Consider the following scenario, in which a Web browser $($lower$)$ connects to a web server $($above$).$ There is no web cache in this question $($so make sure you understand the difference between a browser cache and a web cache$).$ Assume that the total Round Trip Time $($RTT$)$ propagation and queueing delay between the browser and web server is $200$ msec. Suppose that the browser makes an HTTP request to the server for an HTTP object, that the browser has a copy of that object in its cache, but that copy may or may not be up to date in its cache $($and so the browser requests the object using the HTTP If$-$Modified$-$Since header field$).$ Assume that the time taken to transmit an HTTP reply $($by the sender into the TCP connection$)$ that contains a requested object in the body of an HTTP reply is $50$ msec, but that the time taken to transmit a HTTP reply with a $"304$ Not Modified" reply code without an included object is negligible $($e$.$g$.,$ zero$).$ You can assume that a TCP connection has already been set up$,$ so do not include that delay in your answer below.

Q$3.$ What is the time from when the browser issues the initial HTTP GET request until it can display the requested object in the case that the browser does not have the requested object in its browser cache?

Q$4.$ What is the time from when the browser issues the initial HTTP GET request until it can display the requested object in the case that the browser does have the requested object in its browser cache?