information that can travel over a communications channel
9. C. materials or substances capable of carrying one or more signals
10. I. electrical disturbance that can degrade communications
D. Short Answer Write a brief answer to each of the following questions.
1. Text Messaging, also called SMS (short message service), capability allows users to send and receive short text messages, typically fewer than 300 characters, on a phone or other mobile device or computer.
Text messaging services typically provide users with several options for sending and receiving messages:
• Mobile to Mobile: send a message from your mobile device to another mobile device
• Mobile to E-Mail: send a message from you 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 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. A global positioning system (GPS) is a navigation system that consists of one or more earth-based receivers that accept and analyze signals sent by satellites in order to determine the receiver’s geographic location .So, GPS works by receiving signals sent by the satellites and analyze the sent signals. Nowadays, many vehicles use GPSs to provide drivers with directions or other information, such as alternate traffic routes, automatically call for help if the airbag is deployed, dispatch roadside assistance, unlock the driver’s side door if keys are locked in the car, and track the vehicle if it
is stolen. Newer GPS receivers also give drivers information about nearby points of interest, such as gas stations, restaurants, and hotels. Hikers and remote campers may carry GPS receivers in case they need emergency help or directions.
3. – LAN 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.
– MAN 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
-WAN 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
These explanations lead us to an explanation to the reason of why they all are different. They are different because of the coverage area.
-A wireless LAN (WLAN) is a LAN that uses no physical wires. Computers and devices that access a wireless LAN must have built-in wireless capability or the appropriate wireless network card, USB network adapter, ExpressCard module, PC Card, or flash card. Very often, a WLAN communicates with a wired LAN for access to its resources, such as software, hardware, and the Internet.
4. A network topology refers to the layout of the computers and devices in a communications network. Three commonly used network topologies are star, bus, and ring. Most networks, including the Internet, use combinations of these topologies.
Five types of digital dedicated lines are ISDN lines, DSL, FTTP, T-carrier lines, and ATM
5. Three types of digital modems are ISDN modems, DSL modems, and cable modems. These modems typically include built-in Wi-Fi connectivity.
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. ISDN and DSL modems usually are external devices, in which one end connects to the telephone line and the other end connects to a port on the system unit.
A cable modem, sometimes called a broadband modem, is a digital modem that sendsand receives digital data over the cable television (CATV) network
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