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CCNA 1 v7 Modules 4 - 7 : Ethernet
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□ Dec 18,2019 | U Last Updated: Aug 31, 2024 |
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Modules 4 - 7 of the CCNA1 - Introduction to
Networks v7.0 (ITN)
1. 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
• exchanging frames between nodes over physical network
media
2. 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.

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Protocols Answers
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Ports and Addresses Answers
12.5.8 Check Your Understanding -
Dynamic Addressing for IPv6 GUAs
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Full
’ 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.
3. 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
4. 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
5. Match the situation with the appropriate use of network
media.

6. 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
Explanation: Throughput usually does not match the
specified bandwidth of physical links due to multiple
factors. These factors include, the amount of traffic, type
of traffic, and latency created by the network devices the
data has to cross.
7. 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.
Explanation: Fiber-optic cabling supports higher
bandwidth than UTP for longer distances. Fiber is

immune to EMT and RFI, but costs more, requires more
skill to install, and requires more safety precautions.
8. 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
Explanation: The OSI physical layer provides the means
to transport the bits that make up a frame across the
network media. This layer accepts a complete frame
from the data link layer and encodes it as a series of
signals that are transmitted to the local media.
9. 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
Explanation: Crosstalk is a type of noise, or interference
that occurs when signal transmission on one wire
interferes with another wire. When current flows through
a wire a magnetic field is produced. The produced
magnetic field will interface the signal earned in the
adjacent wire.
10. Refer to the graphic. What type of cabling is shown?

STP
UTP
coax
fiber
Explanation: Network cabling include different types of
cables:
UTP cable consists of four pairs of color-coded wires
that have been twisted together and then encased in
a flexible plastic sheath.
STP cable uses four pairs of wires, each wrapped in
a foil shield, which are then wrapped in an overall
metallic braid or foil.
Coaxial cable uses a copper conductor and a layer
of flexible plastic insulation surrounds the copper
conductor.
Fiber cable is a flexible, extremely thin, transparent
strand of glass surrounded by plastic insulation.
11. 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

Explanation: Copper media is widely used in network
communications. However, copper media is limited by
distance and signal interference. Data is transmitted on
copper cables as electrical pulses. The electrical pulses
are susceptible to interference from two sources:
Electromagnetic interference (EMI) or radio
frequency interference (RFI) - EMI and RFI
signals can distort and corrupt the data signals being
carried by copper media.
Crosstalk - Crosstalk is a disturbance caused by
the electric or magnetic fields of a signal on one wire
interfering with the signal in an adjacent wire.
12. Refer to the graphic. What type of cabling is shown?
STP
UTP
coax
fiber
13. Which two devices commonly affect wireless
networks? (Choose two.)
Blu-ray players
home theaters
cordless phones
microwaves
incandescent light bulbs
external hard drives

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Explanation: Radio Frequency Interference (RFI) is the
interference that is caused by radio transmitters and
other devices that are transmitting in the same
frequency.
14. 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.
Explanation: The data link layer is divided into two sub
layers, namely Logical Link Control (LLC) and Media
Access Control (MAC). LLC forms a frame from the
network layer PDU into a format that conforms to the
requirements of the network interface and media. A
network layer PDU might be for IPv4 or IPv6. The MAC
sub layer defines the media access processes performed
by the hardware. It manages the frame access to the
network media according to the physical signaling
requirements (copper cable, fiber optic, wireless, etc.)
15. 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

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to compute the checksum header for the data field in the
frame
Explanation: The CRC value in the FCS field of the
received frame is compared to the computed CRC value
of that frame, in order to verify the integrity of the frame.
If the two values do not match, then the frame is
discarded.
16. What is contained in the trailer of a data-link frame?
logical address
physical address
data
error detection
Explanation: The trailer in a data-link frame contains
error detection information that is pertinent to the frame
included in the FCS field. The header contains control
information, such as the addressing, while the area that
is indicated by the word "data" includes the data,
transport layer PDU, and the IP header.
17. 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.
Explanation: All data link layer protocols encapsulate
the Layer 3 PDU within the data field of the frame.
However, the structure of the frame and the fields that
are contained in the header vary according to the

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protocol. Different data link layer protocols may use
different fields, like priority/quality of service, logical
connection control, physical link control, flow control, and
congestion control.
18. 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
Explanation: Partial mesh topologies provide high
availability by interconnecting multiple remote sites, but
do not require a connection between all remote sites. A
mesh topology requires point-to-point links with every
system being connected to every other system. A point-
to-point topology is where each device is connected to
one other device. A hub and spoke uses a central device
in a star topology that connects to other point-to-point
devices.
19. 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
Explanation: An Ethernet frame is not processed and is
discarded if it is smaller than the minimum (64 bytes) or if

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the calculated frame check sequence (FCS) value does
not match the received FCS value. Auto-MDIX
(automatic medium-dependent interface crossover) is
Layer 1 technology that detects cable straight-through or
crossover types. The source MAC address is not used to
determine how the frame is received. CEF (Cisco
Express Forwarding) is a technology used to expedite
Layer 3 switching.
20. Which media communication type does not require
media arbitration in the data link layer?
deterministic
half-duplex
full-duplex
controlled access
Explanation: Half-duplex communication occurs when
both devices can both transmit and receive on the
medium but cannot do so simultaneously. Full-duplex
communication occurs when both devices can transmit
and receive on the medium at the same time and
therefore does not require media arbitration. Half-duplex
communication is typically contention-based, whereas
controlled (deterministic) access is applied in
technologies where devices take turns to access the
medium.
21. 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.

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CCNA 1 v7 Modules 4 to 7 Ethernet Concepts Exam An

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