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1/13 Szoftverfejlesztés > Network essentials 2 > Flashcards

Network essentials 2 Flashcards

1
Q

What is the purpose of the OSI physical layer?

A

transmitting bits across the local media

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2
Q

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

A

They allow for full-duplex connectivity.

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3
Q

Which characteristic describes crosstalk?

A

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

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4
Q

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

A

twisting opposing circuit wire pairs together

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5
Q

Match the situation with the appropriate use of network media.

A

Copper cables: horizontal cabling structure; desktop PCs in an enterprise office

Fiber optic: backbone cabling in an enterprise; long-haul networks

Wireless: guest access in a coffee shop; waiting rooms in a hospital

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6
Q

A network administrator is measuring the transfer of bits across the company backbone for a mission critical financial application. The administrator notices that the network throughput appears lower than the bandwidth expected. Which three factors could influence the differences in throughput? (Choose three.)

A
  1. the amount of traffic that is currently crossing the network
  2. the type of traffic that is crossing the network
  3. the latency that is created by the number of network devices that the data is crossing
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7
Q

What are two characteristics of fiber-optic cable? (Choose two.)

A

It is not affected by EMI or RFI.

It is more expensive than UTP cabling is.

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8
Q

What is a primary role of the Physical layer in transmitting data on the network?

A

create the signals that represent the bits in each frame on to the media

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9
Q

With the use of unshielded twisted-pair copper wire in a network, what causes crosstalk within the cable pairs?

A

the magnetic field around the adjacent pairs of wire

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10
Q

Refer to the graphic. What type of cabling is shown?

A

fiber

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11
Q

In addition to the cable length, what two factors could interfere with the communication carried over UTP cables? (Choose two.)

A

crosstalk

electromagnetic interference

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12
Q

Refer to the graphic. What type of cabling is shown?

A

UTP

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13
Q

Which two devices commonly affect wireless networks? (Choose two.)

A

cordless phones

microwaves

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14
Q

Which two statements describe the services provided by the data link layer? (Choose two.)

A

It manages the access of frames to the network media.

It packages various Layer 3 PDUs into a frame format that is compatible with the network interface.

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15
Q

What is the function of the CRC value that is found in the FCS field of a frame?

A

to verify the integrity of the received frame

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16
Q

What is contained in the trailer of a data-link frame?

A

error detection

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17
Q

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

A

They vary depending on protocols

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18
Q

A network team is comparing physical WAN topologies for connecting remote sites to a headquarters building. Which topology provides high availability and connects some, but not all, remote sites?

A

partial mesh

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19
Q

Which two fields or features does Ethernet examine to determine if a received frame is passed to the data link layer or discarded by the NIC? (Choose two.)

A

Frame Check Sequence

minimum frame size

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20
Q

Which media communication type does not require media arbitration in the data link layer?

A

full-duplex

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21
Q

Which statement describes an extended star topology?

A

End devices connect to a central intermediate device, which in turn connects to other central intermediate devices.

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22
Q

What is a characteristic of the LLC sublayer?

A

It places information in the frame allowing multiple Layer 3 protocols to use the same network interface and media.

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23
Q

What are three ways that media access control is used in networking? (Choose three.)

A

Ethernet utilizes CSMA/CD.

Media access control provides placement of data frames onto the media.

Data link layer protocols define the rules for access to different media.

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24
Q

During the encapsulation process, what occurs at the data link layer for a PC connected to an Ethernet network?

A

The physical address is added.

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25
Q

What three items are contained in an Ethernet header and trailer? (Choose three.)

A

source MAC address

destination MAC address

error-checking information

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26
Q

What type of communication rule would best describe CSMA/CD?

A

access method

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27
Q

Which three basic parts are common to all frame types supported by the data link layer? (Choose three.)

A

header

data

trailer

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28
Q

Which statement is true about the CSMA/CD access method that is used in Ethernet?

A

All network devices must listen before transmitting.

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29
Q

What is the auto-MDIX feature on a switch?

A

the automatic configuration of an interface for a straight-through or a crossover Ethernet cable connection

30
Q

Refer to the exhibit. What is the destination MAC address of the Ethernet frame as it leaves the web server if the final destination is PC1?

A

00-60-2F-3A-07-CC

31
Q

A Layer 2 switch is used to switch incoming frames from a 1000BASE-T port to a port connected to a 100Base-T network. Which method of memory buffering would work best for this task?

A

shared memory buffering

32
Q

What are two examples of the cut-through switching method? (Choose two.

A

fast-forward switching

fragment-free switching

33
Q

Which frame forwarding method receives the entire frame and performs a CRC check to detect errors before forwarding the frame?

A

store-and-forward switching

34
Q

What is the purpose of the FCS field in a frame?

A

to determine if errors occurred in the transmission and reception

35
Q

Which switching method has the lowest level of latency?

A

fast-forward

36
Q

A network administrator is connecting two modern switches using a straight-through cable. The switches are new and have never been configured. Which three statements are correct about the final result of the connection? (Choose three.)

A

The link between the switches will work at the fastest speed that is supported by both switches.

The link between switches will work as full-duplex.

The auto-MDIX feature will configure the interfaces eliminating the need for a crossover cable

37
Q

Which advantage does the store-and-forward switching method have compared with the cut-through switching method?

A

frame error checking

38
Q

When the store-and-forward method of switching is in use, what part of the Ethernet frame is used to perform an error check?

A

CRC in the trailer

39
Q

Which switching method uses the CRC value in a frame?

A

store-and-forward

40
Q

What are two actions performed by a Cisco switch? (Choose two.)

A

using the source MAC addresses of frames to build and maintain a MAC address table

utilizing the MAC address table to forward frames via the destination MAC address

41
Q

Which two statements describe features or functions of the logical link control sublayer in Ethernet standards? (Choose two.)

A

Logical link control is implemented in software.

The data link layer uses LLC to communicate with the upper layers of the protocol suite.

42
Q

What is the auto-MDIX feature?

A

It enables a device to automatically configure an interface to use a straight-through or a crossover cable.

43
Q

What is one advantage of using the cut-through switching method instead of the store-and-forward switching method?

A

has a lower latency appropriate for high-performance computing applications​

44
Q

Which is a multicast MAC address?

A

01-00-5E-00-00-03

45
Q

Refer to the exhibit. What is wrong with the displayed termination?

A

The untwisted length of each wire is too long.

46
Q

Refer to the exhibit. The PC is connected to the console port of the switch. All the other connections are made through FastEthernet links. Which types of UTP cables can be used to connect the devices?​

A

1 - rollover, 2 - straight-through, 3 - crossover

47
Q

What does the term “attenuation” mean in data communication?

A

loss of signal strength as distance increases

48
Q

What makes fiber preferable to copper cabling for interconnecting buildings? (Choose three.)

A

greater distances per cable run

limited susceptibility to EMI/RFI

greater bandwidth potential

49
Q

What OSI physical layer term describes the process by which one wave modifies another wave?

A

modulation

50
Q

What OSI physical layer term describes the capacity at which a medium can carry data?

A

modulation

51
Q

What OSI physical layer term describes the capacity at which a medium can carry data?

A

bandwidth

52
Q

What OSI physical layer term describes the measure of the transfer of bits across a medium over a given period of time?

A

throughput

53
Q

What OSI physical layer term describes the amount of time, including delays, for data to travel from one point to another?

A

latency

54
Q

What OSI physical layer term describes the amount of time, including delays, for data to travel from one point to another?

A

latency

55
Q

What OSI physical layer term describes the measure of usable data transferred over a given period of time?

A

goodput

56
Q

What OSI physical layer term describes the physical medium which uses electrical pulses?

A

copper cable

57
Q

What OSI physical layer term describes the physical medium that uses the propagation of light?

A

fiber-optic cable

58
Q

What OSI physical layer term describes the physical medium for microwave transmissions?

A

air

59
Q

Which two functions are performed at the MAC sublayer of the OSI data link layer? (Choose two.)

A

Controls the NIC responsible for sending and receiving data on the physical medium.

Implements a trailer to detect transmission errors.

Case 2:
Provides synchronization between source and target nodes.

Integrates various physical technologies.

case 3:
Provides synchronization between source and target nodes.

Implements a trailer to detect transmission errors.

Case 4:
Integrates various physical technologies.

Provides synchronization between source and target nodes.

case 5:
Integrates various physical technologies.

Controls the NIC responsible for sending and receiving data on the physical medium.

Case 6:
Controls the NIC responsible for sending and receiving data on the physical medium.

Provides a mechanism to allow multiple devices to communicate over a shared medium.

60
Q

Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.

A

Enables IPv4 and IPv6 to utilize the same network interface and media.

Places information in the frame that identifies which network layer protocol is being used for the frame.

61
Q

Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)

A

Adds Layer 2 control information to network protocol data.

Places information in the frame that identifies which network layer protocol is being used for the frame.

62
Q

Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)

A

Adds Layer 2 control information to network protocol data.

Enables IPv4 and IPv6 to utilize the same network interface and media.

63
Q

Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)

A

Enables IPv4 and IPv6 to utilize the same network interface and media.

Adds Layer 2 control information to network protocol data.

64
Q

What action will occur if a switch receives a frame with the destination MAC address FF:FF:FF:FF:FF:FF?

A

The switch forwards it out all ports except the ingress port.

65
Q

What action will occur if a switch receives a frame with the destination MAC address 01:00:5E:00:00:D9?

A

The switch forwards it out all ports except the ingress port.

66
Q

What action will occur if a host receives a frame with a destination MAC address of FF:FF:FF:FF:FF:FF?

A

The host will process the frame.

67
Q

What action will occur if a switch receives a frame and does have the source MAC address in the MAC table?

A

The switch refreshes the timer on that entry.

68
Q

What action will occur if a host receives a frame with a destination MAC address of FF:FF:FF:FF:FF:FF?

A

The host will process the frame.

69
Q

What action will occur if a host receives a frame with a destination MAC address it does not recognize?

A

The host will discard the frame.

70
Q

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

A

straight-through

1/13 Szoftverfejlesztés (11 decks)

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