Network Introduction

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31 Οκτ 2013 (πριν από 4 χρόνια και 7 μέρες)

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Technology

ICT


Communications & Computer Networks


Resource Notes
-

Introduction

Introduction

Local area networks (LAN’s) are computers connected together
for the purpose of sharing.


This sharing can include:




Files and folders


Printers


Scanners


Internet connection etc.

Introduction

There are two main Types of LAN:




1. Workgroup
:




All the computers are of equal status (peers)


There is no controlling computer


Share level
access is used


Works well for small LAN’s

Introduction

2.
Domain
:





A
Server
is used to control access to the network


It also controls the
sharing

of resources


User Account
is needed to access the network


Resources are shared with
named users
or

groups


Permissions
are

set to control the amount of access






Introduction

3.

Servers




Many server types


Individual servers can be used


One server can perform many functions



Domain Controller


File server


Application server


Mail server


Print server



Proxy server





Introduction


Domain Controller



A server holding a copy of the
Active Directory

Active Directory
-

database
holding information about
users
,
groups
,
computers
and
network resources
in the domain



File Server




Provides a
location for shared folders
and
files

Domain Controller usually carries out the functions of the file server



Application Server


Set up to
run specific applications

Could be one application or a number of applications

E.g.:

large database
-

many users, a
separate server
may be
required to take the load of the domain controller

Application server runs database
-

DC

runs active directory

Introduction


Mail Server
:




Large networks
-

email

throughput

very large
large

Separate server
needed to handle the task.

Usually, a mail server is a
software application
run on a domain
controller, a file server or an application server




Print Server
:




A server
-

controls the
printers
on the network

Modern printers can have
print server functions
built in

Printer can be
connected to the network directly



Proxy Server:




Acts as am
intermediary
between the
clients
and the
Internet

K
eeps the
client computers anonymous
for
security
reasons

Caches web pages
to
speed up Internet access
for the clients

Filters Internet content