Ability to share hardware and software resources
Individual workstation might survive network failure
Component and system evolution are possible
Support for heterogeneous forms of hardware and software
Access to other LANs and WANs
Complete the following exercises as directed by your instructor.
1. During the course of a normal day, keep a list of your
encoun- ters with computers of various kinds. Your list
the place and time of the encounter, the type of interaction
Types of errors and their prevention
CRC can detect nearly all errors
1. Do nothing
2. Return an error message to the transmitter
3. Fix the error with no further help from the transmitter
Figure 1.12 Computers help in nearly
all aspects of health care, from billing to
controlling machines for surgeons.
toward reducing the environmental impact in the
manufacture, use, and disposal of computers.
Like many products, the manufacture of
example, but its production facilities
may use computer-controlled robotics to manufacture products. Here
are just a few ways computers are
applied to industry:
Design. Nearly any company that
designs and makes products can
use a computer-aided design or
media centers, storing music, videos, and
mov- ies for on-demand playback on other
computers, consoles, and televisions throughout
Creativity. Poetry, music, painting, essays
on the state of the world, funny storiesthese
once required publisher
Figure 1.9 Supercomputers like Crays XT5 Jaguar are massive
machines, integrating hundreds of thousands of smaller processors
Some supercomputers link together hundreds of
thousands of processors. Supercomputers are ideal
for handling large and
that ready access to information has created some ethical gray areas along with learning
opportunities. For an example of one such gray area, see the Ethical Dilemma feature.
When you consider the importance of computers in our society, think about the im
everything from payroll management and
weapons control to games and simulations that
teach combat skills, the armed forces use the
widest array of computer hardware and software imaginable.
Police. When it comes to stocking their crimefighting arsenals,
Mainframe computers are
large, powerful systems used in
organi- zations such as
insurance com- panies and
banks, where many people
frequently need to use the same
In a traditional mainframe
A computer is an electronic device that
processes data, converting it into information
that is useful to people. The two basic types of
computers are analog and digital. The computers
commonly used today are all digital computers.
Computers designed for
Health Care Pay a visit to your family doctor or
the local hospital, and youll find yourself surrounded
by computerized equipment. Computers, in fact, are
making health care more efficient and accurate while
helping providers bring down costs.
File serving large storage disk drive acts as a central storage repository
Print serving Providing authorization to access a particular printer, accept and queue print
jobs, and user access to print queue to perform administrative duties
1. The two basic types of computer design are
a. PC and Mac
b. analog and digital
c. wired and wireless
2. Digital computers are so named because
a. they are made by a company called Digital
b. they process all their data and inst
Advantages of Local Area Networks
Ability to share hardware and software resources.
Individual workstation might survive network failure.
Component and system evolution are possible.
Support for heterogeneous forms of hardware and software.
Access to othe
Disadvantages of Local Area Networks
Equipment and support can be costly.
Level of maintenance continues to grow.
Some types of hardware may not interoperate.
Just because a LAN can support two different kinds of packages does not mean
A local area network is a communication network that interconnects a variety of data communicating
devices within a small geographic area and broadcasts data at
high data transfer rates
very low error rates.
(WANs now do this too)
Since the l
Functions of a Local Area Network
File server - A large storage disk drive that acts as a central storage repository.
Print server - Provides the authorization to access a particular printer, accept and queue print jobs, and
provides a user access to the
Local Area Network (LAN)
Metropolitan Area Network (MAN)
Serves users within a confined geographical area (usually within a mile).
Covers a geographic area the size of a city or suburb. The purpose of a MAN is often to
bypass local telephone companies wh
PCs are flat computers that have a touch-sensitive screen that can accept input from
a special pen or finger.
5. Though it may look like a desktop computer, a(n)
is a device that provides access to
a mainframe computer.
combines a cellular phon
Ask Andy Yother what the best part of his job is, and his answer comes quickly: I get to play with milliondollar toys, says this lead hardware and support engineer at Norcross, Georgia-based Canvas Systems, a
reseller of certified, pre-owned I
Is it okay to download and use software without paying for it?
Yesterday, you and your friend Tracy were looking at family photos on her computer. Tracy showed
you a hilarious picture of her little nephew that had been altered to make it look like he was
highly popular not only with business and technical
PDA users, but also with cell phone consumers. Not
every handheld PC user prefers to combine their
phone and handheld computer together, so sales of
devices both with and without phones are increasing. T
Figure 1.4 Notebook computers help
people get their work done no matter
where they are.
Figure 1.3 The screen,
keyboard, and system unit of a
desktop computer is a familiar
sight practically everywhere.
full-size desktop computer wherever
they go. Along w
Open-LTE: An Open LTE Simulator
For Mobile Video Streaming
Qinghua Zheng, Haipeng Du, Junke Li, Weizhan Zhang
Department of Computer Science and Technology
Xian Jiaotong University, China
A Business Model For Continuity
The Business Continuity Management Program
Components Of The Emergency Response Plan
Components Of The Disaster Recovery Plan
Components Of The Business Contingency Plan