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Networking Revamped > Module 4 - Physical Layer > Flashcards

Module 4 - Physical Layer Flashcards

1
Q

True or false? The physical layer is only concerned with wired network connections.

true
false

A

false

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2
Q

True or false? When a frame is encoded by the physical layer, all bits are sent over the media at the same time.

true
false

A

false

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3
Q

The physical layer of the receiving device passes bits up to which higher level layer?

application
presentation
network
data link

A

data link

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3
Q

What PDU is received by the physical layer for encoding and transmission?

frame
segment
packet

A

frame

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4
Q

Which media uses patterns of light to represent bits?

copper
wireless
fiber-optic

A

fiber-optic

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4
Q

Which media uses patterns of microwaves to represent bits?

copper
wireless
fiber-optic

A

wireless

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5
Q

Which media uses electrical pulses to represent bits?

copper
wireless
fiber-optic

A

copper

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5
Q

Which of these is the name for the capacity of a medium to carry data?

bandwidth
throughput
goodput

A

bandwidth

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6
Q

Which of these is a measure of the transfer of bits across the media?

bandwidth
throughput
goodput

A

throughput

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7
Q

Which of the following attaches antennas to wireless devices? It can also be bundled with fiber-optic cabling for two-way data transmission.

UTP
STP
coaxial

A

coaxial

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8
Q

Which of the following terminates with BNC, N type and F type connectors?

UTP
STP
coaxial

A

coaxial

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8
Q

Which of the following counters EMI and RFI by using shielding techniques and special connectors?

UTP
STP
coaxial

A

STP

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8
Q

Which of the following is the most common network media?

UTP
STP
coaxial

A

UTP

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9
Q

Which of the following fiber-optic cable types can help data travel approximately 500 meters?

multimode
single-mode

A

multimode

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10
Q

Which of the following fiber-optic cable types use lasers in a single stream as a data light source transmitter?

multimode
single-mode

A

single-mode

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10
Q

Which of the following fiber-optic cable types use light emitting diodes (LEDs) as a data light source transmitter?

multimode
single-mode

A

multimode

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11
Q

Which of the following fiber-optic cable types is used to connect long-distance telephony and cable TV applications?

multimode
single-mode

A

single-mode

12
Q

Which of the following fiber-optic cable types can travel approximately 100 km?

multimode
single-mode

A

single-mode

12
Q

Which of the following fiber-optic cable types is used within a campus network?

multimode
single-mode

A

multimode

13
Q

True or false. Wireless is not well suited for enterprise networks.

true
false

A

false

14
Q

True or false. Wireless LANs operate in full-duplex allowing all devices to send or receive data at the same time so the number of users does not impact performance.

true
false

A

false

15
Q

Which standards organization oversees development of wireless LAN standards?

IANA
IEEE
IOS
TIA

A

IEEE

16
Q

Which of the following wireless standards is best suited for industrial and IoT environments?

Zigbee
WiMAX
Wi-Fi
Bluetooth

A

Zigbee

17
Q

Which of the following wireless standards is used for Personal Area Networks (PANs) and allows devices to communicate over distances of 1 to 100 meters?

Zigbee
WiMAX
Wi-Fi
Bluetooth

A

Bluetooth

18
Q

A network administrator is designing a new network infrastructure that includes both wired and wireless connectivity. Under which situation would a wireless connection be recommended?

The end-user device only has an Ethernet NIC.
The end-user device requires a dedicated connection because of performance requirements.
The end-user device needs mobility when connecting to the network.
The end-user device area has a high concentration of RFI.

A

The end-user device needs mobility when connecting to the network.

19
Q

A network administrator is troubleshooting connectivity issues on a server. Using a tester, the administrator notices that the signals generated by the server NIC are distorted and not usable. In which layer of the OSI model is the error categorized?

presentation layer
network layer
physical layer
data link layer

A

physical layer

20
Q

What type of cable is used to connect a workstation serial port to a Cisco router console port?

crossover
rollover
straight-through
coaxial

A

rollover

21
Q

Which type of UTP cable is used to connect a PC to a switch port?

console
rollover
crossover
straight-through

A

straight-through

22
Q

What is the definition of bandwidth?

the measure of the transfer of bits across the media over a given period of time
the speed at which bits travel on the network
the amount of data that can flow from one place to another in a given amount of time
the measure of usable data transferred over a given period of time

A

the amount of data that can flow from one place to another in a given amount of time

22
Q

What is indicated by the term throughput?

the guaranteed data transfer rate offered by an ISP
the capacity of a particular medium to carry data
the measure of the usable data transferred across the media
the measure of the bits transferred across the media over a given period of time
the time it takes for a message to get from sender to receiver

A

the measure of the bits transferred across the media over a given period of time

22
Q

A wireless LAN is being deployed inside the new one room office that is occupied by the park ranger. The office is located at the highest part of the national park. After network testing is complete, the technicians report that the wireless LAN signal is occasionally affected by some type of interference. What are two possible causes of the signal distortion? (Choose two.)

the microwave oven
the large number of trees that surround the office
the cellular phones that are used by the employees
the elevated location where the wireless LAN was installed
the number of wireless devices that are used in the wireless LAN

A

the microwave oven
the cellular phones that are used by the employees

23
Q

Which statement correctly describes frame encoding?

It uses the characteristic of one wave to modify another wave.
It transmits data signals along with a clock signal which occurs at evenly spaced time durations.
It generates the electrical, optical, or wireless signals that represent the binary numbers of the frame.
It converts bits into a predefined code in order to provide a predictable pattern to help distinguish data bits from control bits.

A

It converts bits into a predefined code in order to provide a predictable pattern to help distinguish data bits from control bits.

23
Q

What is a characteristic of UTP cabling?

cancellation
cladding
immunity to electrical hazards
woven copper braid or metallic foil

A

cancellation

24
Q

What is the purpose of the OSI physical layer?

controlling access to media
transmitting bits across the local media
performing error detection on received frames
exchanging frames between nodes over physical network media

A

transmitting bits across the local media

25
Q

What is one advantage of using fiber optic cabling rather than copper cabling?

It is usually cheaper than copper cabling.
It is able to be installed around sharp bends.
It is easier to terminate and install than copper cabling.
It is able to carry signals much farther than copper cabling.

A

It is able to carry signals much farther than copper cabling.

25
Q

Which characteristic describes crosstalk?

the distortion of the network signal from fluorescent lighting
the distortion of the transmitted messages from signals carried in adjacent wires
the weakening of the network signal over long cable lengths
the loss of wireless signal over excessive distance from the access point

A

the distortion of the transmitted messages from signals carried in adjacent wires

26
Q

Why are two strands of fiber used for a single fiber optic connection?

The two strands allow the data to travel for longer distances without degrading.
They prevent crosstalk from causing interference on the connection.
They increase the speed at which the data can travel.
They allow for full-duplex connectivity.

A

They allow for full-duplex connectivity.

26
Q

Which two factors influence the method that is used for media access control? (Choose two.)

how data is generated by end devices applications
how the connection between nodes appears to the data link layer
how signals are encoded by the NICs on end devices
how nodes share the media
how the IP protocol forwards the packet to the destination

A

how the connection between nodes appears to the data link layer
how nodes share the media

26
Q

Which procedure is used to reduce the effect of crosstalk in copper cables?

requiring proper grounding connections
twisting opposing circuit wire pairs together
wrapping the bundle of wires with metallic shielding
designing a cable infrastructure to avoid crosstalk interference
avoiding sharp bends during installation

A

twisting opposing circuit wire pairs together

27
Q

Which statement describes a characteristic of the frame header fields of the data link layer?

They all include the flow control and logical connection fields.
Ethernet frame header fields contain Layer 3 source and destination addresses.
They vary depending on protocols.
They include information on user applications.

A

They vary depending on protocols.

28
Q

What is a characteristic of a WAN hub-and-spoke topology?

It requires that some of the branch sites be interconnected through point-to-point links.
It requires that every site be interconnected to each other through point-to-point links.
All sites require a hub device that connects to a router.
The branch sites are connected to a central site through point-to-point links.

A

The branch sites are connected to a central site through point-to-point links.

Networking Revamped (15 decks)

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