Design a sliding window protocol that allows transmission of upto eight packets before an acknowledgement arrives. to ensure thereceiver understands packets that arrive out of order, slidingwindow protocols include a counter in the header. what size counteris needed? why?

only #2 represents an object at rest on a table.

in #1, there is no normal force due to the table; the object is accelerating downward.

in #3, the vertical forces are not balanced; the object is accelerating downward.

in #4, neither the vertical nor the horizontal forces are balanced. the object is accelerating upwards and to the right.