Name : ____________________________________ID_____________________ Exercise 1 1. The _______ layer establishes, maintains, and synchronizes the interaction between communicating systems. a. network b. transport c. session d. presentation 2. A digital signal has a bit rate of 50 Kbps. The bit interval is _______ microseconds. a. 200 b. 20 c. 2 d. 0.2 3. The _______ of a signal is usually expressed in seconds. a. amplitude b. frequency c. period d. phase 4._______ signal repeats a pattern over and over again. a. A digital b. An analog c. A periodic d. An aperiodic 5. A simple sine wave completes one cycle in one microsecond. Its frequency is _______. a. 1 MHz b. 1 GHz c. 1 Hz d. 1 THz 6. If the maximum value of a simple sine wave is 10 volts, the minimum value is _______ volts. a. 10 b. 5 c. the square root of 10 d. - 10 7. The _______ is the physical path by which a message travels from sender to receiver. a. protocol b. message c. transmission medium d. sender 8. When a network upgrades to a transmission medium with a data rate that is 100 times faster, this improves the _______ of the network. a. performance b. reliability c. security d. none of the above 9. Twisted-pair wire, coaxial cable, and fiber-optic cable are all types of _______. a. protocols b. messages c. media d. data 10. Unauthorized access and viruses are issues dealing with network _______. a. performance b. reliability c. security d. none of the above 11. When a server goes down, this is a network _______ issue. a. performance b. reliability c. security d. none of the above 12. A company requires its users to change passwords every month. This improves the _____ of the network. a. performance b. reliability c. security d. none of the above 1 Name : ____________________________________ID_____________________ 13. A company requires each employee to power off his computer at the end of the day. This rule was implemented to make the network _______. a. perform better b. more reliable c. more secure d. more error-free 14._______ refers to when data should be sent and how fast the data can be sent. a. Syntax b. Semantics c. Timing d. none of the above 15._______ is a network reliability issue. a. The number of users c. The frequency of failure b. The type of transmission medium d. Unauthorized access 16._______ refers to the structure or format of the data, the order in which they are presented. a. Syntax b. Semantics c. Timing d. none of the above 17. A _______ is a set of devices (nodes) connected by media links. a. message b. protocol c. network d. distributor 18._______ refers to the meaning of each section of bits. a. Syntax b. Semantics c. Timing d. none of the above 19.The _______ is an example of a simplex device. a. repeater b. tap c. walkie-talkie d. keyboard 20._______ is an example of a full-duplex system. a. The keyboard b. CB radio c. The telephone network d. The repeater --------------------------------Answer 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2