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
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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
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