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3.1.1 Basic Concept of Network 3.1.2 Network Architecture 3.1.3 Network…
3.1.1 Basic Concept of Network 3.1.2 Network Architecture 3.1.3 Network Topology
Network
a collection of computers and
devices connected together via
communication devices and transmission
media
Communication devices
any hardware that transmits data, instructions,
and information between a sending device
and a receiving device
Transmission media
the materials or
substances capable of carrying one or more
signals
Physical transmission media (wired)
use wire, cable,
and other tangible materials to send
communications signals
Examples:
–Twisted-pair cable
–Coaxial cable
–Fiber-optic cable
Wireless transmission media
send
communications signals through the air or
space using radio, micro wave, and infrared
signals
Examples of wireless signals:
– infrared
– radio waves
– microwaves
Advantages of Network
Facilitates
communications
Share
data and information
Share hardware and software
Transfer fund
Disadvantages of Network
Theft of personal information
Virus threat
Pornography
Social disconnect
Network Architecture
refers to the design of
computers, devices, and media on the
network
Peer-to-Peer (P2P)
each computer (called peer)
have equal capabilities and responsibilities to
share hardware, data or information
with other
computers on the
network
Each computer stores files on its own storage
devices
small network where high level
security is not necessary
Diagram
Advantages
• Easy and inexpensive to set up the network.
• More reliable because failure of one peer will
not affect other peers.
• All the peers can share their resources to
others
Disadvantages
• Lack of security control or other management
functions.
• Data recovery or backup is
very difficult. Each computer have to maintain
its own backup system
Client/Server
hich one or more computers act as
a server, and the
other computers, called client,
request services from the server
DIAGRAM
large
network which handle sensitive
and confidential data
Require a network
administrator to
manage the
network
Advantages
• Centralized control by the server promotes
better security and management of the
network.
• Data backup and recovery is easier since all
data is stored in the server
Disadvantages
• High cost to set
up and maintain
the network.
• Less reliable because too dependent on the
server; failure
of server will affect the
network.
• Network congestion may occur if too many
clients request services from server at the
same time
