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Flashcards in _wk_3_Questions_And_Answers Deck (56):
1

A frame is an unformatted sequence of bits. True or false?

FALSE

2

Type of modulation that is not used in satellite transmission:

Amplitude is NOT used. Only frequesncy and phase modulations are used

3

Frequency and period are multiplicative

Inverses

4

Frequency and period are the divisive inverse of each other. True or false?

FALSE

5

The insulation of a fiber optic cable is also called its cladding. True or False?

TRUE

6

Amplitude is more susceptible to noise than either frequency or phase modulation. True or False?

TRUE

7

Is an IP Address part of the physcial layer?

No

8

What are the 4 physical layer components:

1. signaling methods used for conveying data and translating 2. circuit configuration that carries data, 3. transmission medium used - which the circuits are based on, 4 devices typically associated with the layer

9

in a point to point circuit, more than 2 devices can share the circuit at one time. True or false

False. The point to point configuration, a dedicated circuit is established between 2 devices

10

As a measurement, bits per second is associated with:

bit rate

11

Types of modulation that can be used in radio broadcasting include

amplitude, frequency and phase

12

What components are part of the physical layer?

Signalling method and circuit configuration

13

Most network connections use multipoint circuits. True or false

TRUE

14

The physcial layer is responsible for framing data bits. True or false

FALSE

15

The physical layer encompasses such things as cables and connectors. True or false

TRUE

16

Manchester is a digital encoding scheme used in Ethernet networks. True or false.

TRUE

17

The physical layer assigns no meaning to the data bits it is transmitting. True or false

TRUE

18

Thinnet is mostly being replaced with fiber optic cable. True or false

False

19

Transmission properties are defined at the physical layer. True or false

TRUE

20

The capacity of a circuit to carry data is called

bandwidth

21

An analog wave can have only a finite, or limited, number of values or ranges. True or false

FALSE

22

List 3 types of cables

twisted pair, coaxial, fiber optic

23

What allows the sender and receiver to synchronize their transmissions:

Clocking

24

A cycle is the completion of one full pattern of a wave for frequency modulation. True or false

TRUE

25

In the OSI and TCP/IP models, the physical layer communicaes directly with the________ layer

data link

26

Most networks that use UTP, use category 1 cable the most. True or false

FALSE

27

A unit representing 1,000 is called

kilo

28

What does not required an external clocking for synchronization?

biphase

29

Measures the ability of a material to reflect light rays:

refraction Index

30

Light emitting diodes are the most common light source for fiber optic. True or false

TRUE

31

When something is effective it will also be efficient. True or false

FALSE

32

Analog communications might use copper, fiber optic, or wireless media. True or false

TRUE

33

When the symbol and bit rate are not the same we have _____________ signal modulation.

complex

34

Bit rate and symbol rate are always the same. True or false.

FALSE

35

Te physical layer of the OSI and TCP/IP models is very different. True or false

FALSE

36

The bit interval is the duration it takes a single bit to be transmitted. True or False

TRUE

37

A broadband connection has only one channel. True or false

FALSE

38

UTP is more susceptib le to noise than either coaxial or fier optic cabling. True or false

TRUE

39

With digital signaling, the use of external clocs is more efficient than the use of self-clocking encoding scheme. True or false

False.

40

Analog waves can be modulated to represent binary 0s and 1s. True or false.

TRUE

41

Full-duplex circuits allow for simultaneous sending and receiving of data transmissions. True or false

TRUE

42

What determines how many bits will transmit one time as a block?

transmission mode

43

another term used for multipoint:

multidrop

44

Bipolar encoding has a direct current component. True or false

FALSE

45

if only two amplitudes are defined, how many bits per amplitude can be represented:

2

46

Term associated with a continuous representation:

analog

47

Data bits are frequently passed through _____ in a connector

pins

48

The binary bits 1 and 2 are used to encode data. True or false

FALSE

49

A circuit is the link used by data in its transmission from one device to another. True or false

TRUE

50

Requires eight separate wires for transmitting eight bits at one time in a block

parallel

51

Circuit configuration is not a component of the physical layer. True or false

FALSE

52

10Base5 is an example of a braodband circuit. True or false

FALSE

53

A disadvantage of fiber optic cable is that it is easy to tap into. True or false

FALSE

54

Frequency is measured in hertz. True or false

TRUE

55

Digital signals can suffer more noise problems than analog signals. True or false.

FALSE

56

The highest quality fiber optic cable is made from glass. True or false.

TRUE