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CCNA 1 v7 Modules 4 - 7 : Ethernet Concepts Exam Answers
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Introduction to Networks (Version 7.00) - Modules 4 - 7: Ethernet
Concepts Exam
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.
• 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 groun ding conn ecti ons
• 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.

CCbiA 1 v7 Modules 4 - 7 : Ethernet Concepts Exam Answers - Exams Cisco
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 conn ecti on to th e Inlernet
■ 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 combin es the technique of can celIation, s hi el ding, a nd twisting to prote ct 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 EMI 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 front 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 carried in
the adjacent wire
10. Refer to the graphic. What type of cabling is shown?
■ STP
i 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 witti the signal in an adjacent wire.
12. Refer to the graphic. What type of cabling is shown?
. STP
. UTP
coax.

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

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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
• to compute the checksum header for the data field in the frame
16. What is contained in the trailer of a data-link frame?
. logical address
« physical address
■ data
« error detection
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 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

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partial mesh
hub and spoke
point-to-point
Translate »
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
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.

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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.
. All end and intermediate devices are connected in a chain to each other.
Explanation: In an extended star topology., central intermediate devices interconnect other
star topologies.
22. 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
23. 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.

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CCNA 1 v7 Modules 4 7 Ethernet Concepts Exam

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