CCNA Chapter 4 Practice Questions
with All Correct Answers
Which statement is correct about multimode fiber? - Answer-SC-SC path cords are
used with multimode fiber cables
What is true concerning physical and logical topologies? - Answer-Logical topologies
refer to how a network transfers data between devices
Which method of data transfer allows information to be sent and received at the same
time? - Answer-full duplex
Which statement describes an extended star topology? - Answer-End devices connect
to a central intermediate device, which in turn connects to other central intermediate
devices
Refer to the exhibit. Which statement describes the media access control methods that
are used by the networks in the exhibit?
PC(hardline)SWITCH-network1(hardline)router(lightning bolt)-network2-router2
w/antenna(wireless connection)laptop - Answer-Network 1 uses CSMA/CD and Network
3 uses CSMA/CA
What is contained in the trailer of a data-link frame? - Answer-error detection
As data travels on the media in a stream of 1s and 0s how does a receiving node
identify the beginning and end of a frame? - Answer-The transmitting node inserts start
and stop bits into the frame.
What is the function of the CRC value that is found in the FCS field of a frame? -
Answer-To verify the integrity of the received frame.
The term _____________________ indicates the capacity of a medium to carry data
and it is typically measured in kilobits per second (kb/s) or megabits per second (Mb/s) -
Answer-bandwidth
What acronym is used to reference the data link sublayer that identifies the network
layer protocol encapsulated in the frame? - Answer-LLC
, The throughput of a FastEthernet network is 80 Mb/s. The traffic overhead for
established sessions, acknowledgments, and encapsulation is 15 Mb/s for the same
time period. What is the goodput for this network? - Answer-65 Mb/s
What is the purpose of the FCS field in a frame? - Answer-to determine if errors
occurred in the transmission and reception
Which statement describes signaling at the physical layer? - Answer-Sending the
signals asynchronously means that they are transmitted without a clock signal.
What is one main characteristic of the data link layer? - Answer-It shields the upper
layer protocol from being aware of the physical medium to be used in the
communication
What is one main characteristic of the data link layer? - Answer-It shields the upper
layer protocol from being aware of the physical medium to be used in the
communication
What are two reasons for physical layer protocols to use frame encoding techniques?
(Choose two)
-To reduce the number of collisions on the media.
-to distinguish data bits from control bits
-to provide better media error correction
-to identify where the frame starts and ends
-to increase the media throughput - Answer--to distinguish data bits from control bits
-to identify where the frame starts and ends
What is indicated by the term throughput? - Answer-the measure of the bits transferred
across the media over a given period of time.
A network administrator notices that some newly installed Ethernet cabling is carrying
corrupt and distorted data signals. The new cabling was installed in the ceiling close to
fluorescent lights and electrical equipment. Which two factors may interfere with the
copper cabling and result in signal distortion and data corruption? (Choose two.)
-EMI
-crosstalk
-RFI
-signal attenuation
-extended length of cabling - Answer-EMI
RFI
Which characteristic describes crosstalk? - Answer-the distortion of the transmitted
messages from signals carried in adjacent wires
with All Correct Answers
Which statement is correct about multimode fiber? - Answer-SC-SC path cords are
used with multimode fiber cables
What is true concerning physical and logical topologies? - Answer-Logical topologies
refer to how a network transfers data between devices
Which method of data transfer allows information to be sent and received at the same
time? - Answer-full duplex
Which statement describes an extended star topology? - Answer-End devices connect
to a central intermediate device, which in turn connects to other central intermediate
devices
Refer to the exhibit. Which statement describes the media access control methods that
are used by the networks in the exhibit?
PC(hardline)SWITCH-network1(hardline)router(lightning bolt)-network2-router2
w/antenna(wireless connection)laptop - Answer-Network 1 uses CSMA/CD and Network
3 uses CSMA/CA
What is contained in the trailer of a data-link frame? - Answer-error detection
As data travels on the media in a stream of 1s and 0s how does a receiving node
identify the beginning and end of a frame? - Answer-The transmitting node inserts start
and stop bits into the frame.
What is the function of the CRC value that is found in the FCS field of a frame? -
Answer-To verify the integrity of the received frame.
The term _____________________ indicates the capacity of a medium to carry data
and it is typically measured in kilobits per second (kb/s) or megabits per second (Mb/s) -
Answer-bandwidth
What acronym is used to reference the data link sublayer that identifies the network
layer protocol encapsulated in the frame? - Answer-LLC
, The throughput of a FastEthernet network is 80 Mb/s. The traffic overhead for
established sessions, acknowledgments, and encapsulation is 15 Mb/s for the same
time period. What is the goodput for this network? - Answer-65 Mb/s
What is the purpose of the FCS field in a frame? - Answer-to determine if errors
occurred in the transmission and reception
Which statement describes signaling at the physical layer? - Answer-Sending the
signals asynchronously means that they are transmitted without a clock signal.
What is one main characteristic of the data link layer? - Answer-It shields the upper
layer protocol from being aware of the physical medium to be used in the
communication
What is one main characteristic of the data link layer? - Answer-It shields the upper
layer protocol from being aware of the physical medium to be used in the
communication
What are two reasons for physical layer protocols to use frame encoding techniques?
(Choose two)
-To reduce the number of collisions on the media.
-to distinguish data bits from control bits
-to provide better media error correction
-to identify where the frame starts and ends
-to increase the media throughput - Answer--to distinguish data bits from control bits
-to identify where the frame starts and ends
What is indicated by the term throughput? - Answer-the measure of the bits transferred
across the media over a given period of time.
A network administrator notices that some newly installed Ethernet cabling is carrying
corrupt and distorted data signals. The new cabling was installed in the ceiling close to
fluorescent lights and electrical equipment. Which two factors may interfere with the
copper cabling and result in signal distortion and data corruption? (Choose two.)
-EMI
-crosstalk
-RFI
-signal attenuation
-extended length of cabling - Answer-EMI
RFI
Which characteristic describes crosstalk? - Answer-the distortion of the transmitted
messages from signals carried in adjacent wires
