csc339 – lecture 1 network fundamental

05/01/2023Jahan University 1

CSC339 – NETWORK

FUNDAMENTAL Jahan University

Computer Science Department

Lecturer: Islahuddin Jalal

Master in Cyber Security


Class Policy

A student must reach the class-room in time. Late comers may join the class but are not entitled to be marked present.

Attendance shall be marked at the start of the class and students failing to secure 75% attendance will not be allowed to sit in final exam.

The assignment submission deadline must be observed. In case of late submission, ten percent may be deducted from each day.

Those who are absent on the announcement date of the assignment/test. Must get the topic/chapter of test/assignment confirmed through their peers.

Mobile phones must be switched-off in the class-rooms.


Grading Evaluation for Network fundamental

Internal Evaluation Midterm Exam 20% Attendance 5% Assignment/Presentations 5% Quizzes/Tests 10% Total Internal Evaluation 40% Final-term Examination Final-term Exam 60% Total Marks 100%


Topics to be discussed

What is network? Advantages of Network Types of network Network Architecture Wiring Schema (Topology of Network)


What is Network?

A collection of computing devices that are connected in various ways in order to communicate and share resourcesUsually, the connections between computers in a network are made using physical wires or cables

However, some connections are wireless, using radio waves or infrared signals

The generic term node or host refers to any device on a network Data transfer rate The speed with which data is moved from one

place on a network to another Data transfer rate is a key issue in computer networks


What is Network?


Advantage of Computer Networks

Sharing of devices such as printer and scanner Sharing of program /software Sharing of files Sharing of data Sharing of information Sharing of single high-speed internet connection Provide facility to access server centered database


Types of Network There are different types of Networks

LAN CAN MAN WAN


Types of Network LAN A network that connects a relatively small

number of machines in a relatively close geographical area


Types of Network

CAN – Campus Area Network A network spread between multiple contiguous buildings.


Types of Network

MAN A network spread between multiple non-contiguous buildings within the single metropolitan area.


Types of Network

WAN A network that connects two or more local-area networks over a potentially large geographic distance


Network Architecture

Overall design of a computer network that describes how a computer network is configured and what strategies are being used

It is mainly focuses on the function of the networks. It is also known as network model or network design Types of network architecture:

Client /Server Network Peer to Peer Network


Types of Network Architecture

Client/Server In a client/Server network each hosts will act specifically as a server (the

provider of resources) or a client (the receiver of resources).


Types of Network Architecture

Peer-to-Peer In Peer-to-Peer network every host will act as a client and a server.


The Differences between Client / Server and Peer-to-Peer


Network Topologies (wiring Schema)

Network Topology: Physical layout of a network is called network topology.

There are different types of network topologies Star Topology Bus Topology Ring Topology Mesh Topology Hybrid topology


Star Topology

All the computers are connected through a central connection point (hub, switch etc)

A single break in the cable would only take down communication to one computer

As hub failure would take down the entire network


Bus Topology

All the computers are connected in straight line Terminators must be used at each end of a bus segment to prevent

signals from bouncing A single break in the cable would take down the entire network


Ring Topology

All the computers are connected in circular fashion Data is passed around the ring from computers to computer A break in the cable would take down the entire network


Mesh Topology

All the computers are connected to all other computers Typically used in a WAN environment Provides fault tolerance in the event of a connection failure


Hybrid Topology

Different types of topologies can be used together to form a hybrid topology.


Questions Regarding Topologies

Which kinds of network topologies connect all devices to a central device?

What kind of network topology is this?

What kind of network topologies is used in 802.11 wireless network?


Basic Network

Hub

Pamir Khkula

How would you say the PC named Pamir communicates with the PC named Khkula?

“Hey Khkula, I love you”

or“Hey 192.168.0.3, I love you” Which one is right?Both are wrong But

why?


Basic Networking

Because Pamir is actually going to use Khkula’s MAC address But what would happen if pamir only knows her name and doesn’t

know her IP address and Mac Address? Pamir query

Khkula Response

This Problem is solved by ARP

Source Destination protocol Info192.168.0.2 Broadcast ARP Who has 192.168.0.3? Tell

192.168.0.2Source Destination protocol Info

192.168.0.3 192.168.0.2 ARP 192.168.0.3 is at 00:0b:db:99:d3:5e

192.168.0.3 192.168.0.2 NBNS Name query response NB 192.168.0.3


Questions

What would happen if the network grows and grows and become a large network?

What would be the solution?

What is the Process to split a larger network into a smaller Networks?

Which devices are needed for network Segmentation?

The Network speed become low

To split the network into a smaller Network

Network Segmentation

Routers, Switches and Bridges

END

Thanks for hearing…………………….

csc339 – lecture 1 network fundamental

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