NETWORKING. FUNDAMENTALS. COMPLETE COURSE. Network • Security • Routing • Switching. 

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Network • Security • Routing • Switching

01. NETWORK FUNDAMENTALS. Network Definition. ➤. A network is a group of two or more connected devices. 

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A network is a group of two or more connected devices

Copper Cables, Fiber Optic Cables, Wireless Media

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02.'68.10
Firewall
IP: 192.168.40.254
Switch-3
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Router
IP: 192.168.40.1
Switch-I
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01. NETWORK FUNDAMENTALS. Network Definition. Enables sharing of resources, data, and services. 

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Enables sharing of resources, data, and services

Computer networks are designed to share resources, data, and services among multiple devices. This enables users to share hardware like printers and storage drives, saving equipment costs. It also allows seamless data sharing through centralized files and databases, alongside providing essential services like shared internet access and email communication within an organization. Would you like a translation into Arabic for this paragraph, or do you need a similar short paragraph about network media and crimping.

01. NETWORK FUNDAMENTALS. Network Definition. Classified by size: LAN, MAN, WAN. 

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WAN (Wide Area Network)A WAN spans across very large distances, such as countries or whole continents. It connects many smaller networks over long distances using satellites and undersea cables. The Internet is the largest and most famous example of a WAN.

LAN (Local Area Network)A LAN connects computers within a small area, like a home, school, or single office. It is very fast and easy to set up. People use it to share local resources like internet connections and printers.

MAN (Metropolitan Area Network)A MAN covers a larger area than a LAN, typically an entire city or a university campus. It connects multiple LANs together to form a bigger network. Banks often use a MAN to link all their branches inside one city.

Network Media Types. A practical guide to understanding how data travels — from copper cables to light pulses and radio waves.. 

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A practical guide to understanding how data travels — from copper cables to light pulses and radio waves.

What Are Network Media?. APB II-ILIII 6.•2E. Network media is the physical path through which data travels between devices. The right choice directly shapes your network's:. 

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Network media is the physical path through which data travels between devices. The right choice directly shapes your network's:

Network media belongs to the Physical Layer (Layer 1) of the OSI model — the foundation of all communication.

Five Main Types of Network Media. Ethernet. The trusted wired standard for homes, offices, and data centers.. 

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The trusted wired standard for homes, offices, and data centers.

Wireless freedom with modern speeds up to Wi-Fi 6.

Light-speed backbone of the global internet.

A solid middle-ground for medium-range connections.

Long-range wireless for cellular and IoT networks.

Ethernet: The Trusted Wired Standard. ⚡ Speed. Up to 10 Gbps and beyond with Cat6a and Cat7 cables.. 

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Up to 10 Gbps and beyond with Cat6a and Cat7 cables.

100 meters per segment (Cat6a) — ideal for buildings and campuses.

High — requires physical access to intercept data.

Low — widely available and easy to install.

Best for: Offices, homes, and data centers where reliability matters most.

Wi-Fi: Wireless Connectivity Freedom. Key Specs (Wi-Fi 6 / 802.11ax). 

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Speed: Up to 9.6 Gbps theoretical Range: ~100 m indoors (varies with obstacles) Security: WPA3 encryption Cost: Low to moderate

Challenges: Signal interference from walls, other devices, and radio congestion can reduce performance.

Fiber Optic: The Backbone of the Internet. 🚀 Speed. 

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Fiber Optic: The Backbone of the Internet

Terabits per second — the fastest available medium.

Hundreds of kilometers without signal boosters.

Very high — tapping fiber is extremely difficult to do undetected.

High installation cost, but low long-term maintenance.

Used in: Submarine cables, ISP backbones, and inter-city communication links.

Coaxial Cable & Radio Waves. Coaxial Cable. A copper core surrounded by insulation and a shield. Still widely used for cable TV and broadband internet.. 

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A copper core surrounded by insulation and a shield. Still widely used for cable TV and broadband internet.

Speed: Up to 1 Gbps Distance: Up to 500m Good noise resistance

Used in cellular networks (4G/5G), satellite links, and IoT devices. No physical cable needed.

Speed: Varies (Kbps to Gbps) Distance: Kilometers to global Highly flexible deployment

Quick Comparison: Speed & Distance. Medium Fiber Optic Ethernet (Cat6a) Wi-Fi 6 Coaxial Radio (56) o 200 4tm Max Speed (Gbps). 

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Medium
Fiber Optic
Ethernet (Cat6a)
Wi-Fi 6
Coaxial
Radio (56)
o
200
4tm
Max Speed (Gbps)

Fiber optic dominates in both speed and distance — it's the undisputed champion for long-haul, high-capacity links. Ethernet and Wi-Fi are closely matched in speed but serve different roles: wired reliability vs. wireless flexibility. Coaxial and Radio fill the gaps — cost-effective for medium-range and wide-area deployments.

Choosing the Right Medium. The best choice depends on your specific requirements. Most real-world networks use a mix of media types.. 

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The best choice depends on your specific requirements. Most real-world networks use a mix of media types.

Key Takeaways. 1. Media is the foundation. Every network's performance starts at Layer 1 — choose wisely.. 

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Every network's performance starts at Layer 1 — choose wisely.

Ethernet, Wi-Fi, fiber, coaxial, and radio each excel in different scenarios.

Real-world designs combine multiple media types for cost, speed, and flexibility.

Understanding media types is essential for designing and managing future networks.

Network Cable Crimping Guide. A step-by-step walkthrough for terminating Ethernet cables with RJ45 connectors — from tools to testing.. 

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A step-by-step walkthrough for terminating Ethernet cables with RJ45 connectors — from tools to testing.

Why Terminate Cables Yourself?. 💰 Cost Savings. Custom cables cost a fraction of pre-made ones, especially for unusual lengths.. 

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Custom cables cost a fraction of pre-made ones, especially for unusual lengths.

Create cables that fit your exact setup — no excess cable clutter.

Learn how networks physically work by building them yourself.

Proper tools and techniques prevent port and device damage from faulty connections.

Essential Tools You'll Need. Wire Stripper / Jacket Cutter. 

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Removes the outer sheath safely without nicking inner wires.

The plastic modular plugs fitted onto cable ends.

Secures the RJ45 connector firmly onto the wires.

Trim excess wire and verify all connections after assembly.

Optional: Wire boots protect exposed wire ends at the connector.

Wire Arrangement: The Key to Performance. Untwist Each Pair. 

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Separate all four twisted pairs carefully. Keep twists intact as close to the jacket as possible.

Flatten all eight wires and align them parallel in the correct color order (T568A or T568B).

Critical: Preserve wire twists up to the jacket edge to minimize crosstalk and EMI interference.

T568A vs T568B: Wiring Standards. T568A Standard 123 67 1: White/Green 2: Green 3: White/Orange 4: Blue 5: White/Blue 6: Orange 7: White/Brown 8: Brown Preferred for residential use. T568B Standard 1 23 1: White/Orange 2: Orange 3: White/Green 5: White/Blue 7: White/Brown 4: Blue 6: White/Breen 8: Brown Common in commercial networks and patch cables.. 

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T568A Standard
123
67
1: White/Green 2: Green
3: White/Orange 4:
Blue
5: White/Blue
6: Orange
7: White/Brown 8: Brown
Preferred for residential
use.
T568B Standard
1 23
1: White/Orange 2: Orange
3: White/Green
5: White/Blue
7: White/Brown
4: Blue
6: White/Breen
8: Brown
Common in commercial
networks and patch cables.

T568A is the preferred standard for residential and government installations. T568B is more widely used in commercial environments and patch cables.

Golden Rule: Use the same standard on both ends of a straight-through cable. Mixing standards creates a crossover cable.

Straight-Through Cable. When to Use It. Connects different types of devices:. 

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PC → Switch Router → Switch Wireless AP → Switch

Use the same standard on both ends — either T568A on both sides or T568B on both sides. This is the most common cable type in modern networks.

Crossover Cable. When to Use It. Connects same-type devices (older systems without Auto-MDI/MDI-X):. 

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Connects same-type devices (older systems without Auto-MDI/MDI-X):

Use T568A on one end and T568B on the other. This swaps the transmit and receive pairs.

Most modern devices support Auto-MDI/MDI-X, so a straight-through cable will often work even between identical devices.

2
3
4
5
6
7
8
Left end uses
T568B pinout
White/Orange
Orange
White/Green
Blue
White/Blue
Green
White/Brown
Brown
Right end uses
T568A pinout
2
3
4
5
6
7
8
White/Green
Green
White/Orange
Blue
White/Blue
Orange
White/Brown
Brown
pins 1-2 and 3-6 are crossed
to swap transmit and receive

CERÉ'DL S CEN LHUBH AMT BIILG 90 Rior TC6 14 q ncacR. 

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CERÉ'DL
S CEN
LHUBH
AMT
BIILG
90
Rior TC6
14
q ncacR

Insert each end of the cable into the main unit and remote unit of your Ethernet tester.

All eight indicator lights should illuminate in sequence. Any skipped or misordered light indicates a wiring fault.

If the test fails, cut off the faulty connector and repeat the process. Most failures are due to incorrect wire order or incomplete crimping.

✅ A passing test means your cable is ready for deployment. Well done!

Networking_Course

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