Information Technology, Chapter 2, Networks

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Nov 24, 2013 (3 years and 11 months ago)

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Information Technology, Chapter 2, Networks

Com
plete the following from p 49
-
53

Examples, types of networked information systems.

1

Local area networks


a.

Define a local area network.

A local area network connects computers and devises in a local geographical

area, e.g.
school, office. This enables users to share or access information and resources.

b.

What is a node?

A node is a network connection point, including desktop or mobile computer, peripheral
such as printer or scanner or portable device.

c.

How are the
nodes usually connected?

Often
,

nodes are connected to the LAN via cables. A wireless LAN uses on physical wires;
instead it uses wireless media such as radio waves.

d.

In a LAN who owns the infrastructure?

The
infrastructure is owned by the land owner.

e.

What

is the network operating system?

A n
etwork operating

system is the system software that organises, controls and
coordinates the activities on a local area network.

f.

List the tasks performed by a NOS.


A NOS controls the attached computer systems, ant peri
pherals and the communication
between them.

g.

List the 3 significant providers of NOS.

Administration
-

adding, deleting and organising users

and performing maintenance
tasks, such as backup.

File management
-

locating and transferring files.

Printer managemen
t
-

prioritising print jobs and reports sent to specific printers on the
networks.


Within a LAN two types of networks may operate:

Two types of networks that may operate within a LAN are peer
-
to
-
peer and a client server.


2

Peer
-
to
-
peer local networks

a.

Describe the nature of a peer
-
to
-
peer network

A
peer
-
to
-
peer network is a simple, inexpensive network that typically connects fewer
than ten computers. Each computer on a peer
-
to
-
peer network can share the hardware,
data or information located on any other

computer in the network.

b.

Where are these networks best suited?

Network
s best suited for very small businesses and home users.

c.

What are the disadvantages of these type of networks?

If a peer fails you can’t access that peer containing files, software, devi
ses. One fails they
all fail.


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3

Client
-
server networks

a.

Describe a client
-
server network.

In a client
-
server network a server, sometimes called

the host computer, controls access
to the hardware and software on the network and provides a centralised storag
e area
for programs, data and information.

b.

What is the major difference between the server computer and the client computer?

The major difference between the server computer and the client computer is

that the
server has more storage space and power.

c.

What
are the advantages of a client
-
server network?

The cost of adding clients that share the server’s resources becomes relatively less.

d.

What are the disadvantages of a client
-
server network?

That it cost more and requires ongoing technical support to maintain

the hardware and
software.


4

Wide area networks
, p 52


a.

Describe a wide area network, (WAN).

A wide area network covers a large geographical area.

b.

What is the largest WAN?

A
WAN can be one large network, or it can consist of
two

or more LANs connected
together
. The Internet is the worlds largest WAN

5

Internet peer
-
to
-
peer, (P2P)


a.

What is a P2P network?

Involves an Internet peer
-
to
-
peer network, which enables users with the same
networking software to connect to one another’s har
d disks and exchange files directly.

b.

What is required to connect to a P2P network?

To connect to a P2P network

the appropriate software
is needed
and
an
internet
connection.

c.

Why have Kazaa and LimeWire created controversy?

These programs have created contr
oversy with respect to the copyright infringement of
music because they allow users to copy MP3 music files easily from one computer to
another.

d.

What attempts have been made to reduce copyright infringement?

Music
-
sharing services typically are free
-
based,

and music files are often encrypted as
they travel across the Internet.

e.

What are some of the risks of using P2P networks?

Allowing internet peer
-
to
-
peer file sharing exposes your computer to possible security
violations.

f.

How does Kazaa now operate?

As a music subscription service.