Chapter 6.docx

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Computers: Understanding Technology, Fourth Edition
© Paradigm Publishing, Inc. Page 1 of 5
Chapter 6
Telecommunications and Networks
Chapter Outline
Key Terms
Study Questions
The Evolution of Networking
telecommunications
What factors have encouraged the growth
of networking?
Data Transmission
Characteristics
The transmission of data over networks is
characterized by what three factors?
Bandwidth
bandwidth
bits per second (bps)
broadband medium
narrowband medium
Explain the difference between a
broadband medium and a narrowband
medium, and provide examples of
each.
Analog and Digital
Transmission
analog signal
frequency range
pitch
modem
modulation
demodulation
dial-up modem
internal modem
external modem
Personal Computer
Memory Card
International
Association
(PCMCIA) modem
What applications are analog signals used
for?
What system do computers use to
transform data into digital signals?
What are two major functions of
modems?
Explain the difference between an
internal modem and an external
modem.
What is the advantage of each type of
modem?
Parallel and Serial
Transmission
parity bit
serial transmission
parallel transmission
Explain the difference between a parallel
and serial port.
What is the advantage of parallel
transmission?
What are two common connectors for
serial ports?
Communications Media
communications medium
Communications media are classified into
what two broad categories?
Wired Communications Media
Why would a user use wired
communication media instead of
wireless?
Twisted-Pair Cable
twisted-pair cable
What are the advantages of twisted-pair
cable?
Coaxial Cable
coaxial cable
cable modem
What are the advantages of coaxial cable?
What device must be installed to use a
cable modem?
Fiber-Optic Cable
fiber-optic cable
What are five advantages of fiber-optic
cables?
What is the most important advantage of
fiber-optic cables?
Integrated Services Digital
Network (ISDN)Lines
Integrated Services
Digital Network
(ISDN) line
What device is required for the use of an
ISDN line?
Digital Subscriber Line (DSL)
Digital Subscriber Line
(DSL)
What advantage does a DSL offer users
who are connected to the Internet?
Chapter 6
Telecommunications and Networks
Computers: Understanding Technology, Fourth Edition
© Paradigm Publishing, Inc. Page 2 of 5
Chapter Outline
Key Terms
Study Questions
T Lines
T line
T1 line
T3 line
What is a major disadvantage of T lines?
What are two popular types of T lines?
How does a T3 line differ from a T1 line?
Wireless Communications
Media
What six types of technology are included
under the category of wireless
communications media?
Microwave Systems
microwave system
What factor determines the distance
between microwave stations?
Where are microwave stations usually
located and why?
Satellite Systems
communications satellite
transponder
earth station
geosynchronous orbit
Where are communications satellites
positioned?
Explain how a communication satellite
functions.
What is an important benefit of satellite
systems?
For what applications are satellite systems
most appropriate?
Infrared Technology
infrared technology
What are three common uses for infrared
technology?
Cellular Technology
cellular technology
cell
wireless service provider
(WSP)
How do signals sent by cell phones reach
their final destination?
With what mobile devices can wireless
modems be used?
Wi-Fi Technology
Wi-Fi (802.11 protocol)
wireless access point
hotspot
What is the most commonly used wireless
technology today?
How can home networks take advantage
of Wi-Fi technology?
Bluetooth Technology
Bluetooth
What are some common uses of
Bluetooth technology?
Network Classifications
Into what three categories are networks
classified?
Networks Classified by
Architecture
network architecture
What are the two major architectural
designs for networks?
Client/Server Architecture
client/server architecture
client
server
What are the proposes of a server?
What is a major advantage of a
client/server?
Peer-to Peer Architecture
peer-to-peer architecture
What are the advantages and
disadvantages of peer-to peer
architecture?
Networks Classified by
Coverage
What is the difference between local area
networks (LANs) and wide area
networks (WANs)?
Local Area Networks (LANs)
local area network (LAN)
file server
print server
What advantages do LANs offer multiple
users?
Chapter 6
Telecommunications and Networks
Computers: Understanding Technology, Fourth Edition
© Paradigm Publishing, Inc. Page 3 of 5
Chapter Outline
Key Terms
Study Questions
Wide Area Networks (WANs)
wide area network
(WAN)
metropolitan area network
(MAN)
public access network
(PAN)
value added network
(VAN)
virtual private network
(VPN)
What types of organizations are likely to
use WANs?
What are four major types of WANs?
What services are offered by value added
networks (VANs)?
What well-know service provider is a
VAN?
What factors make VPNs an attractive
option?
Networks Classified by Users
Networks can be classified into what two
groups of users?
Intranets
intranet
firewall
Why is it difficult for unauthorized users
to gain access to an intranet?
Extranets
extranet
Why is it difficult for unauthorized users
to gain access to an extranet?
Explain how mobile workers can connect
with their companies while in the
field.
Network Topologies
network topology
node
Explain the difference between network
topology and the actual wiring path of
a network.
What are the three common network
topologies?
Bus Topologies
bus topology
bus
transceiver
terminator
What do messages sent by the transceiver
contain?
Explain why problems occur if two or
more computers send messages at the
same time.
What serious problem may occur if there
is a broken connection along the bus?
What type of cables are used by bus
topologies?
Star Topologies
star topology (hub-and-
spoke topology)
In star topology, what is the function of
the hub?
What is the major disadvantage of star
topology?
Ring Topologies
ring topology
token
What is a potential drawback of ring
topologies?
Hybrid Topologies
hybrid topology
Why would businesses choose to use a
hybrid topology?
Physical vs. Logical Topologies
Explain the two levels of meaning for the
term typology.
Explain the difference between bus and
ring.
Network Hardware
What does setting up a computer network
generally require?
Hubs
hub
What is the major function of a hub?
Switches
switch
Why does a network switch render a
higher performance than a hub?
Repeaters
repeater (amplifier)
What major advantage does a repeater
offer?