Consider the following file transport application, which uses the protocol defined below to reliably service a client’s request.
The protocol has the following characteristics:
• The protocol runs across a network with a 1050 byte MTU, a 20 ms one-way latency.
• Each transferred packet consists of a total of 50 bytes of packet headers plus the payload.
• The client initiates a three-way handshake, piggybacking a 100 byte request on the third packet of the handshake.
• The server has a maximum transmission window of three MTU (3000 Bytes).
• The client sends one cumulative acknowledgment after every two data packets arrive.
• After the last packet in the file has been acknowledged, the server sends a FIN, which the client must acknowledge before closing the connection.
Suppose that packet 3 is lost on its way to the client but all other packets get through. Which packet arrival subsequent to packet 3 triggers an acknowledgment and what would the client acknowledge when that packet arrives?
If “packet 3” is not 3rd packet of handshaking but file data (sure, otherwise server won’t send FIN):
1.Which packet arrival subsequent to packet 3 triggers an acknowledgment – FIN-ACK sent by server 2. what would the client acknowledge when that packet arrives – (if “that packet” is “packet 3” then FIN-ACK, otherwise FIN).