Network Fundamentals

Question 1

is the act of transmitting and exchanging information between people, people and objects, and objects and objects through various media and actions.

Answer 1

Communication

Question 2

The … is the largest computer network in the world. It’s predecessor, Advanced Research Project Agency Network (ARPAnet), was born in 1969.

Answer 2

Internet

Question 3

refers to communication between terminal devices throughout a computer network.

Answer 3

Network communication

Question 4

What is a signal?

Answer 4

• Means of communication
• Communicated information
• Electronics transmitted information

Question 5

This refers to a sign or indication that conveys information about something or that tells someone to do something.

Answer 5

Means of communication

Question 6

This refers to an event or act, which shows that something exists or that gives information about something

Answer 6

Communicated information

Question 7

This refers to a detectable physical quantity or impulse (as a voltage, current, or magnetic field strength) by which messages or information can be transmitted via telegraphy, telephone, radio, radar, or television.

Answer 7

Electronics transmitted information

Question 8

Examples of signals

Answer 8

• Electrical signals (voltages and currents in a circuit)
• Acoustic signals (audio or speech signals)
• Video signals (intensity variations in an image)
• Biological signals (sequences of bases in a gene)
• Noises (interference - unwanted and undesired form of signal)

Question 9

The main purpose of the signal is to ensure that the synchronization between the sender and receiver over a physical medium is maintained, as well as support transmission of the data signal in a form that can be interpreted by both the sender and receiver. [T/F]

Answer 9

True

Question 10

refer to disturbances in that energy to travel through a medium from one location to another

Answer 10

waves

Question 11

refers to the horizontal distance of a wave from a point to the corresponding point on the next wave. This is measured in meters (m) in SI

Answer 11

Wavelength

Question 12

It refers to a vertical distance from a given point on the way from the horizontal axis.

This is measured in volts, amperes, or watts, depending on the type of signal.

Answer 12

Amplitude

Question 13

It describes the position of the waveform relative to time zero; it is a measurement of the delay of the wave relative to some fixed reference point or another sine wave

Answer 13

Phase

Question 14

It refers to the number of waves made per second or as cycles per second. It is reciprocal of the period to complete one (1) wave cycle. The unit for frequency is in Hertz (Hz); 1 Hz means 1 cycle per second (cps)

Answer 14

Frequency

Question 15

This refers to the amount of time (expressed in seconds) required to complete one (1) full cycle.

Answer 15

Period