Your question is Explain L2 vs L3 Networking. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Tell me about the difference between L2 and L3 networking.
Explain the addressing, data units, devices, and forwarding decisions associated with each layer. Include one practical example of how a QA Automation Engineer could verify an L2 or L3 connectivity problem, and explain where VLANs, subnets, MAC addresses, IP addresses, ARP, and routing fit.
Keep the answer focused on Ethernet and IPv4 networking, with Cisco IOS XE terminology where relevant.