computer networks sanjeewa hmc b.sc(hons(ruh)) reading mit(col) [email protected]
TRANSCRIPT
Objectives
• Brief introduction to computer networks & understanding sub netting to utilize ip address block in efficient manner.
Out lines
• 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!!!!!!!!!!!!!