Q: What is the difference between a Layer 2 Switch and a Layer 3 Router?
- Layer 2 Switch: Operates at the Data Link layer. It moves packets strictly within the same local network. It forwards traffic based pur...
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🎙️ Candidate Opening & Architectural Context
""When an interviewer asks how I diagnose network connectivity, I follow an outside-in OSI model approach. The interviewer is testing: OSI Model, MAC vs IP.. I structure my answer around systematic triage first, root cause analysis second, and permanent remediation third.""
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🛠️ Production Runbook & Step-by-Step Resolution
1️⃣
Initial Diagnostics & Root Cause Analysis
- Layer 2 Switch: Operates at the Data Link layer. It moves packets strictly within the *same* local network. It forwards traffic based purely on physical MAC Addresses, utilizing an internal MAC address table to know which physical port a specific computer is plugged into.
- Layer 3 Router: Operates at the Network layer. It is responsible for bridging *different* networks together (e.g., connecting a home network to the internet). It routes traffic based on logical IP Addresses, using routing tables to determine the best path to send a packet across the globe.
2️⃣
Remediation & Permanent Safeguards
Execute the resolution runbook and verify workload health:
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: Layer 2 Switch: Operates at the Data Link layer. It moves packets strictly within the *same* local network. It forwards traffic ba."
⚡ 60-Second Elevator Pitch Talking Points
- Layer 2 Switch: Operates at the Data Link layer. It moves packets strictly within the *same* loca...
- Layer 3 Router: Operates at the Network layer. It is responsible for bridging *different* network...
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