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Chapter 7: Computer Networks   TRUE/FALSE        1

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TRUE/FALSE

 

     1.   A network, in general, is a connected system of objects or people.

 

 

     2.   Mobile phones are also called wireless phones.

 

     3.   The most common type of mobile phone is the satellite phone.

 

     4.   GPS receivers are commonly used by individuals to determine their geographic location while hiking and to obtain driving directions while traveling.

 

     5.   Some monitoring systems in use today use the RFID tags and RFID readers to monitor the status of objects (such as shipping boxes, livestock, or expensive equipment) to which the RFID tags are attached.

 

     6.   PC conferencing is the use of networking technology to conduct real-time, face-to-face meetings between individuals physically located in different places.

 

     7.   Collaborative computing takes place via both private company networks and the Internet.

 

     8.   Physicians can use telemedicine to perform remote diagnosis of patients.

 

     9.   In a bus network, all the networked devices connect to a central device (such as a server or a switch) through which all network transmissions are sent.

 

   10.   Client-server networks include both clients and servers.

 

   11.   Transferring data from a client PC to a server is referred to as downloading.

 

   12.   A personal area network (PAN) is a network of personal devices for one individual, such as his or her portable computer, mobile phone, and printer.

 

   13.   The conventional phone system uses digital signals.

 

   14.   When parallel transmission is used, the message is sent at least one byte at one time with each bit in the byte taking a separate path.

 

   15.   The accompanying figure shows a coaxial cable, in which pairs of copper wires are insulated with a plastic coating and twisted together.

 

   16.   Communications satellites are space-based devices launched into orbit around the earth to receive and transmit microwave signals to and from earth.

 

   17.   TCP/IP is the protocol used for transferring data over the Internet.

 

   18.   Because geosynchronous satellites are so close above the surface of the earth, there is no delay while signals travel from earth, to the satellite, and back to earth again.

 

   19.   One of the early Ethernet protocols (called 10BASE-T) supports transmission rates of 10 Mbps.

 

   20.   In general, Wi-Fi is designed for medium-range data transfers—typically between 100 and 300 feet both indoors and outdoors.

 

MODIFIED TRUE/FALSE

 

     1.   A(n) computer network is a collection of computers and other hardware devices connected together so that network users can share hardware, software, and data, as well as electronically communicate with each other. _________________________

 

 

     2.   The most common type of mobile phone is the cellular (cell) phone. _________________________

 

 

     3.   The RedStar system built into many GM cars uses GPS to locate vehicles when the occupant activates the service or when sensors indicate that the car was involved in an accident. _________________________

 

 

 

     4.   Electronic medical monitors are available that take the vital signs of an individual (such as weight, blood-sugar readings, or blood pressure) or prompt individuals to answer questions. _________________________

 

 

     5.   With telesurgery, at least one of the surgeons performs the operation by controlling the robot remotely, such as over the Internet or another network. _________________________

 

     6.   A(n) star network uses a number of different connections between network devices so that data can take any of several possible paths from source to destination. _________________________

 

 

 

 

     7.   The accompanying figure illustrates a(n) ring network. _________________________

 

     8.   With a(n) partial mesh topology, some devices are connected to all other devices, but some are connected only to those devices with which they exchange the most data. _________________________

 

 

     9.   With a(n) peer-to-peer (P2P) network, a central server is not used. _________________________

 

   10.   A(n) small area network (SAN) is a network that covers a relatively small geographical area, such as a home, office building, or school. _________________________

 

   11.   Most networking media send data using analog signals. _________________________

 

 

   12.   TCP/IP uses a technique called packet switching to transmit data over the Internet. _________________________

 

   13.   Support for TCP/IP is built into virtually all operating systems, and TCP addresses are commonly used to identify the various computers and devices on networks such as LANs. _________________________

 

   14.   Wi-Fi is a wireless standard that is designed for very short-range (10 meters, approximately 33 feet, or less) connections. _________________________

 

 

   15.   Because there may be many Bluetooth devices within range, up to 10 individual Bluetooth networks (called piconets) can be in place within the same physical area at one time. _________________________

 

 

MULTIPLE CHOICE

 

     1.   One type of mobile phone that is not commonly used is the ____.

a.	roaming phone	c.	satellite phone
b.	landline phone	d.	analog phone

 

 

 

     2.   The ____ network consists of 24 Department of Defense satellites that are used for location and navigation purposes.

a.	location positioning system (LPS)	c.	cellular phone
b.	satellite positioning system (SPS)	d.	global positioning system (GPS)

 

 

 

     3.   An emerging type of mobile phone is the cellular/satellite ____ phone that can be used with cellular service when it is available and then switches to satellite service when cellular service is not available.

a.	dual-mode	c.	duplex
b.	dual-core	d.	digital

 

 

 

     4.   A global positioning system (GPS) consists of ____ and a group of GPS satellites.

a.	GPS transmitters	c.	GPS amplifiers
b.	Wi-Fi receivers	d.	GPS receivers

 

 

 

     5.   Some monitoring systems today use ____.

a.	IrDA technology	c.	RFID technology
b.	cellular technology	d.	Bluetooth

 

 

 

     6.   The ____ allows individuals to “placeshift” multimedia content from their home TVs and DVRs to their portable computer or mobile device.

a.	Singbox	c.	Singmedia
b.	Slingbox	d.	Shiftmedia

 

 

 

     7.   Monitoring systems may also use ____—devices that respond to a stimulus (such as heat, light, or pressure) and generate an electrical signal that can be measured or interpreted.

a.	transmitters	c.	IAs
b.	interpreters	d.	sensors

 

 

 

     8.   ____ is the use of networking technology to conduct real-time, face-to-face meetings between individuals physically located in different places.

a.	Online conferencing	c.	Phone conferencing
b.	Videoconferencing	d.	VoIP conferencing

 

 

 

     9.   Microsoft Office markup tools and specialized ____ are used in conjunction with networking technology to allow multiple individuals to edit and make comments in a document without destroying the original content.

a.	collaboration software	c.	job software
b.	online software	d.	OCR software

 

 

 

   10.   ____ is the use of networking technology to provide medical information and services.

a.	Telecommuting	c.	Telemedicine
b.	Remote medicine	d.	Remote health

 

 

   11.   In a ____, there are a number of different connections between the devices on the network so that data can take any of several possible paths from source to destination.

a.	bus network	c.	ring network
b.	star network	d.	mesh network

 

 

 

 

 

   12.   The accompanying figure shows a ____ network.

a.	star	c.	bus
b.	ring	d.	mesh

 

 

 

   13.   A ____ is a network that covers a relatively small geographical area, such as a home, office building, or school.

a.	small area network (SAN)	c.	local area network (LAN)
b.	metropolitan area network (MAN)	d.	personal area network (PAN)

 

 

 

   14.   Some wireless ____ are created by cities or large organizations to provide free or low-cost Internet access to residents of a particular area.

a.	WANs	c.	LANs
b.	MANs	d.	PANs

 

 

 

   15.   ____ refers to the amount of data that can be transferred (such as over a certain type of networking medium) in a given time period.

a.	Bandwidth	c.	Modulation
b.	Bluetooth	d.	Throughband

 

 

   16.   With ____, data is sent one bit at a time, one after the other along a single path.

a.	serial transmission	c.	digital transmission
b.	parallel transmission	d.	wireless transmission

 

 

   17.   In ____ transmission, data is sent at the same time as other related data to support certain types of real-time applications that require the different types of data to be delivered at the proper speed for that application.

a.	synchronous	c.	asynchronous
b.	isochronous	d.	endrosynchronous

 

 

 

   18.   The technique used for data sent over the Internet is ____.

a.	docket switching	c.	packet switching
b.	wideband switching	d.	data switching

 

 

 

   19.   ____ transmission is relatively uncommon in data transmissions since most devices that are mainly one-directional, such as a printer, can still transmit error messages and other data back to the computer.

a.	Half-duplex	c.	Full-duplex
b.	Simplex	d.	Asynchronous

 

 

 

   20.   In ____ transmission, data can travel in either direction, but only in one direction at a time.

a.	duplex	c.	half-simplex
b.	simplex	d.	half-duplex

 

 

 

   21.   In ____ transmission, data can move in both directions at the same time, such as with a telephone.

a.	full-duplex	c.	half-simplex
b.	full-simplex	d.	half-duplex

 

 

 

   22.   ____ was originally developed to carry a large number of high-speed video transmissions at one time, such as to deliver cable TV service.

a.	Twisted-pair cable	c.	Coaxial cable
b.	Fiber-optic cable	d.	Single-wire cable

 

 

 

   23.   The accompanying figure displays a ____.

a.	coaxial cable	c.	fiber-optic cable
b.	twisted pair cable	d.	single-wire cable

 

 

   24.   ____ transmissions are used with cell phones and are sent and received via cellular (cell) towers.

a.	PM radio	c.	Cellular radio
b.	Wi-Fi radio	d.	Satellite radio

 

   25.   ____ are earth-based stations that can transmit microwave signals directly to each other over distances of up to about 30 miles.

a.	Satellite stations	c.	Wi-Fi stations
b.	RFID stations	d.	Microwave stations

 

 

   26.   ____ satellites travel at a speed and direction that keeps pace with the earth’s rotation, so they appear (from earth) to remain stationary over a given spot.

a.	Microwave	c.	Isochronous
b.	Geosynchronous	d.	Full-duplex transmission

 

 

   27.   ____ is typically used with LANs that have a star topology and can be used in conjunction with twisted-pair, coaxial, or fiber-optic cabling.

a.	Ethernet	c.	Wi-Fi
b.	Token Ring	d.	80xx2.11

 

 

 

   28.   ____ is a current Wi-Fi standard; supports data transfer rates of 54 Mbps and uses the same 2.4 GHz frequency as 802.11b, so their products are compatible.

a.	802.11a	c.	802.11n
b.	802.11g	d.	802.11x

 

 

 

   29.   The original first-generation cell phones were ____ and designed for voice data only.

a.	digital	c.	analog
b.	discrete	d.	magnetic

 

 

 

   30.   Similar to Wi-Fi, ____ is designed to provide Internet access to fixed locations (sometimes called hotzones), but the coverage is significantly larger.

a.	WinMax	c.	WiMAX
b.	EMax	d.	802.11b

 

 

 

   31.   ____ is a wireless standard that is designed for very short-range (10 meters, approximately 33 feet, or less) connections.

a.	IrDA	c.	Wi-Fi
b.	xMax	d.	Bluetooth

 

 

 

   32.   A new standard that is designed to connect peripheral devices, similar to Bluetooth, but that transfers data more quickly is ____.

a.	WiMAX	c.	Mobile-Fi
b.	xMax	d.	wireless USB

 

 

 

   33.   A network adapter, also called a ____ when it is in the form of an expansion card, is used to connect a computer to a network.

a.	network interface card (NIC)	c.	data communications card (DCC)
b.	powerline card	d.	USB

 

 

 

   34.   Technically, to be called a ____, a device must convert digital signals (such as those used by a computer) to modulated analog signals (such as those used by conventional telephone lines) and vice versa.

a.	hub	c.	switch
b.	modem	d.	router

 

 

 

   35.   A ____ transmits all data received to all network devices connected to it, regardless of which device the data is being sent to.

a.	bridge	c.	gateway
b.	router	d.	hub

 

 

 

Case-Based Critical Thinking Questions

 

Case 7-1

Robert is a medical writer for a pharmaceutical company. The company allows Robert to work from home.

 

   36.   Every day, Robert uses ____ to have a real-time, face-to-face meeting with his boss.

a.	intranets	c.	virtual networks
b.	telemarketing	d.	videoconferencing

 

 

 

   37.   Robert’s job is a(n) ____ job.

a.	telemarketing	c.	videoconferencing
b.	telecommuting	d.	e-working

 

 

 

Case-Based Critical Thinking Questions

 

Case 7-2

Gabrielle is the network administrator at a medium-sized company. One of her responsibilities is to purchase network devices to maintain the company network.

 

   38.   Gabrielle realizes that to improve network performance, she needs to buy and install a ____, which identifies the device on the network for which the data is intended and sends the data to that device only.

a.	switch	c.	bus
b.	node	d.	bridge

 

 

 

   39.   Gabrielle would like to purchase a new ____, which would be used to connect the company’s LAN and the Internet.

a.	hub	c.	router
b.	USB port	d.	bridge

 

 

 

   40.   Gabrielle is planning to connect selected devices to the network wirelessly with a wireless ____.

a.	hotspot	c.	hub
b.	access point	d.	data point

 

 

 

COMPLETION

 

     1.   The term communications, when used in a computer context, refers to ____________________.

 

 

     2.   ____________________ are phones that use a wireless network for communications instead of being connected to the regular telephone network via a conventional telephone jack.

 

     3.   ____________________ phones are most often used by individuals—such as soldiers, journalists, wilderness guides, and researchers—traveling in remote areas where continuous cellular service might not be available.

 

 

     4.   The ____________________ is a satellite-based location and navigation system.

 

 

     5.   ____________________ networking devices (such as digital media receivers) can be used to share and deliver digital content throughout the home via a multimedia network.

 

 

     6.   ____________________ networks can be used during transport to monitor the temperature inside cargo containers to ensure that products stay within the allowable temperature range.

 

     7.   A Slingbox is designed to ____________________ multimedia content—that is, to allow viewers to view content of their choosing at a more convenient location.

 

 

     8.   Videoconferencing can take place via a personal computer and the Internet (sometimes called ____________________) or via a dedicated videoconferencing setup.

 

     9.   ____________________ is a form of robot-assisted surgery, in which a robot controlled by a physician operates on the patient.

 

 

   10.   The physical ____________________ of a computer network indicates how the devices in the network are arranged.

 

 

   11.   With a(n) ____________________ topology, each device on the network has a connection to every other device on the network.

 

 

   12.   A(n) ____________________ is a network that covers a large geographical area.

 

   13.   A(n) ____________________ is a private network, such as a company LAN, that is set up by an organization for use by its employees

 

 

   14.   ____________________ are set up like the Internet, with data posted on Web pages that are accessed with a Web browser.

 

 

   15.   A company network that is accessible to authorized outsiders is called a(n) ____________________.

 

   16.   In ____________________ transmission, data is sent when it is ready to be sent, without being synchronized.

 

 

   17.   ____________________ cabling can be used with both analog and digital data transmission and is commonly used for LANs.

 

 

   18.   ____________________ cable is the newest and fastest wired transmission medium.

 

 

   19.   Backed by seven major electronics companies, ____________________ is designed to transfer full-quality uncompressed high-definition audio, video, and data within a single room at speeds up to 25 Gbps.

 

   20.   The accompanying figure shows a(n) ____________________.

 

 

ESSAY

 

     1.   List some common uses for computer networks.

 

 

     2.   Define and discuss the advantages of telecommuting.

 

 

     3.   Describe the star network topology.

 

     4.   What is a virtual private network (VPN)?

 

     5.   Describe the TransferJet wireless standard.