where does the browser save the cache where does the os save the cache does router save the cache how many ips does the subnet of 255.255.255.0 how many of those can be used where does the nat gateway reside in private and public subnet your application crashed, what can you check (think system metrics like CPU) web server is not able to access the server, it can reach the same server in the same VPC, network wise everything looks okay. (think app logs) how to check historical CPU - HTOP how to check size of files in a linux directory what are inodes what is forward and reverse proxy server what is DHCP what happens when you type in browser www.amazon.com how to update auto scaling group? can it be done without downtime? (think update template template) how can you have dependencies installed on the 1000 instance (think AMI) OSI model describe any 2 layers of the OSI model which 2 layers are is amazon responsible for what is blue green deployment? compare with rolling/canary deployment how does rollback deployment happen in blue/green? how does rollback happen in canary deployment? customer wants suggestion on how many environments do they need cust env passes validations in test env but fails in prod cust env passes validations in all other env but fails in prod what is continuos integration and continuous delivery what is the difference between continuous delivery and continous deployment how do you set up ansible? how does ansible know which hosts to target