When a timeout occurs, three things happend. First, slow start will be initiated. Second, the congestion window would start at 1. Third, the threshold will be reset to 28KB/2=14KB. If the next four transmission are all successful, then
- 1st transmission: 1 segment, 2KB
- 2nd transmission: 2 segments, 4KB
- 3rd transmission: 4 segments, 8KB
- 4th transmission: 8 segments, 16KB
- 5th transmission: 16 segments, 32KB
- 6th transmission: 32 segments, 64KB
After these six successful transmissions, the window size is supposed to be 64. However, since the threshold is 14KB, the window size can only be 14 KB.