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.
Which three basic parts are common to all frame types supported by the data link layer? (Choose three.)
CRC value
type field
data
MTU size
trailer
header
Data
Trailer
Header
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.
Devices involved in a collision get priority to transmit after the backoff period.
All network devices must listen before transmitting.
A jamming signal causes only devices that caused the collision to execute a backoff algorithm.
All network devices must listen before transmitting
What is a characteristic of the LLC sublayer?
It defines software processes that provide services to the physical layer.
It places information in the frame allowing multiple Layer 3 protocols to use the same network interface and media.
It provides delimitation of data according to the physical signaling requirements of the medium.
It provides the logical addressing required that identifies the device.
It places information in the frame allowing multiple Layer 3 protocols to use the same network interface and media.
What OSI physical layer term describes the physical medium for microwave transmissions?
air
latency
goodput
throughput
Air
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?
level 1 cache buffering
shared memory buffering
port-based buffering
fixed configuration buffering
Shared memory buffering
Which frame forwarding method receives the entire frame and performs a CRC check to detect errors before forwarding the frame?
fast-forward switching
store-and-forward switching
fragment-free switching
cut-through switching
store-and-forward switching
Which is a multicast MAC address?
00-26-0F-4B-00-3E
FF-FF-FF-FF-FF-FF
5C-26-0A-4B-19-3E
01-00-5E-00-00-03
01-00-5E-00-00-03
Which switching method has the lowest level of latency?
fragment-free
store-and-forward
fast-forward
cut-through
fast-forward
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 auto-MDIX feature will configure the interfaces eliminating the need for a crossover cable.
The link between the switches will work at the fastest speed that is supported by both switches
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.
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 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
What is the purpose of the FCS field in a frame?
to compute the CRC header for the data field
to determine if errors occurred in the transmission and reception
to verify the logical address of the sending node
to obtain the MAC address of the sending node
To determine if errors occurred in the transmission and reception
When the store-and-forward method of switching is in use, what part of the Ethernet frame is used to perform an error check?
protocol type in the header
CRC in the trailer
source MAC address in the header
destination MAC address in the header
CRC in the trailer
Which switching method uses the CRC value in a frame?
fragment-free
cut-through
fast-forward
store-and-forward
store-and-forward
What is the auto-MDIX feature?
It enables a switch to dynamically select the forwarding method.
It enables a device to automatically configure the duplex settings of a segment.
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 speed of its interface.
It enables a device to automatically configure an interface to use a straight-through or a crossover cable.
What are two examples of the cut-through switching method? (Choose two.)
QOS switching
fast-forward switching
CRC switching
store-and-forward switching
fragment-free switching
fast-forward switching
fragment-free switching
