A TCP window holds bytes from $501$ to $2000.$ The next byte to be sent is $1011.$

Describe the window for the current situation by Sf$,$ Sn$,$ and window size parameters.

Describe the window by Sf$,$ Sn$,$ and window size parameters after an ACK segment with the acknowledgement number $700$ and windows size advertisement of $2000$ is received.

Describe the window by Sf$,$ Sn$,$ and window size parameters after a segment carrying $600$ bytes is sent.

Assume all events $1,2,$ and $3$ happen in numerical order.