Meraki Network Support Engineer interview questions

Had applied online, got an email within a week, 1st round was scheduled, which was around 1/2 hour asked to explain DHCP, DNS, tcp vs udp also why cisco Meraki and what it does. 2nd round on webex, fully technical, pinging and troubleshooting, prepare vlans stp and layer 3, they want you to know all the basics thoroughly and deal with it. You won`t even know where you are going wrong, I missed completing the troubleshooting by 1 step and didn`t get selected. Maybe lacked technical expertise.