d. TCP segment contains a sequence number and an acknowledgment number.
35. Proprietary applications use which kind of port?
a. Dynamically assigned ports
b. Well-known ports
c. Registered ports
36. Ports that are used only for the duration of a speci?¬?c session are called _____.
a. dynamically assigned ports
b. well-known ports
c. registered ports
37. The source port in both a UDP header and a TCP header is a _____.
a. 16-bit number of the called port
b. 16-bit length of the header
c. 16-bit sum of the header and data ?¬?elds
d. 16-bit number of the calling port
Review Questions 135
38. Which ?¬?eld in a TCP header ensures that data arrives in correct order?
a. Acknowledgment number
b. Sequence number
c. Reserved
d. Options
39. In a TCP connection setup, the initiating device sends which message?
a. ACK
b. Receive SYN
c. Send SYN
40. Acknowledgment and windowing are two forms of _____.
a. ?¬‚ow control
b. TCP connection
c. TCP sequencing
d. reliable connections
41. Windowing provides which of the following services?
a. The sender can multiplex.
b. The receiver can have outstanding acknowledgments.
c. The receiver can multiplex.
d. The sender can transmit a speci?¬?ed number of unacknowledged segments.
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