Section 3.2

Question 1

What is meant by transport-layer demultiplexing?

Answer 1

Receiving a transport-layer segment from the network layer, extracting the payload (data) and delivering the data to the correct socket.

Question 2

What is meant by transport-layer multiplexing?

Answer 2

Taking data from one socket (one of possibly many sockets), encapsulating a data chuck with header information – thereby creating a transport layer segment – and eventually passing this segment to the network layer.

Question 3

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.

Answer 3

True

Question 4

True or False: When multiple TCP clients send TCP 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.

Answer 4

False

Question 5

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.

Answer 5

True

Question 6

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.

Answer 6

True

Question 7

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

Answer 7

True

Question 8

What is necessary when creating a UDP socket?

Answer 8

Destination IP address and destination port number

Question 9

What is necessary when creating a TCP socket?

Answer 9

Destination/source IP address and destination/source port number