Transcript Networking

Computer Networks
Sanjeewa HMC
B.Sc(Hons(Ruh))
Reading MIT(Col)
[email protected]
Objectives
• Brief introduction to computer networks &
understanding sub netting to utilize ip
address block in efficient manner.
Out lines
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What is a computer network?
Components of a network.
Advantages of a computer network.
IP Sub netting
• IP address
• Subnet mask
• Purposes of sub netting
• Example for sub netting
• References
What is a computer network?
• A computer network is a set of
interconnected network devices that allows
them to share data, information, software,
hardware devices and processing power.
Components of a network
• Server – to provide services
• Ex: file servers, web servers, data base
servers
• Client - to get services from those servers.
• Ex: web client
• Protocols - A protocol is an agreement (rules)
between the communicating parties on how
communication is proceed.
• Ex: TCP/IP suite
• Transmission media – to transfer data between
two network devices.
Transmission Media
• Guided Media
• Unguided Media
Guided media
• Physically connect two devices using
wired connection.
• Ex:
• Twisted Pair (UTP,STP)
• Coaxial cable
• Optical fiber
Unguided Media
• Physically not connected using wired
connection. use wireless technology to
communicate with each other.
• Ex:
• wi-fi
• Infra red
Advantages of computer netwoks
• Provides a way to share data, programs,
computing power and information.
• Online credit card checking, e-commerce
and Electronic fund transfer are possible.
• Easily administered.
• Provides an efficient means of
communication such as e-mail, voice mail,
and video conferencing.
• Provides data security.
IP sub netting
• IP address
• Is a unique address (number) to identify
each network devices.
• Is 32 bit binary number with 4 octal
• Ex:192.168.2.4
• There is two parts in an ip address
• Network part
• Host part
IP sub netting cont…….
• IP Classes
• Class A
• 1.0.0.1 – 126.255.255.254
• Class B
• 128.0.0.1 -191.255.255.254
• Class C
• 192.0.1.1-223.255.255.254
IP sub netting cont…….
• Sub net mask
• We can get subnet mark for a ip
number by each network bit value set to
1.
• It helps to identify whether the network
is sub netted or not.
• Ex: subnet mask for a class C ip is
255.255.255.0
• Purposes of sub netting.
• Eliminate ip wast
• Fine tune network by utilizing ip in
efficient manner.
IP sub netting cont…….
• Ex:
• You have an ip ranage 192.168.1.0/24.
there is two labs to network with 50 and 25
terminals.
References.
• Tanebaum, Andrew S.,2003,Computer
networks - 2003 -Pearson Education ;
Delhi - xx,891 p. : 4th ed. (modified on
19/04/2010)
• Meijer,Anton,1982,Computer network
architectures -Computer Science Press ;
Maryland - xi,396 p. (modified on
19/04/2010)
Thank you!!!!!!!!!!!!!