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Chapter 4: Computer Networks   TRUE/FALSE        1

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TRUE/FALSE

 

     1.   A public Internet access point at an airport or a coffeehouse is known as a sweetspot.

 

 

 

     2.   A LAN covers an area about the size of an office building or a school.

 

     3.   An extranet is generally more exclusive than an intranet.

 

     4.   Communication between a computer and a printer is an example of simplex transmission.

 

     5.   Wi-Fi and WiMAX use radio frequencies between 88 MHz and 108 MHz.

 

     6.   IR transmission does not use the radio frequency band.

 

     7.   TCP is the protocol responsible for the delivery of data on the Internet, and IP provides addresses and routing information.

 

     8.   PoE allows electrical power to be sent along the cables in an Ethernet network.

 

     9.   The current standard for cellular networks today in the United States is 4G.

 

   10.   Bridges are devices that amplify signals along a network.

 

MODIFIED TRUE/FALSE

 

     1.   With roaming, individuals work from a remote location (typically their homes) and communicate with their places of business and clients via networking technologies. _________________________

 

 

     2.   When a client retrieves files from a server, it is called uploading. _________________________

 

     3.   The Internet is the world’s largest WAN. _________________________

 

     4.   Output is the amount of data that can be transferred in a given time period. _________________________

 

     5.   Most Internet connections are full-duplex. _________________________

 

     6.   With broadcasting, data is sent out to all nodes on a network and is retrieved only by the intended recipient. _________________________

 

 

     7.   To compensate for the time delay caused by satellites in geosynchronous orbit, GEO satellite systems were developed for use with satellite telephone systems. _________________________

 

 

     8.   The fastest currently available Ethernet standard is 10 Gigabit Ethernet. _________________________

 

     9.   WiMAX is also known as 802.11a. _________________________

 

   10.   Individual Bluetooth networks are called MIFInets. _________________________

 

MULTIPLE CHOICE

 

     1.   Wireless networks usually use ____ signals to send data.

a.	analog	c.	fiber-optic
b.	radio	d.	contiguous modulation

 

 

     2.   A(n) ____ network uses a central cable to which all network devices connect.

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

 

 

 

     3.   The way a network is designed to communicate is known as its ____.

a.	architecture	c.	topology
b.	protocol path	d.	latency

 

 

 

     4.   A(n) ____ is a computer that requests and uses network resources from a(n) ____.

a.	client, peer	c.	ISP, client
b.	server, ISP	d.	client, server

 

 

 

 

     5.   In the accompanying figure, ____ is the first step.

a.	Select a network in the list.	c.	Click Connect.
b.	Click the wireless network icon.	d.	none of the above

 

 

 

     6.   What can you tell from the accompanying figure?

a.	NEPA is a network connected to the Internet.
b.	L8N2L is a secure network.
c.	There are three messages waiting in the Message network.
d.	none of the above

 

 

 

     7.   A network consisting of a person’s portable computer, mobile phone, and digital camera would be considered a ____.

a.	PAN	c.	MAN
b.	LAN	d.	WAN

 

 

 

     8.   Microsoft and Google have created large networks known as ____ to provide free or low-cost Internet access to area residents.

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

 

 

 

     9.   A company network that is accessible to authorized outsiders is called a(n) ____.

a.	WAN	c.	intranet
b.	extranet	d.	VPN

 

 

 

   10.   A(n) ____ is a secure, private path across a public network that is set up to allow authorized users private, secure access to the company network.

a.	LAN	c.	VPN
b.	intranet	d.	Internet P2P network

 

 

 

   11.   Most networking media send data using ____ signals.

a.	flash	c.	analog
b.	digital	d.	contiguous

 

 

 

   12.   With ____ transmission, data is sent one bit at a time.

a.	serial	c.	pulse
b.	parallel	d.	fiber-optic

 

 

 

   13.   Serial transmission may involve any of the following techniques EXCEPT ____.

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

 

 

   14.   In the accompanying figure, the ____ box represents asynchronous transmission.

a.	top	c.	bottom
b.	middle	d.	none of the above

 

 

 

   15.   Most data transmissions within a computer and over a network use the kind of transmission shown in the ____ box in the accompanying figure.

a.	top	c.	bottom
b.	middle	d.	none of the above

 

 

 

   16.   The most common example of a(n) ____ switched network is the conventional telephone system.

a.	circuit	c.	broadcast
b.	packet	d.	isynchronous

 

 

 

   17.   ____ cable is the least expensive type of networking cable and has been in use the longest.

a.	Coaxial	c.	Twisted-pair
b.	Fiber-optic	d.	Packet-switched

 

 

 

   18.   ____ cable uses a single thick copper wire surrounded by insulation and covered with braided wire to block electromagnetic interference.

a.	Fiber-optic	c.	Twisted-pair
b.	CAT5	d.	Coax

 

 

   19.   The biggest advantage of fiber-optic cabling is ____.

a.	ruggedness	c.	price
b.	speed	d.	flexibility

 

 

 

   20.   All wireless applications in the United States use specific frequencies as assigned by the ____.

a.	FTC	c.	NTSB
b.	FCC	d.	W3C

 

 

 

   21.   Most wireless networking applications use frequencies in the ____ band.

a.	RF	c.	IR
b.	audible	d.	UV

 

 

 

   22.   All of the following frequencies are noted in the text as being unlicensed EXCEPT ____.

a.	300 GHz	c.	900 MHz
b.	2.4 GHz	d.	5 GHz

 

 

 

   23.   When a cell tower picks up a phone call from a cell phone, it forwards the call to the ____.

a.	POP	c.	FCC
b.	MTSO	d.	nearest LEO satellite for transmission

 

 

   24.   ____ satellite systems are used most often for GPS.

a.	HEO	c.	Geosynchronous
b.	LEO	d.	MEO

 

 

 

   25.   A communications ____ determines how devices on a network communicate.

a.	protocol	c.	hierarchy
b.	topography	d.	bridge

 

 

 

   26.   The ____ develops networking standards.

a.	ANSI	c.	IEEE
b.	WWW	d.	TCP/IP

 

 

 

   27.   The ____ protocol is used to deliver email over the Internet.

a.	HTTP	c.	FTP
b.	XML	d.	SMTP

 

 

 

   28.   Fast Ethernet has a maximum speed of ____.

a.	10 Mbps	c.	1 Gbps
b.	100 Mbps	d.	10 Gbps

 

 

 

   29.   ____ is an alternative to the Ethernet standard for wired home networks.

a.	HomePNA	c.	both a and b
b.	HomePlug AV	d.	neither a nor b

 

 

 

   30.   ____ technology seeks to deliver broadband Internet to homes via the existing outdoor power lines.

a.	HomePNA	c.	BPL
b.	PoE	d.	WiMAX

 

 

 

   31.   Wi-Fi is designed for medium-range transfers, up to ____ feet outdoors.

a.	100	c.	500
b.	300	d.	900

 

 

 

   32.   The fastest Wi-Fi standard today uses ____ antennas, which can transfer multiple streams of data at one time.

a.	PoE	c.	MIMO
b.	coax	d.	IEEE

 

 

 

   33.   WiMAX can transfer data as far as ____ without line of sight.

a.	900 feet	c.	half a mile
b.	6 miles	d.	3 kilometers

 

 

 

   34.   ____ is the mobile WiMAX standard.

a.	802.11ad	c.	802.MW
b.	802.3	d.	802.16e

 

 

 

   35.   The current standard for cellular networks today in the United States and many other countries is ____.

a.	3G	c.	EDGE
b.	4G	d.	LTE

 

 

 

   36.   ____ is a wireless standard that is designed for very short-range connections, to replace cables between devices.

a.	MIFI	c.	Bluetooth
b.	WiMAX	d.	Red Hat

 

 

 

   37.   Of the following, the standard designed for the fastest transfer speeds is ____.

a.	Bluetooth	c.	WiHD
b.	UWB	d.	TransferJet

 

 

 

   38.   Computers are connected to networks via a ____.

a.	network adapter	c.	both a and b
b.	modem	d.	neither a nor b

 

 

 

   39.   In the accompanying figure, the 802.11 family of standards would be located in box ____.

a.	A	c.	C
b.	B	d.	none of the above

 

 

   40.   In the accompanying figure, the Bluetooth standard would be found in box ____.

a.	A	c.	C
b.	B	d.	none of the above

 

 

 

Case-Based Critical Thinking Questions

 

Case 4-1

Julia is a network consultant, fielding questions from clients during the day, and navigating a wired and wireless world both at the office and at home.

 

   41.   Julia has a client looking to create a network for her mobile phone, headset, digital camera, and PDA. Julia tells her about ____ options.

a.	PAN	c.	intranet
b.	WAN	d.	VPN

 

 

 

   42.   Next, Julia meets with a client who leases four floors in a high-rise downtown. He wants to connect them all to their own network. So Julia explains the various kinds of ____ he should consider.

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

 

 

   43.   Julia drives to her office from the suburbs. At the office, she uses the public wireless network. Six blocks away, at the park where she takes her lunch, she uses the same wireless network. However, when she gets home she needs to use another network. The network Julia uses during her workday is most likely a(n) ____.

a.	LAN	c.	VPN
b.	MAN	d.	extranet

 

 

 

   44.   When Julia gets home at the end of the day, her smartphone automatically syncs with her home computer and transfers the evening’s to-do list. She is using a(n) ____.

a.	PAN	c.	intranet
b.	WAN	d.	VPN

 

 

 

   45.   Julia sometimes accesses her work computer at home via the Internet. She does so knowing that her connection is secure and private. The connection path she uses is an example of a(n) ____.

a.	intranet	c.	VPN
b.	extranet	d.	none of the above

 

 

 

   46.   Julia occasionally works for her friend Jason’s company while at home on the weekend. Jason has made his company LAN available to Julia so she can access the data she needs. Jason’s network must contain a(n) ____.

a.	WAN	c.	extranet
b.	intranet	d.	MAN

 

 

 

Case-Based Critical Thinking Questions

 

Case 4-2

Chuck has asked you to help him learn the dizzying array of new communications technologies being developed today.

 

   47.   You mention to Chuck that a technology is being promoted by both the HomePNA Alliance and the HomeGrid Forum as a unified worldwide standard. Chuck tells you this is the ____ standard.

a.	Powerline	c.	BPL
b.	G.hn	d.	LTE

 

 

   48.   You mention a number of new technologies to Chuck. Chuck knows that the only one that is developed and in production in the United States now is ____.

a.	PoE	c.	4G
b.	802.11ac	d.	LTE

 

 

 

   49.   You ask Chuck what company in the United States is currently developing a WiMAX-based nationwide network. He answers, correctly, ____.

a.	Sprint Nextel	c.	AT&T
b.	Clearwire	d.	both a and b

 

 

   50.   Lastly, you ask Chuck which Ethernet standards are under development now. He provides several answers, all of which are correct EXCEPT ____.

a.	Exobit Ethernet	c.	100 Gigabit Ethernet
b.	Terabit Ethernet	d.	40 Gigabit Ethernet

 

 

 

COMPLETION

 

     1.   The GPS network consists of a total of ____________________ Department of Defense GPS satellites.

 

     2.   Mesh networks are used most often with ____________________ networks.

 

 

     3.   With ____________________ network architecture, a central server is not used.

 

 

     4.   Large WANs typically use a(n) ____________________ topology.

 

 

     5.   Conventional telephone systems use ____________________ signals.

 

     6.   1 Gbps is ____________________ bits per second.

 

 

     7.   In ____________________ transmission, data travels in a single direction only.

 

 

     8.   In ____________________-switched networks, data uses a dedicated path from the sender to the recipient.

 

 

     9.   ____________________ cable transfers data represented by light pulses at speeds of billions of bits per second.

 

 

   10.   The frequencies used by Wi-Fi fall in the ____________________ part of the electromagnetic spectrum, and therefore can be used by any product or individual.

 

 

   11.   ____________________ are space-based devices launched into orbit around the earth to receive and transmit microwave signals.

 

 

   12.   A geosynchronous orbit is found at ____________________ miles above the earth.

 

 

   13.   ____________________ is the current standard for wireless networks in the home or office.

 

   14.   The next generation for mobile phone networks—____________________—is under development.

 

 

   15.   A(n) ____________________ device connects to Verizon Wireless’s 3G mobile network and provides access to that network for up to five Wi-Fi devices.

 

 

MATCHING

 

 

a.	parallel	g.	RF
b.	LAN	h.	G.hn
c.	full-duplex	i.	hotspot
d.	Internet	j.	ZigBee
e.	IPv6	k.	MAN
f.	coax	l.	P2P

 

 

     1.   covers a city or county

 

     2.   a thick wire in the center with insulation surrounding it

 

     3.   a location where a wireless network is broadcasting

 

     4.   a network architecture

 

     5.   promoted by the HomeGrid Forum and HomePNA Alliance

 

     6.   an emerging standard for sensor networks

 

     7.   a transmission type used frequently in computer components like buses

 

     8.   allows for a far greater number of addresses than the previous version

 

     9.   the band in which Wi-Fi is used

 

   10.   the largest computer network in the world

 

   11.   covers a home or an office building

 

   12.   data can move in both directions at the same time

 

ESSAY

 

     1.   Name and describe the three most common physical topologies used in computer networks.

 

 

     2.   When using serial transmission, there are three possible techniques for organizing the bits being transferred. Name and describe them.

 

 

     3.   Name and briefly describe the six communications protocols mentioned in the chapter.