Answer:
9KB
Explanation:
Assuming the maximum segment size is 1KB.
Thus, after the elapsed time following things will occur
1. There will commence of slow time.
2. There will be a beginning of window congestion at 1.
3. There will be a reset of threshold which is going to be 18KB/2=9KB.
Hence, If the next four transmissions are all successful, then we have
1st transmission: 1 segment, 1KB
2nd transmission: 2 segments, 2KB
3rd transmission: 4 segments, 4KB
4th transmission: 8 segments, 8KB
Following the four successful transmissions, the window size is expected to be 16.
However, since the threshold is 9KB, the window size will equal 9KB.
