[Chapter 8 Quiz] Comp 20173 Data Communication And Networking
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Chapter 8: OSI Physical Layer
- 1.
What is the purpose of encoding?
- A.
To identify the start and stop bits in a frame
- B.
To denote the physical layer’s connectors of computers in relation to the way they connect to network media
- C.
To control the way frames are placed on the media at the data link layer
- D.
To represent the data bits by using different voltages, light patterns, or electromagnetic waves as they are placed onto the physical media
Correct Answer
D. To represent the data bits by using different voltages, light patterns, or electromagnetic waves as they are placed onto the physical mediaExplanation
Encoding is the process of converting data into a format that can be transmitted or stored. In the context of this question, the purpose of encoding is to represent the data bits using different voltages, light patterns, or electromagnetic waves as they are placed onto the physical media. This allows for the transmission of data over various types of media, such as electrical signals over copper wires or light signals over fiber optic cables. By using different encoding schemes, the data can be effectively transmitted and received by the receiving device.Rate this question:
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- 2.
What best describes the purpose of the physical layer?
- A.
Ensures reliable transmission of data across a physical link
- B.
Determines connectivity and path selection between two end systems
- C.
Establishes the physical addressing, networking topology, and media access
- D.
Defines the functional specifications for links between end systems and the electrical, optical, and radio signals
Correct Answer
D. Defines the functional specifications for links between end systems and the electrical, optical, and radio signalsExplanation
The purpose of the physical layer is to define the functional specifications for links between end systems and the electrical, optical, and radio signals. This means that it is responsible for determining how data is transmitted over physical links, including the type of signals used and the specifications for the physical media. It is not responsible for ensuring reliable transmission of data, determining connectivity and path selection, or establishing physical addressing and networking topology.Rate this question:
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- 3.
Through what process does UTP cable help to avoid crosstalk?
- A.
Shielding of cable
- B.
Twisting of pairs
- C.
Grounding the endpoints
- D.
Cladding in cable
Correct Answer
B. Twisting of pairsExplanation
UTP (Unshielded Twisted Pair) cable helps to avoid crosstalk through the process of twisting the pairs of wires. By twisting the pairs, the electromagnetic interference (EMI) and crosstalk between adjacent wires are reduced. This twisting technique helps to cancel out the interference and maintain signal integrity, ensuring reliable data transmission. Shielding of the cable, grounding the endpoints, and cladding in the cable are not directly related to avoiding crosstalk in UTP cables.Rate this question:
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- 4.
What is the purpose of cladding in fiber-optic cables?
- A.
Cable grounding
- B.
Noise cancellation
- C.
Prevention of light loss
- D.
EMI protection
Correct Answer
C. Prevention of light lossExplanation
The purpose of cladding in fiber-optic cables is to prevent light loss. Cladding is a layer of material that surrounds the core of the fiber-optic cable. It has a lower refractive index than the core, which allows the light signals to be reflected back into the core and continue along the cable without significant loss. This prevents the light signals from dissipating or weakening as they travel through the cable, ensuring efficient transmission of data.Rate this question:
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- 5.
Which of the following measures the actual data transfer rate over a medium?
- A.
Bandwidth
- B.
Throughput
- C.
Goodput
- D.
None of these
Correct Answer
B. ThroughputExplanation
Throughput is the measure of the actual data transfer rate over a medium. It represents the amount of data that can be transmitted in a given time period. Bandwidth, on the other hand, refers to the maximum capacity of a medium to transmit data. Goodput is the measure of the useful data transfer rate, excluding any overhead or error correction data. Therefore, the correct answer is Throughput as it specifically measures the actual data transfer rate.Rate this question:
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- 6.
It is a configuration type of twisted pair cable that is used in local area networks to connect a computer to a network hub such as router.
- A.
Straight-Through
- B.
Crossover
- C.
Rollover
- D.
Option 4
Correct Answer
A. Straight-ThroughExplanation
A straight-through cable is used to connect a computer to a network hub, such as a router, in a local area network. This type of cable has the same wiring arrangement on both ends, where the wires are connected in the same order. This allows for the proper transmission of data between the computer and the network hub.Rate this question:
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- 7.
How many wires do twisted pair cable with RJ45 adapter have?
- A.
4 wires
- B.
8 wires
- C.
6 wires
- D.
10 wires
Correct Answer
B. 8 wiresExplanation
Twisted pair cable with an RJ45 adapter has 8 wires. The RJ45 connector is commonly used for Ethernet connections, and it requires 8 wires to transmit data. These wires are arranged in pairs, with each pair twisted together to reduce interference and crosstalk. The 8 wires are divided into 4 pairs, with each pair used for transmitting and receiving signals. This configuration allows for faster and more reliable data transmission over the twisted pair cable.Rate this question:
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- 8.
The gigabit ethernet has a speed of 1 Gbps. What is the equivalent of 1Gbps in Mbps?
- A.
1 Mbps
- B.
10 Mbps
- C.
100 Mbps
- D.
None of these
Correct Answer
D. None of theseExplanation
The correct answer is "None of these" because 1 Gbps is equivalent to 1000 Mbps, not 1 Mbps, 10 Mbps, or 100 Mbps.Rate this question:
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- 9.
It is a type of Ethernet cable used to connect computing devices together directly. It is most often used to connect two devices of the same type: e.g. two computers (via network interface controller) or two switches to each other
- A.
Straight-Through
- B.
Crossover
- C.
Rollover
- D.
None of these
Correct Answer
B. CrossoverExplanation
A crossover cable is a type of Ethernet cable that is used to directly connect two computing devices together. It is commonly used to connect devices of the same type, such as two computers or two switches, to each other. Unlike a straight-through cable, which is used to connect different types of devices, a crossover cable has its transmit and receive wires crossed over, allowing for direct communication between the devices. This type of cable is often used in peer-to-peer networking scenarios.Rate this question:
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- 10.
In gaming or real time application, a low bandwidth network will:
- A.
Not affect the application at all
- B.
Make the game or the application to load slower
- C.
Make the game or the application to load faster
- D.
Option 4
Correct Answer
B. Make the game or the application to load slowerExplanation
In gaming or real-time applications, a low bandwidth network will make the game or application load slower. This is because a low bandwidth network has limited capacity to transmit data quickly, resulting in delays and slower loading times for the game or application.Rate this question:
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Current Version
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Feb 03, 2023Quiz Edited by
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Oct 19, 2019Quiz Created by
Homer Santos
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