1. Basic Concepts of a Computer Network

2. Content The Need for a Computer Network LANs and WANs
Peer-to-Peer
Server-Client
Connecting to a computer Network
network interface card (NIC)
Connecting Device … switch, hub, router
Network cables … coaxial cable, UTP, optical fibre
Wireless network
Network Topology … bus, star, ring
Network Operating System (NOS)

3. Common Services in a network
File Server
Print Server
Application Server ……

4. What is a computer network
A computer network is a system
of interconnected computers
that can exchange information and
share resources
resources
files / data / information / document
software
Hardware (device : harddisk drive, floppy disk drive, CD-ROM drive, printer, scanner)

5. Uses of network governmental departments corporation / business sector
educational institutions
private apartments
home
hotel
entertainment

6. Standalone computer Powerful, valuable tools for individual use
But during …. File transfer
by file copying, then give the disk to the other
Adv :
Allow us to socialize with a friend while we exchange and merge data
low cost, more secure, low technique required
Disadv :
far too slow
inefficient to meet the the need and expectation today
depends on distances we want the data to travel

7. When networked values increase greatly Adv : Disadv :
Reduce the need of paper communication
increase efficiency
nearly all type of data can be available simultaneously to every user
Disadv :
Less secure
much more technique required

8. The Need for a Computer Network
Advantage
Communication
Resources Sharing
Centralized Data Management
Software Sharing
Backup
Centralized Administration

9. Communication by using email winpopup (for Win 98) messaging
file transfer

10. Resources sharing share peripheral device share internet connection
printer
scanner
CD-ROM, other storage devices
Harddisk space
share internet connection
share CPU, RAM etc...

11. Centralized Data Management
users can work separately in different place
but sharing the same database file
no need to update PC by PC

12. Software sharing
some software has standalone version and also network version
using network version
lower the purchase cost
minimize the installation procedure
minimize problem caused by configuration changes

13. Backup network backup more secure more easy minimize down time
lower the cost for the backup storage
room security
equipment requirement etc...

14. Centralized Administration
in terms of user management
add user
edit user
delete user
inactivate user
in terms of security setting
full control
read only
write
execute

15. Networking Classification
By geographical limit / size
LANs / WANs
By computer relationship
server-client / peer-to-peer
By wiring layout / method
topology (bus / star / ring / mesh)