L1, L2, L3 Layer Protocols — The Foundation of Networking Explained Simply Ever wondered how data travels from one device to another — flawlessly, every second? That’s where the magic of Layer 1, Layer 2, and Layer 3 protocols comes in. 📡 Layer 1 (Physical Layer) – Deals with cables, signals, and hardware. ➡️ Protocols: Ethernet, DSL, SONET, USB 🔗 Layer 2 (Data Link Layer) – Ensures data is error-free and properly framed for delivery. ➡️ Protocols: ARP, PPP, Frame Relay, VLAN, STP 🌍 Layer 3 (
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𝐋𝟐 𝐒𝐰𝐢𝐭𝐜𝐡 𝐯𝐬 𝐋𝟑 𝐒𝐰𝐢𝐭𝐜𝐡 | 𝐒𝐰𝐢𝐭𝐜𝐡𝐢𝐧𝐠 𝐂𝐨𝐧𝐜𝐞𝐩𝐭 | 𝐂𝐂𝐍𝐀 Not all switches work the same way ⚙️ Understanding the difference between Layer 2 and Layer 3 switches is a must for CCNA and real-world networks. Let’s break it down clearly 👇 🔹 𝐋𝐚𝐲𝐞𝐫 𝟐 (𝐋𝟐) 𝐒𝐰𝐢𝐭𝐜𝐡 Works at OSI Layer 2 (Data Link Layer) Uses MAC addresses for forwarding Used to connect devices within the same network 📌 Functions: • MAC address learning • Frame forwarding • VLAN creation • S
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