CCNANetworkLab

Why Network Security is Needed
• Protect personal data
• Protect company data
• Prevent hacking and misuse
• Ensure safe internet usage

What is the OSI Model?

The OSI Model (Open Systems Interconnection Model) explains how data moves through a network.

It has 7 Layers:

1️⃣ Physical
2️⃣ Data Link
3️⃣ Network
4️⃣ Transport
5️⃣ Session
6️⃣ Presentation
7️⃣ Application

What is Wireless Networking?

Wireless networking allows devices to connect to a network without cables, using radio waves.

Example:
• Mobile phone on Wi-Fi
• Laptop in a classroom
• Smart TV at home

What is Wi-Fi?
• Wi-Fi is a wireless networking technology
• Based on IEEE 802.11 standards

You don’t need to go deep into standards now.

What is an IP Address?
An IP address is like a home address for devices on a network.
It helps devices find and communicate with each other.

📌 Example IP Address:
192.168.1.1

🔹 Without an IP address, devices cannot communicate on a network.
🔹 Every device must have a unique IP address.

👉 IP addressing is a core topic in CCNA.

📱 Need help or explanation? WhatsApp:
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Basic Networking Devices
Let’s understand the most common networking devices used in CCNA:

🔹 Router
Connects different networks and directs data traffic.

🔹 Switch
Connects devices (PCs, printers) within the same network.

🔹 Hub
A basic device that sends data to all connected devices.

🔹 Access Point
Provides wireless (Wi-Fi) access to the network.

👉 These devices are the foundation of networking.

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+93 744121143

Address Explained
An IP address is like your network home address.
Example: 192.168.1.1
Learn how to assign IP addresses in your labs.

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Vlan!

What is CCNA?

CCNA stands for Cisco Certified Network Associate.
It is a globally recognized certification for networking professionals.

With CCNA, you learn how to set up, configure, and troubleshoot networks. It covers:
• Routing & Switching
• Network Security
• IP Addressing & Subnets
• Network Protocols

This page will guide you step by step to understand and practice networking concepts.

Have questions or want help directly? Contact me on WhatsApp: +93 772 06 4330