Answers:

• No, both operations depend on external factors. You need to wait before they are fnished.
   

• No, in a server application you don’t have to use async/await. It’s only for responsiveness on the client.

• Yes, this will free your thread to serve other requests while waiting for the I/O to
  complete.

• Yes, this put your thread to sleep while waiting for I/O so that it doesn’t use any
  CPU