" We are designing a new workspace with 3 floors.  On average, there will  be 100 devices on each floor that require wired and wireless  connectivity.  Submit a network design including:   (1.) A network diagram (2.) Hardware choices (3.) VLAN and subnetting  information (4.) Anything else you think is relevant. "    This was a question for a position at Shopify. While it was publicly available, I decided to wait and post this when the position closed. The Methodology/Framework Break it into chunks. Separate it by something, in this instance, the floors. Determine the departments. Subnets per floor - I'm not using CIDR. Pick the hardware. Ask other questions. 
I research and implement products + infrastructure for the Cloud, software, and other interesting things. My tailored Cloud Project Portfolio is at runtcpip.com