Transport Protocol.

1. Adam is buying a mobile Internet data subscription from an ISP called COMCEL while visiting Taiwan for one month. In the contract he has noticed that COMCEL only provide best-effort service. Imagine you are Adams knowledgeable tour guide, please explain to Adam why the ISP can only provide best-effort services not a guaranteed service.

2. List and briefly describe four broad classes of services that a transport protocol can provide for Internet applications. For each of the service classes, indicate if either User Datagram Protocol (UDP) or Transmission Control Protocol (TCP), or both of them provide such service.

3. Supposes the a server A has an IP address 11.22.33.44 with source port number 77. The client B has IP address 44.33.22.11 source port number 777.

1. TCP/IP host based diagram for UDP based connectionless of client B and server A interaction.
2. TCP/IP host based diagram for TCP based connection-oriented for client B and server A interaction.

4. Provide TWO generic connection diagrams separately for each of the initiation and termination process for TCP client and server. Provide a detail explanation by utilizing artificial sequence numbers and acknowledgement numbers and other relevant TCPs flags.