Csc339 – lecture 2 network fundamental

05/02/2023Jahan 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 media? Network cabling for wired media Types of cable for Wired Network media Cabling of twisted pair cable


Network Media

Wired Media Twisted Pair Coaxial Fiber Optic

Wireless Media RF (Radio Frequency) Infra red rays


Network Cabling for wired media

Cabling is the transmission medium for data Variety of cable types are used Each cable types has its own advantages and disadvantages


Types of cable for Wired Network media Three primary types of cables for wired media

Twisted Pair Coaxial Fiber Optic


Wired Media - Twisted Pair

Gets its name by having four pairs of wires that are twisted to help reduce crosstalk or interference from outside electrical devices. Crosstalk is interference from adjacent wires.

There are two forms of twisted-pair cabling Unshielded twisted-pair (UTP) Shielded twisted-pair (STP).


UTP Unshielded twisted-pair (UTP) cables are familiar to you if you

have worked with telephone cable. The maximum distance of UTP is 100 meters. UTP cable uses small plastic connectors designated as registered

jack 45 It can be easy to confuse the RJ-45 connector with the RJ-11

connector. The RJ-11 connector is a telephone connector

Twisted-pair cable is more susceptible to interference than coaxial, however, and should not be used in environments containing large electrical devices.


Continue….

RJ-11

RJ-45


Categories of UTP

Each category of UTP cabling was designed for a specific type of communication or transfer rate.

CAT 3: 10 Mbps CAT 5: 100 Mbps CAT 5e: 1000 Mbps CAT 6: 1000 Mbps CAT 6e: 10000 Mbps All categories can travel up to 100 meters before suffering from

attenuation.


UTP vs STP

UTP: Unshielded Twisted Pair Susceptible to EMI

STP: Shielded Twisted Pair Protects against EMI Uses an RJ-45 Connector


STP Shielded twisted-pair (STP) cable is very similar to

UTP cabling, but it differs from UTP in that it uses a layer of insulation within the protective jacket, which helps maintain the quality of the signal.


Cabling of Twisted Pair Cable

Cabling/cable are used for computer connectivity or computer network

We have three important types of Cabling Straight-through cable Crossover Cable Rolled Over Cable


Straight-through Cable

Used for different devices PC to Switch PC to Hub PC to DSL(Digital Subscriber Line) PC to Router Switch to Router Etc


Configuration of Straight through cable Side A: white orange, orange, white green, Blue, White blue, Green,

white brown, Brown

Side B: white orange, orange, white green, Blue, White blue, Green, white brown, Brown


Crossover Cable

Used for same devices connectivity PC to PC Switch to Switch Router to router Etc.


Configuration for Cross over Cable

Side A: white orange, orange, white green, Blue, White blue, Green, white brown, Brown

Side B: white green, Green, white organge, Blue, White blue, orange, white brown, Brown


Rolled Over Cable

Used for router configuration


Configuration for Roll over Cable

Side A: white orange, orange, white green, Blue, White blue, Green, white brown, Brown

Side B: Brown, white brown, Green, white blue, Blue, white green, orange, white orange

Wired Media – Coaxial

Coaxial cable is made up of 4 layers: Copper Core Inner Insulator Shielding Wire Mesh Outer Insulator

Thinnet (RG-58/Cheaper Net/10Base2) 10 Mbps 185 Meters Uses a BNC Connector Has been primarily replaced by twisted pair.

Thicknet (RG -8) 10 Mbps 500 Meters Uses AUI connector

RG-59 & RJ-6 Typically used for cable TV.


Thinnet vs Thicknet

Coax Type Cable Grade Thickness Maximum Distance

Transfer Rate

Connector Used to Connect NIC to Cable Type

Thinnet RG-58 0.25 in 185 m 10 Mbps BNC (British Naval Connector)

Thicknet RG-8 0.5 in 500 m 10 Mbps AUI (Adapter Unit Interface)

BNC Barrel Connectors

BNC T Connectors

BNC Terminator BNC Port

NIC

10Base2 – using BNC T connector and RJ58-AU coaxial cable

DIX connector

DIX connector NICDIX connectors 10Base5 – Male DIX

connector and RJ11 cable

Wired Media – Fiber Optic

Fiber optic cable uses light pulses instead of electricity to transmit data.

Benefits More Secure Not Susceptible to EMI Very Fast Long Distances

Drawbacks More Expensive Not as Flexible

Uses SC, ST, and LC Connectors

Common Connectors

END

Thanks for hearing…………………….

Csc339 – lecture 2 network fundamental

Technology

Transcript of Csc339 – lecture 2 network fundamental