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CHAPTER 1:EXPLORE THE NETWORK (Topic 1.1), supports :, DISADVANTAGES OF…
CHAPTER 1:EXPLORE THE NETWORK (Topic 1.1)
1.1.2
Four Basic Requirements of a Reliable Networks
a. Fault Tolerance
The Internet needs to always work for its users, so it has to be designed to handle problems well.
A fault-tolerant network can keep working even if something goes wrong, affecting as few devices as possible.
If one way stops working, the messages can just go a different way.
This having lots of different ways to go is called redundancy.
b. Scalability
Every week, lots of new users and service providers join the Internet.
To handle this fast growth, the Internet needs to be scalable
A scalable network can quickly grow to support new users and applications without slowing down the service for existing users.
c. Quality of Service
Today, networks need to provide better quality of service. There are new applications like voice and live video on the internet.
There are new applications like voice and live video on the internet.
d. Security
Securing a network means protecting the devices that connect to it and stopping unauthorized access to their management software.
TOPIC 1.1.1: Computer Network Definition
“Chain of interconnected computers” –Oxford Dictionary
"A number of computers connected together for the purposes of communication of processing" -Knott, Waites and Callaghan, Comp. Studies
"A network is a set of devices (nodes) connected by media links" -Foruzan, Data Communications and Networking
Computer Network
A Network is a GROUP OF COMPUTERS and other devices (such as printers) that are connected by some type of TRANSMISSION MEDIA.
can be as small as two computer CONNECTED by a cable in a home office or as large as thousand computers connected across the world via a combination of cable, phone lines, and cellular links.
They might communicate through copper wires, fiber-optic cable, or radio waves as TRANSMISSION DATA.
Topic 1.1.3 : How host devices can be
used as clients, server, or both.
Divide to 13 category
Workstation
A Personal computer and most client are workstation computer - In other terms , workstation is a mobile computer
Server
Manage shared resources
Have more processing power, memory and hard disk space than clients.
Run network operating software such as :
data
user
group
security
application
Protocol
Format for communication between networked devices
Segment
Composed of a group
of nodes that use the same communications channel
Backbone
Segments and significant shared
devices
Such as routers, switches, and servers
Interconnecting smaller parts of a LAN or
WAN.
Host
Enables resource sharing by other computers
on the same network
Topology
Physical layout of a computer
network
needs of the organization and
available hardware and expertise.
Client
Requests resources or services
from another computer on a network
Network Interface Card (NIC)
A device in your computer
Connects a computer to the
network media
Allowing to communicate
Network Operating System (NOS
A software that run on a server and enable to
manage data
users
groups
security
applications
other networking functions
Node
Communicate over a
network and that is identified by a unique number also known as it's network address
Connectivity Devices
Specialized device
Allows multiple networks or multiple
parts of one network to connect and exchange data
SUBTOPIC 1.1.4
TYPES OF NETWORKS
COMMON
LOCAL AREA NETWORK (LAN) ; SAME BUILDING
WIDE AREA NETWORK (WAN) ; GEOGRAPHICAL DISTANCE
OTHER TYPES
METROPOLITAN AREA NETWORK (MAN)
WIRELESS LAN (WLAN)
STORAGE AREA NETWORK (SAN)
PERSONAL AREA NETWORK ( PAN )
INTERNET , INTRANETS , EXTRANETS
INTERNET
CONNECTED ANY PC TO OTHER PC IN THE WORLD THROUGH ROUTERS AND SERVERS
CAN SEND / RECEIVE
TEXT
GRAPHIC
VOICE
VIDEO
COMPUTER PROGRAMS
DIFFERENCE BETWEEN INTRANETS AN EXTRANETS
EXTRANET ( EXTROVERT )
CONTENT SHARED BY GROUPS TRHOUGH CROSS ENTERPRISE BOUNDARIES
INTRANET ( INTROVERT )
CONTENT SHARED BY MEMBERS WITHIN A SINGLE ORGANIZATION
supports :
Learn
communicate
work
play
DISADVANTAGES OF COMPUTER NETWORK
HOW NETWORKING TECHNOLOGIES ARE CHANGING THE HOME ENVIROMENT
NETWORK HARDWARE , SOFTWARE AND SETUP COSTS
HARDWARE AND SOFTWARE MANAGEMENT AND ADMINISTRATION COST S
UNDESIRABLE SHARING
ILLEGAL / UNDESIRABLE BEHAVIOUR
DATA SECURITY CONCERNS
Advantages of Computer Network
MUTIPLE USER SHARE RESOURCES
SAVE MONEY
SAVE TIME
MANAGES RESOURCES ON MUTIPLE COMPUTER FROM A CENTRAL LOCATION
NETWORK SIZES
SMALL HOME NETWORKS
SMALL OFFICE / HOME OFFICE NETWORKS
MEIUM TO LARGE TO WORLD WIDE NETWORKS
. Transmission Media
Which data are transmitted
and received
NO Boundaries