csc339 – lecture 2 network fundamental
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05/02/2023Jahan University 1
CSC339 – NETWORK
FUNDAMENTAL Jahan University
Computer Science Department
Lecturer: Islahuddin Jalal
Master in Cyber Security
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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.
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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%
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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
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Network Media
Wired Media Twisted Pair Coaxial Fiber Optic
Wireless Media RF (Radio Frequency) Infra red rays
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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
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Types of cable for Wired Network media Three primary types of cables for wired media
Twisted Pair Coaxial Fiber Optic
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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).
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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.
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Continue….
RJ-11
RJ-45
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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.
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UTP vs STP
UTP: Unshielded Twisted Pair Susceptible to EMI
STP: Shielded Twisted Pair Protects against EMI Uses an RJ-45 Connector
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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.
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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
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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
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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
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Crossover Cable
Used for same devices connectivity PC to PC Switch to Switch Router to router Etc.
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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
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Rolled Over Cable
Used for router configuration
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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.
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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…………………….
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