Chapter 9 Sol
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So f t w are De v e l opme n t Unit 2 2 0 1 0 C hap ter 9 – C om muni c ati on s and N etwor k s Tr u e/ Fa l se 1. TRUE - A comm u n icat i o ns cha n n el i s t h e media on w h i ch d ata, instruct i o ns o r i n f o r m at i on t r avel. 2. F A LSE - Wit h v i d eo mess ag i n g , u ser s can sen d sho r t vi d eo cl i p s, u su al l y a b ou t 15 m i n ut es, i n ad d iti o n t o al l p ict u re m essagi ng ser v i ces. 3 . TRUE - A n et w or k is a c ol l ect i on of com p u t er s and d evi ces con n ect ed t og et h er vi a comm unicat i on s devices andt r an sm issionm ed i a. 4 . F A LSE - A l ocal area net w ork ( L A N ) i s a n et w ork t h at cover s a l ar ge g eog r ap h i c ar ea u si n g a com m unicat i on s c h an n el t h at com bi nes m any t yp es of m ed i a such as t el eph on e l ines, cabl es and r ad i o w aves . 5. TRUE - A w eb server i s a c omp uter t hat d el ivers r equ es t ed Web p ages t o you r c omp u t er. 6. TRUE - A n i n tr an et is an int ern al net w or k t h at u ses I n t ern et t ech n o l o g ies. 7 . F A LSE - T h e 40 - G i g ab i t E t h ern et st an d ard is t h e f ast est o f t h e E t h ern et st an d ard s. 8. TRUE - B l u et o oth d o es n ot r eq u i re l i n e- o f-si g h t t r an sm iss i o n . 9. F A LSE - A t d istan ces of 10 met r es ( ab o ut 33 f eet ) , t h e d ata t r an sf er r at e f or U WB d ev i ces i s 480 Mb p s. 10. TRUE - Fi b re t o t h e P r em i ses ( F T T P ) u ser fi b r e- o p ti c cabl e t o p rovi d e ext r em el y h i g h - sp eed I n t ernet access t o a user’ s p hy sical p erm an en t l o cat i o n . 11. TRUE - L at en cy i s t h e t i m e i t t ak es a si g n al t o trave l from o n e l o cat i o n t o a n o ther ona net w o r k . Mu l tip l e C h oice 1. Wi t h ( C ) VISUA LV O I C EMAIL , u sers can v i ew m essage d etails such as t h e l en g t h o f cal l s an d, in some cases, read m ess ag e con t en t s i nstead of l i st en in g to t h em. 2. Wh en an on l i n e m eet i n g t akes p l ace on t h e Web, it is c al l ed ( C) WEBCO N FERE N CE. 3. A doc ume nt mana ge m e nt sys t e m ( C) P ROV I D E SF O RST O RAG EAN D MAN AG E ME N TO F A COMP AN Y’ S D O CUME N TS . 4. A( D ) MASHUP i s a Web ap p l i cat iont h at com bi n es s er v i ces f r om t w o or m ore sou rces , cr eati n g a n ew ap p l icat i on. 5. (B) S WI TCHES A N D H U BS are dev i ces t hat p r ov ide a comm oncentral con n ect ion p oi nt f or no d es on t he n et w or k. 6. ( A ) R FI D i s a stan d ard, speci fi cal l y a p r ot o col , t h at d e fi n es h owa net w o r k uses r ad i o si g n al s t o com m unicat e w ith a t ag placed i n or attachedto an ob j ect , an ani m al , or a p er son. 7. (D) CO A XI A LCA BLE con si st s of a si n g l e cop p er w ire s u rr o u n d ed by at l east t h ree l aye rs . 8. (B) MO BILE TV i s a service t h at p rovides t el ev i si o n p rog r ams over t h e cel l u l ar n et w o r k . Matchi ng 1. Pict u r e Messagi n g – a l l ow s u sers to send pict u r es an d sou n d fi l es, as w el l as sho rt t ext m ess ag es t o p h on e or ot h er m ob il e d evi ce or a c omp uter. 2. G r oupw a r e – sof t w ar e t h at h el p s grou p s of p eop le share inf orm at i on over a net w ork. 3. Extranet – al l ow s cu s t omer s or sup p l iers t o acces s part o f a com p an y ’s i n t r an et . 4 . I r D A – sp eci fi cati on s to tr an sm i t d ata wir el ess l y among com p u ter s an d d ev ices v i a i n f r ared l i g h t w aves. 5. AT M – A syn chronou s Tr an sf er M od e – ser v ice that car ri es voi ce, data, v i d eo and m u l t i m edia at ver y h i gh s p eeds. 6 . D i al - up m odem – comm u nicat i o n s d ev i ce t h at can con vert d i g it al si g n al s to an al og u e si g n al s an d an al o g u e si g n als to d i g ital si g n als, so tha t dat a can t r ave l al o n g an an al o g u e t el ep h o n e l i n e. 7. Digit al m od em – comm uni cat ion s dev i ce t h at s end s and r ec ei ves dat a an d in f ormat i on t o an d f r om a d i g i t a l l ine. Pag e 1 of 5
Transcript of Chapter 9 Sol
Software Development Unit 2 2010
Chapter 9 – Communications and Networks
True/False1. TRUE - A communications channel is the media on which data, instructions or information travel.
2. FALSE - With video messaging, users can send short video clips, usually about 15 minutes, in
addition to all picture messaging services.
3. TRUE - A network is a collection of computers and devices connected together via communications
devices and transmission media.
4. FALSE - 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.
5. TRUE - A web server is a computer that delivers requested Web pages to your computer.
6. TRUE - An intranet is an internal network that uses Internet technologies.
7. FALSE - The 40-Gigabit Ethernet standard is the fastest of the Ethernet standards.
8. TRUE - Bluetooth does not require line-of-sight transmission.
9. FALSE - At distances of 10 metres (about 33 feet), the data transfer rate for UWB devices is 480 Mbps.
10.TRUE - Fibre to the Premises (FTTP) user fibre-optic cable to provide extremely high-speed Internet
access to a user’s physical permanent location.
11.TRUE - Latency is the time it takes a signal to travel from one location to another on a network.
Multiple Choice1. With(C) VISUAL VOICE MAIL, users can view message details such as the length of calls and, in
some cases, read message contents instead of listening to them.
2. When an online meeting takes place on the Web, it is called(C) WEB CONFERENCE.
3. A document management system(C) PROVIDES FOR STORAGE AND MANAGEMENT OF A
COMPANY’S DOCUMENTS.
4. A(D) MASHUP is a Web application that combines services from two or more sources, creating a
new application.
5. (B) SWITCHES AND HUBS are devices that provide a common central connection point for nodes
on the network.
6. (A) RFID is a standard, specifically a protocol, that defines how a network uses radio signals to
communicate with a tag placed in or attached to an object, an animal, or a person.
7. (D) COAXIAL CABLE consists of a single copper wire surrounded by at least three layers.
8. (B) MOBILE TV is a service that provides television programs over the cellular network.
Matching1. Picture Messaging – allows users to send pictures and sound files, as well as short text messages to
phone or other mobile device or a computer.
2. Groupware – software that helps groups of people share information over a network.
3. Extranet – allows customers or suppliers to access part of a company’s intranet.
4. IrDA – specifications to transmit data wirelessly among computers and devices via infrared light
waves.
5. ATM – Asynchronous Transfer Mode – service that carries voice, data, video and multimedia at very
high speeds.
6. Dial-up modem – communications device that can convert digital signals to analogue signals and
analogue signals to digital signals, so that data can travel along an analogue telephone line.
7. Digital modem – communications device that sends and receives data and information to and from
a digital line.
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8. Bandwidth – amount of data, instructions, and information that can travel over a communications
channel.
9. Transmission media – materials or substances capable of carrying one or more signals.
10.Noise – electrical disturbance that can degrade communications.
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Short Answer
1.What is text messaging?
SMS (Short Message Service) - Short note, typically fewer than 300 characters, sent to or from a smart
phone or other mobile device.
What are some of the options for sending and receiving text messages?
Mobile to Mobile – send your 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 is a navigation system that consists of one or more earth-based receivers that accept and analyse
signals sent by a satellite in order to determine the receiver’s geographic location.
How do individuals use GPS technology?
They use them to: creating maps, ascertaining the best route between two points, locating a lost
person or stolen object, monitoring the movement of a person or object, determining altitude, and
calculating speed.
3.How are a local area network (LAN), a metropolitan area network (MAN), and a wide area
network (WAN) different?LAN – a network that connects computers and devices in a limited geographic location such as a
home, school computer laboratory, office building or closely positioned group of buildings.
MAN – a high-speed network that connects LANs in a metropolitan area such as a city or suburb
and handles the bulk of communications activities across that region. A MAN typically contains one
or more LANs, but covers a smaller geographic area than a WAN.
WAN – a network that covers a large geographic area such as a city, country or the entire world,
using a communications channel that combines many types of media such as telephone lines, cables
and radio waves. A WAN can be one large network or can consist of two or more LANs connected
together. The Internet is the world’s largest WAN.
What is wireless LAN?
Is a LAN that uses no physical wires.
4.What is a network topology?
Refers to the layout of the computers and devices in a communications network. Three commonly
used topologies are Star, Bus and Ring.
What are the five types of digital dedicated lines?
A dedicated line is a type of always-on connection that is established between two communication
devices..
ISDN lines – (Integrated Services Digital Network) is a set of standards for digital transmission of
data over standard copper telephone lines.
DSL – (Digital Subscriber Line) transmits data at fast speeds on existing standard copper telephone
lines.
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FTTP – Fibre to the Premises (FTTP) user fibre-optic cable to provide extremely high-speed Internet
access to a user’s physical permanent location.
T-carrier lines – is any of several types of long distance digital telephone lines that carry multiple
signals over a single communications line. The most popular T-carrier line is the T1 line.
ATM - Asynchronous Transfer Mode – service that carries voice, data, video and multimedia at very
high speeds.
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5.What are the three different types of digital modems? How does each one function?
Dial-up modems – is a communications device that can convert digital signals to analogue signals
and analogue signals to digital signals, so that data can travel along an analogue telephone line.
Digital Modem - communications device that sends and receives data and information to and from
a digital line.
Examples are:
• ISDN modem – external device that sends digital data from computer to ISDN line and vice
versa.
• DSL modem – external device that sends digital data from computer to DSL line and vice
versa.
• Cable modem (broadband modem) – external device that sends and receives data over the
cable television network (CATV)
Wireless Modem – uses the cell phone network to connect to the Internet wirelessly from a
computer, a smart phone, or other mobile devices.
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