3.2-1 Transport-layer demultiplexing. What is meant by transport-layer demultiplexing?

TCP applies fast retransmit to a segment when

3.1-2 Transport-layer functionality. True or False: The transport layer provides for host-to-host delivery service?

Over a TCP connection, suppose host A sends two segments to host B, host B sends an acknowledgement for each segment, the first acknowledgement is lost, but the second acknowledgement arrives before the timer for the first segment expires.

3.1-1 Location of transport-layer functionality. Where is transport-layer functionality primarily implemented?

3.2-5 Multiplexing UDP with identical port numbers. True or False:  It is possible for two UDP segments  to be sent from the same socket with source port 5723 at a server to two different clients.

Host A is sending host B a large file over a TCP connection. Assume host B has no data to send A. Host B will not send acknowledgements to host A because host B cannot piggyback the acknowledgements on data.

3.2-3 Multiplexing/Demultiplexing: UDP port numbers. True or False:  When multiple UDP clients send UDP segments to the same destination port number at a receiving host, those segments (from different senders) will always be directed to the same socket at the receiving host.

Consider an HTTP Web server using persistent connections. Suppose the server spawns a separate process for each client that connects to the server. Then each of these spawned processes will have different server port numbers.

3.2-6 Multiplexing TCP with identical port numbers. True or False:  It is possible for two TCP segments with source port 80 to be sent by the sending host to different clients.