Networkx - CovertGameVirus

orangesvetΗλεκτρονική - Συσκευές

8 Νοε 2013 (πριν από 3 χρόνια και 10 μήνες)

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Part 1
: The definitions
o
f networking


-
Net work


-
St andal one


-
LAN



-
WAN


-
Cl i ents


-
Ser ver


-
Cl i ents/Ser ver Net works


-
Peer to Peer Net works


Part 2
: LAN (going in depth)


-
Advant ages and di sadvantages of LAN


-
The t ypes of cabl ed LAN


-
The most essent i al pi ece of har dware for
l an
… The Et her net cabl e


-
The di f ference bet ween Et her net and cross
-
over cabl es


-
LAN Topol ogi es


Part
3
: Continuation…



-
Advant ages of some topol ogi es


-
Wi rel ess LAN ( WLAN)


-
WAN


-
Dat a t r ansmi ssi on



CONTENTS

NETWORK

A network

is a
collection
of

hardware

components and computers
connected
by communication channels that allow
sharing of resources and information.

STANDALONE

A computer software that can work offline and does
not need a computer connection.

An example of a standalone device can be a
TomTom

(GPS)

LAN

Local area network usually known as LAN,

is
a

computer network

that
connects
computers in a
limited area such as a home, school, computer
laboratory
or office building using network media

WAN

A

Wide Area Network

(WAN) is a telecommunication network that
covers a broad
area.
Business and government entities utilize WANs
to relay data among employees, clients, buyers, and suppliers from
various geographical locations. In essence this mode of
telecommunication allows a business to effectively carry out its daily
function regardless of
location.

CLIENTS

A

client

is an

application

or system that accesses a service made
available by a

server. The server is often (but not always) on
another

computer system, in which case the client accesses the service
by way of a

network
.

The term was first applied to

devices

that were not
capable of running their own stand
-
alone

programs, but could interact
with remote computers via a network. These

dumb terminals

were
clients of the

time
-
sharing

mainframe computer.

SERVER

In the context of

client
-
server architecture, a

server

is a computer
program running to serve the requests of other programs, the
clients.
Thus, the "server" performs some computational task on
behalf of "clients". The clients either run on the same computer or
connect through the network.

CLIENT/SERVER NETWORKS

A computer network in which one centralized,
powerful computer (called the

server) is a hub to which
many less powerful personal computers or
workstations (called

clients) are connected. The clients
run programs and access data that are stored on the
server.

PEER TO PEER NETWORKING

Peer
-
to
-
peer

also known as P2P, it refers
to a computer
network in which each computer in the network can act
as a client or server for the other computers in the
network, I
t allows the sharing of files with a main or client
server.
P2P networks can be set up
Fo

a home business
and the internet.

Advantages

Disadvantages

-
Workstations can share peripheral devices
like printers. This is cheaper than buying a
printer for every workstations.

-

Networks are difficult to set up and need to
be maintained by skilled technicians.

-

Workstations do not necessarily need their
own hard disk or CD
-
ROM drives, which
makes them cheaper to buy than stand
-
alone
PCs.

-

If server develops a fault, users may not be
able to run the application programs.

-

Users can communicate with each other and
transfer data between workstations very
easily.

-

A fault in the network can cause user to lose
the data.

-

One copy of each application package such
as a word processor,
spreadsheet

etc. can be
loaded onto the file and shared by all user.

-
If the network stops operating then it may not
be possible to access various computers

ADVANTAGES AND DISADVANTAGES

OF LAN

The 3 types of LAN Cables are Coaxial
cable, Optical fibre cable and twisted pair,
where as Optical fibre is
is

the fastest by
using the reflection of light to transfer
data.

THE 3 TYPES OF CABLED LAN

OOOOO!

SHINY!

The most essential thing for LAN is the Ethernet cable.
This cable connects all of the clients together without
this piece of hardware LAN is useless.

There are different LAN cables such as; Cat3, Cat5,
Cat5e, Cat6, Cat7 and the crossover cable.

The Cat series of cables are just different versions of the
default Ethernet cable each one is faster in its ways.

The cross over cable allows two clients to connect
directly without interference, this cable cannot be used
in replacement for a normal Ethernet cable. In a cross
over cable the wires are switched around on each end.

THE MOST ESSENTIAL PIECE OF
HARDWARE FOR
LAN
… THE
ETHERNET CABLE

THE DIFFERENCE BETWEEN
ETHERNET AND CROSS
-
OVER CABLE

Cross
-
over Cable


Ethernet Cable

LAN has different Topologies like

-
Bus(Logical Ethernet)

-
Hub and Spoke (Star)

-
Hybrid (Bus and Star)

-
Point to Point (Serial)

-
Point to multipoint (Frame Relay)

-
Ring (FDDI, Token ring)

Those are the different types of LAN topologies all following a
different method.

LAN TOPOLOGIES

Two advantages for Bus topol ogi es are

-
It
i s easy to handl e and i mpl ement.


-
It
i s best sui ted for smal l networks
.


Some advantages and di sadvantages of star topol ogi es are

Advantages

Due to i ts central i zed nature, the topol ogy of fers si mpl i ci ty of operati on.


It al so achi eves an i sol ati on of each devi ce i n the network.


Di sadvantage

The network operati on depends on the functi oni ng of the central hub. Hence,
the fai l ure of the central hub l eads to the fai l ure of the enti re network.


ADVANTAGES OF SOME TOPOLOGIES

Links two or more devices to a wirelessly
transmitted HUB where the devices will
connect to the internet through the HUB.

WIRELESS
LAN

(WLAN)

WAN is mostly used in Businesses
allows The relaying of Data among the
clients, buyers and employees. This
mode of telecommunication allows for a
wide broad of efficiency to be carried
out.

WAN

Data
transmission

is the physical transfer
of

data

(a

digital

bit
stream) over a point
-
to
-
point or

point
-
to
-
multipoint
communication

channel. Examples of such
channels are

copper wires,

optical
fibres,

wireless

communication channels,
and

storage media. The data are represented
as an

electromagnetic

signal, such as
an

electrical voltage
,

radio wave,

microwave,
or

infrared

signal.

DATA TRANSMISSION