Question

At time t, a tcp connection has a congestion window of 4000 bytes. The maximum segment size used by the connection is 1000 bytes. The congestion window after it sends out 4 packets and receives acks for all of them in slow start phase and congestion avoidance phase are p and q bytes respectively. The value of p-q in bytes is?

Answer 1

At time t, a TCP connection has a congestion window of 4000 bytes. The maximum segment size used by

the connection is 1000 bytes. What is the congestion window after it sends out 4 packets and receives acks

for all of them? Suppose there is one ack per packet.

(a) If the connection is in slow-start?

Solution: 8000 bytes. In slow start, the sender increases its window for each byte successfully

received.

(b) If the connection is in congestion avoidance (linear mode)?

Solution: 5000 bytes. The sender increases its window by one segment each window.