Physical Layer in OSI Model - GeeksforGeeks
14:20
Physical Layer in OSI Model - GeeksforGeeks
Mar 1, 2021
geeksforgeeks.org
Troubleshooting with the OSI Model (Network Engineer’s Secret Weapon) 🧠🌐 Most people guess when something breaks. Network engineers troubleshoot systematically — using the OSI model. Here’s how pros do it 👇 Layer 1 – Physical 🔌 Ask: Is it even connected? • Cables plugged in • Link lights on • Wi-Fi signal present Layer 2 – Data Link 🔄 Ask: Can devices talk locally? • Correct VLAN • Switch port up • ARP working • MAC address learned Layer 3 – Network 🌍 Ask: Can it reach other networks? • IP
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