Chapter 4-7 Mock Flashcards
What does the term “attenuation” mean in data communication?
strengthening of a signal by a networking device
leakage of signals from one cable pair to another
loss of signal strength as distance increases
time for a signal to reach its destination
Loss of signal strength as distance increases
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?
1 - rollover, 2 - straight-through, 3 - crossover
1 - crossover, 2 - rollover, 3 - straight-through
1 - rollover, 2 - crossover, 3 - straight-through
1 - crossover, 2 - straight-through, 3 - rollover
1 - rollover, 2 - straight-through, 3 - crossover
What makes fiber preferable to copper cabling for interconnecting buildings? (Choose three.)
limited susceptibility to EMI/RFI
durable connections
greater distances per cable run
greater bandwidth potential
lower installation cost
easily terminated
greater distances per cable run
greater bandwidth potential
limited susceptibility to EMI/RFI
What action will occur if a host receives a frame with a destination MAC address it does not recognize?
The host returns the frame to the switch.
The host forwards the frame to all other hosts.
The host replies to the switch with its own IP address.
The host will discard the frame.
The host will discard the frame.
Which two devices commonly affect wireless networks? (Choose two.)
cordless phones
microwaves
incandescent light bulbs
external hard drives
Blu-ray players
home theaters
cordless phones
microwaves
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 reflection of the electrical wave back from the far end of the cable
the use of braided wire to shield the adjacent wire pairs
the collision caused by two nodes trying to use the media simultaneously
The magnetic field around the adjacent pairs of wire
What are two characteristics of fiber-optic cable? (Choose two.)
It typically contains 4 pairs of fiber-optic wires.
Each pair of cables is wrapped in metallic foil.
It is not affected by EMI or RFI.
It combines the technique of cancellation, shielding, and twisting to protect data.
It is more expensive than UTP cabling is.
It is not affected by EMI or RFI.
It is more expensive than UTP cabling is.
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
determine the path packets take through the network
control data access to the media
provide physical addressing to the devices
Create the signals that represent the bits in each frame on to the media
Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)
Performs data encapsulation.
Controls the NIC responsible for sending and receiving data on the physical medium.
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.
Integrates various physical technologies.
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.
What is contained in the trailer of a data-link frame?
error detection
data
logical address
physical address
error detection
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.
They include information on user applications.
They vary depending on protocols.
Ethernet frame header fields contain Layer 3 source and destination addresses.
They vary depending on protocols.
What three items are contained in an Ethernet header and trailer? (Choose three.)
error-checking information
source MAC address
source IP address
destination MAC address
destination IP address
error-checking information
source MAC address
destination MAC address
Which two statements describe the services provided by the data link layer? (Choose two.)
It ensures that application data will be transmitted according to the prioritization.
It maintains the path between the source and destination devices during the data transmission.
It defines the end-to-end delivery addressing scheme.
It provides reliable delivery through link establishment and flow control.
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.
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.
Which media communication type does not require media arbitration in the data link layer?
half-duplex
controlled access
full-duplex
deterministic
Full-duplex
Which statement describes an extended star topology?
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.
End devices are connected together by a bus and each bus connects to a central intermediate device.
End devices connect to a central intermediate device, which in turn connects to other central intermediate devices.
End devices connect to a central intermediate device, which in turn connects to other central intermediate devices.
