You are working on a TCP connection between a client and a server, where the following parameters are set:

Receiver's Advertised Window Size: $10$ packets

Sender's Current Congestion Window $($CWND$)$: $8$ packets

RTT $($Round Trip Time$)$: $120$ ms

Packet Size: $1000$ bytes

During the transmission, the sender has sent packets numbered from $1$ to $15.$ The following events occur:

The sender has successfully sent packets $1$ to $8.$

The receiver processes and acknowledges packets $1$ to $8.$

Due to a temporary buffer constraint, the receiver sends an advertisement that its window size is now $6$ packets.

The sender attempts to send packets $9$ to $15.$

Questions:

Effective Window Size Calculation: Calculate the effective window size that the sender can use for transmission after receiving the advertised window size from the receiver.

Transmission Decision: Based on the effective window size, which packets will the sender actually send next?

Throughput Calculation: If the sender can transmit at a rate of $1$ Mbps $,$ calculate how long it will take to send the packets that are actually transmitted based on the effective window size.