Computing Essentials 2010
Answers to End-of-Chapter Materials
Chapter 9
Num
Multiple Choice
Answers
Matching
Answers
1
2
3
4
5
6
7
8
9
10
C
B
A
D
C
D
B
B
D
D
G
B
A
I
H
E
C
J
D
F
Open Ended Questions:
1. Define and discuss connectivity, the wireless revolution, and communications.
Connectivity is a concept related to using computer networks to link people and
resources. You can connect a microcomputer by telephone or other telecommunications
links to other computers and information sources almost anywhere. With this connection,
you are linked to the world of larger computers and the Internet. The single most
dramatic change in connectivity and communications in the past five years has been the
widespread use of mobile or wireless telephones. Communication systems are electronic
systems that transmit data from one location to another
2. Identify and describe the various physical and wireless communication channels.
Physical
Telephone lines - consist of twisted-pair cable made up of hundreds of copper
wires.
Coaxial cable- a high-frequency transmission cable with a single solid-copper
core.
Fiber-optic cable - transmits data as pulses of light through tiny tubes of glass.
Wireless
Infrared - uses infrared light waves to communicate over short distances.
Broadcast radio sends and receive radio signals through transceivers.
Microwave - uses high-frequency radio waves.
Satellite - uses satellites orbiting above the earth as microwave relay stations.
3. Identify the standard Internet protocol and discuss its essential features.
The standard protocol for the Internet is TCP/IP (transmission control protocol/Internet
protocol). Every computer on the Internet has a unique numeric address called an IP
address. Information is reformatted or broken down into small parts called packets.
4. Define and discuss the four principal network topologies.
Star network - a number of small computers or peripheral devices are linked to a central
Page 1 of 2
Computing Essentials 2010
unit.
Bus network - each device in the network handles its own communications control.
Ring network - each device is connected to two other devices, forming a ring.
Hierarchical network— consists of several computers linked to a central host computer,
and also hosts to other, smaller computers or to peripheral devices.
5. Define and discuss the three most common network strategies.
Terminal network system - processing power is centralized in one large computer,
usually a mainframe.
Client/server network systems - use one computer to coordinate and supply services to
other nodes on the network.
Page 2 of 2