Solution

The correct answer is Statement I is true but Statement II is false 

Key Points

• Statement I: If a client is waiting to receive a packet, it may indeed wait indefinitely.
  • This is because, without using a TCP keepalive timer, the client can't detect that the server has crashed and rebooted. It has no mechanism to determine the server's state so it waits for a packet that will never arrive. So, it is true statement.
• Statement II: If the client sends a packet after the server reboot, it will not receive a FIN segment.
  • In normal operation, a FIN (Finish) segment is sent by a host to indicate that it has no more data to send. However, in this circumstance, since the server has crashed and rebooted, it likely wouldn't remember the previous connection and hence wouldn't send a FIN segment in response to a packet for that connection. Instead, the client would likely receive a RST (reset) segment, indicating that the connection does not exist on the server's side. So, it is false statement.