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CPE118-41L Checkpoint exams > M4-M7 CHECKPOING EXAM > Flashcards

M4-M7 CHECKPOING EXAM Flashcards

1
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

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?
* 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.

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3
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

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4
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

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5
Q

Match the situation with the appropriate use of network media.

  • horizontal cabling structure
  • desktop PCs in an enterprise
A

Copper Cables

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6
Q

Match the situation with the appropriate use of network media.

  • backbone cabling in an enterprise
  • long-haul networks
A

Fiber Optics

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7
Q

Match the situation with the appropriate use of network media.

  • guest access in a coffee shop
  • waiting rooms in a hospital
A

Wireless

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8
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.)
* the amount of traffic that is currently crossing the network
* the sophistication of the encapsulation method applied to the data
* the type of traffic that is crossing the network
* the latency that is created by the number of network devices that the data is crossing
* the bandwidth of the WAN connection to the Internet
* the reliability of the gigabit Ethernet infrastructure of the backbone

A
  • the amount of traffic that is currently crossing the network
  • the type of traffic that is crossing the network
  • the latency that is created by the number of network devices that the data is crossing
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9
Q

What are two characteristics of fiber-optic cable? (Choose two.)
* It is not affected by EMI or RFI.
* Each pair of cables is wrapped in metallic foil.
* It combines the technique of cancellation, shielding, and twisting to protect data.
* It typically contains 4 pairs of fiber-optic wires.
* It is more expensive than UTP cabling is.

A
  • It is not affected by EMI or RFI.
  • It is more expensive than UTP cabling is.
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10
Q

What is a primary role of the Physical layer in transmitting data on the network?
* create the signals that represent the bits in each frame on to the media
* provide physical addressing to the devices
* determine the path packets take through the network
* control data access to the media

A

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

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11
Q

With the use of unshielded twisted-pair copper wire in a network, what causes crosstalk within the cable pairs?
* the magnetic field around the adjacent pairs of wire
* the use of braided wire to shield the adjacent wire pairs
* the reflection of the electrical wave back from the far end of the cable
* the collision caused by two nodes trying to use the media simultaneously

A

the magnetic field around the adjacent pairs of wire

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12
Q

___ cable consists of four pairs of color-coded wires that have been twisted together and then encased in a flexible plastic sheath.

A

UTP cable

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13
Q

___ cable uses four pairs of wires, each wrapped in a foil shield, which are then wrapped in an overall metallic braid or foil.

A

STP

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14
Q

_____ cable uses a copper conductor and a layer of flexible plastic insulation surrounds the copper conductor.

A

Coaxial

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15
Q

____ cable is a flexible, extremely thin, transparent strand of glass surrounded by plastic insulation.

A

Fiber

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16
Q

In addition to the cable length, what two factors could interfere with the communication carried over UTP cables? (Choose two.)
* crosstalk
* bandwidth
* size of the network
* signal modulation technique
* electromagnetic interference

A

crosstalk

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17
Q

Which two devices commonly affect wireless networks? (Choose two.)
* Blu-ray players
* home theaters
* cordless phones
* microwaves
* incandescent light bulbs
* external hard drives

A
  • cordless phones
  • microwaves
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18
Q

Which two statements describe the services provided by the data link layer? (Choose two.)
* It defines the end-to-end delivery addressing scheme.
* It maintains the path between the source and destination devices during the data transmission.
* It manages the access of frames to the network media.
* It provides reliable delivery through link establishment and flow control.
* It ensures that application data will be transmitted according to the prioritization.
* It packages various Layer 3 PDUs into a frame format that is compatible with the network interface.

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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19
Q

What is the function of the CRC value that is found in the FCS field of a frame?
* to verify the integrity of the received frame
* to verify the physical address in the frame
* to verify the logical address in the frame
* to compute the checksum header for the data field in the frame

A

to verify the integrity of the received frame

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20
Q

What is contained in the trailer of a data-link frame?
* logical address
* physical address
* data
* error detection

A

error detection

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21
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.

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22
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?
* mesh
* partial mesh
* hub and spoke
* point-to-point

A

partial mesh

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23
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.)
* auto-MDIX
* CEF
* Frame Check Sequence
* minimum frame size
* source MAC address

A
  • Frame Check Sequence
  • minimum frame size
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24
Q

Which media communication type does not require media arbitration in the data link layer?
* deterministic
* half-duplex
* full-duplex
* controlled access

A

full-duplex

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25
Q

Which statement describes an extended star topology?
* End devices connect to a central intermediate device, which in turn connects to other central intermediate devices.
* End devices are connected together by a bus and each bus connects to a central intermediate device.
* Each end system is connected to its respective neighbor via an intermediate device.
* All end and intermediate devices are connected in a chain to each other.

A

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

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26
Q

What is a characteristic of the LLC sublayer?
* It provides the logical addressing required that identifies the device.
* It provides delimitation of data according to the physical signaling requirements of the medium.
* It places information in the frame allowing multiple Layer 3 protocols to use the same network interface and media.
* It defines software processes that provide services to the physical layer.

A

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

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27
Q

What are three ways that media access control is used in networking? (Choose three.)
* Ethernet utilizes CSMA/CD.
* Media access control provides placement of data frames onto the media.
* Contention-based access is also known as deterministic.
* 802.11 utilizes CSMA/CD.
* Data link layer protocols define the rules for access to different media.
* Networks with controlled access have reduced performance due to data collisions.

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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28
Q

During the encapsulation process, what occurs at the data link layer for a PC connected to an Ethernet network?
* An IP address is added.
* The logical address is added.
* The physical address is added.
* The process port number is added.

A

The physical address is added.

29
Q

What three items are contained in an Ethernet header and trailer? (Choose three.)
* source IP address
* source MAC address
* destination IP address
* destination MAC address
* error-checking information

A
  • destination MAC address
  • error-checking information
  • source MAC address
30
Q

What type of communication rule would best describe CSMA/CD?
* access method
* flow control
* message encapsulation
* message encoding

A

access method

31
Q

Which three basic parts are common to all frame types supported by the data link layer? (Choose three.)
* header
* type field
* MTU size
* data
* trailer
* CRC value

A
  • data
  • trailer
  • header
32
Q

Which statement is true about the CSMA/CD access method that is used in Ethernet?
* When a device hears a carrier signal and transmits, a collision cannot occur.
* A jamming signal causes only devices that caused the collision to execute a backoff algorithm.
* All network devices must listen before transmitting.
* Devices involved in a collision get priority to transmit after the backoff period.

A

All network devices must listen before transmitting.

33
Q

What is the auto-MDIX feature on a switch?
* the automatic configuration of an interface for 10/100/1000 Mb/s operation
* the automatic configuration of an interface for a straight-through or a crossover Ethernet cable connection
* the automatic configuration of full-duplex operation over a single Ethernet copper or optical cable
* the ability to turn a switch interface on or off accordingly if an active connection is detected

A

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

34
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?
* port-based buffering
* level 1 cache buffering
* shared memory buffering
* fixed configuration buffering

A

shared memory buffering

35
Q

What are two examples of the cut-through switching method? (Choose two.)
* store-and-forward switching
* fast-forward switching
* CRC switching
* fragment-free switching
* QOS switching

A
  • fragment-free switching
  • fast-forward switching
36
Q

Which frame forwarding method receives the entire frame and performs a CRC check to detect errors before forwarding the frame?
* cut-through switching
* store-and-forward switching
* fragment-free switching
* fast-forward switching

A

store-and-forward switching

37
Q

What is the purpose of the FCS field in a frame?
* to obtain the MAC address of the sending node
* to verify the logical address of the sending node
* to compute the CRC header for the data field
* to determine if errors occurred in the transmission and reception

A

to determine if errors occurred in the transmission and reception

38
Q

Which switching method has the lowest level of latency?
* cut-through
* store-and-forward
* fragment-free
* fast-forward

A

fast-forward

39
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.)
* 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.
* If both switches support different speeds, they will each work at their own fastest speed.
* The auto-MDIX feature will configure the interfaces eliminating the need for a crossover cable.
* The connection will not be possible unless the administrator changes the cable to a crossover cable.
* The duplex capability has to be manually configured because it cannot be negotiated.

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.
40
Q

Which advantage does the store-and-forward switching method have compared with the cut-through switching method?
* collision detecting
* frame error checking
* faster frame forwarding
* frame forwarding using IPv4 Layer 3 and 4 information

A

frame error checking

41
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?
* CRC in the trailer
* source MAC address in the header
* destination MAC address in the header
* protocol type in the header

A

CRC in the trailer

42
Q

Which switching method uses the CRC value in a frame?
* cut-through
* fast-forward
* fragment-free
* store-and-forward

A

store-and-forward

43
Q

What are two actions performed by a Cisco switch? (Choose two.)
* building a routing table that is based on the first IP address in the frame header
* using the source MAC addresses of frames to build and maintain a MAC address table
* forwarding frames with unknown destination IP addresses to the default gateway
* utilizing the MAC address table to forward frames via the destination MAC address
* examining the destination MAC address to add new entries to the MAC address table

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
44
Q

Which two statements describe features or functions of the logical link control sublayer in Ethernet standards? (Choose two.)
* Logical link control is implemented in software.
* Logical link control is specified in the IEEE 802.3 standard.
* The LLC sublayer adds a header and a trailer to the data.
* The data link layer uses LLC to communicate with the upper layers of the protocol suite.
* The LLC sublayer is responsible for the placement and retrieval of frames on and off the media.

A
  • Logical link control is implemented in software.
  • The data link layer uses LLC to communicate with the upper layers of the protocol suite.
45
Q

What is the auto-MDIX feature?
* It enables a device to automatically configure an interface to use a straight-through or a crossover cable.
* It enables a device to automatically configure the duplex settings of a segment.
* It enables a device to automatically configure the speed of its interface.
* It enables a switch to dynamically select the forwarding method.

A

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

46
Q

What is one advantage of using the cut-through switching method instead of the store-and-forward switching method?
* has a positive impact on bandwidth by dropping most of the invalid frames
* makes a fast forwarding decision based on the source MAC address of the frame
* has a lower latency appropriate for high-performance computing applications
* provides the flexibility to support any mix of Ethernet speeds

A

has a lower latency appropriate for high-performance computing applications

47
Q

. Which is a multicast MAC address?
* FF-FF-FF-FF-FF-FF
* 5C-26-0A-4B-19-3E
* 01-00-5E-00-00-03
* 00-26-0F-4B-00-3E

A

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

48
Q

What does the term “attenuation” mean in data communication?
* loss of signal strength as distance increases
* time for a signal to reach its destination
* leakage of signals from one cable pair to another
* strengthening of a signal by a networking device

A

loss of signal strength as distance increases

49
Q

What makes fiber preferable to copper cabling for interconnecting buildings? (Choose three.)
* greater distances per cable run
* lower installation cost
* limited susceptibility to EMI/RFI
* durable connections
* greater bandwidth potential
* easily terminated

A
  • greater distances per cable run
  • limited susceptibility to EMI/RFI
  • greater bandwidth potential
50
Q

What OSI physical layer term describes the process by which one wave modifies another wave?
* modulation
* IEEE
* EIA/TIA
* air

A

modulation

51
Q

What OSI physical layer term describes the capacity at which a medium can carry data?
* bandwidth
* IEEE
* EIA/TIA
* air

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?
* throughput
* bandwidth
* latency
* goodput

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?
* latency
* bandwidth
* throughput
* goodput

A

latency

54
Q

What OSI physical layer term describes the measure of usable data transferred over a given period of time?
* goodput
* fiber-optic cable
* air
* copper cable

A

goodput

55
Q

What OSI physical layer term describes the physical medium which uses electrical pulses?
* copper cable
* fiber-optic cable
* air
* goodput

A

copper cable

56
Q

What OSI physical layer term describes the physical medium that uses the propagation of light?
* fiber-optic cable
* goodput
* latency
* throughput

A

fiber-optic cable

57
Q

What OSI physical layer term describes the physical medium for microwave transmissions?
* air
* goodput
* latency
* throughput

A

air

58
Q

Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)
* 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.
* Integrates various physical technologies.
* Implements a process to delimit fields within a Layer 2 frame.
* Controls the NIC responsible for sending and receiving data on the physical medium.

A
  • Enables IPv4 and IPv6 to utilize the same network interface and media.
  • Places information in the frame that identifies which network layer
59
Q

Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)
* 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.
* Performs data encapsulation.
* Controls the NIC responsible for sending and receiving data on the physical medium.
* Integrates various physical technologies.

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.
60
Q

Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)
* Adds Layer 2 control information to network protocol data.
* Enables IPv4 and IPv6 to utilize the same network interface and media.
* Provides data link layer addressing.
* Implements a trailer to detect transmission errors.
* Provides synchronization between source and target nodes.

A
  • Adds Layer 2 control information to network protocol data.
  • Enables IPv4 and IPv6 to utilize the same network interface and media.
61
Q

Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)
* Enables IPv4 and IPv6 to utilize the same network interface and media.
* Adds Layer 2 control information to network protocol data.
* Integrates various physical technologies.
* Implements a trailer to detect transmission errors.
* Provides synchronization between source and target nodes.

A
  • Enables IPv4 and IPv6 to utilize the same network interface and media.
  • Adds Layer 2 control information to network protocol data.
62
Q

What action will occur if a switch receives a frame with the destination MAC address FF:FF:FF:FF:FF:FF?
* The switch forwards it out all ports except the ingress port.
* The switch shares the MAC address table entry with any connected switches.
* The switch does not forward the frame.
* The switch sends the frame to a connected router because the destination MAC address is not local.

A

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

63
Q

What action will occur if a switch receives a frame with the destination MAC address 01:00:5E:00:00:D9?
* The switch forwards it out all ports except the ingress port.
* The switch does not forward the frame.
* The switch sends the frame to a connected router because the destination MAC address is not local.
* The switch shares the MAC address table entry with any connected switches.

A

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

64
Q

What action will occur if a host receives a frame with a destination MAC address of FF:FF:FF:FF:FF:FF?
* The host will process the frame.
* The host forwards the frame to the router.
* The host sends the frame to the switch to update the MAC address table.
* The host forwards the frame to all other hosts.

A

The host will process the frame.

65
Q

What action will occur if a switch receives a frame and does have the source MAC address in the MAC table?
* The switch refreshes the timer on that entry.
* The switch adds it to its MAC address table associated with the port number.
* The switch forwards the frame to the associated port.
* The switch sends the frame to a connected router because the destination MAC address is not local.

A

The switch refreshes the timer on that entry.

66
Q

What action will occur if a host receives a frame with a destination MAC address of FF:FF:FF:FF:FF:FF?
* The host will process the frame.
* The host returns the frame to the switch.
* The host replies to the switch with its own IP address.
* The host forwards the frame to all other hosts.

A

The host will process the frame.

67
Q

What action will occur if a host receives a frame with a destination MAC address it does not recognize?
* The host will discard the frame.
* The host replies to the switch with its own IP address.
* The host forwards the frame to all other hosts.
* The host returns the frame to the switch.

A

The host will discard the frame.

68
Q

Which type of UTP cable is used to connect a PC to a switch port?
* console
* rollover
* crossover
* straight-through

A

straight-through

CPE118-41L Checkpoint exams (3 decks)

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