40 Questions
What is goodput?
The measure of usable data transferred over a given period of time
What is the purpose of the Physical Layer in a network?
Establishing a physical connection to a local network
Which factor influences throughput?
Type of traffic
What is a limitation of copper cabling?
Limited by distance
Which layer does the Physical Layer occupy on the OSI model?
Physical Layer
In what ways can data be transmitted over a network?
Physically wired or through radio waves
What does crosstalk refer to?
Disturbance caused by electric or magnetic fields
How is goodput different from throughput?
Goodput is the usable data transferred over a given period of time
What type of device connects other devices to a wireless network?
Wireless Access Point (AP)
What is the most common type of cabling used in networks today?
Copper Cabling
What is the responsibility of the Physical Layer regarding Data Link Layer frames?
Encoding frames into signals for transmission
How does the Physical Layer transport data frames across the network media?
Using electric signals
What is a factor that can distort and corrupt data signals in copper cabling?
Attenuation
What is the primary role of a Network Interface Card (NIC) in a network?
Connecting a device to the network
How does goodput relate to traffic overhead?
Subtracts overhead from throughput
Why must a physical connection to a local network be established before network communications?
So data can be represented and transmitted
What is the purpose of encoding in the physical layer?
To convert the stream of bits into a format recognizable by the next device
Which encoding method represents a high-to-low voltage transition as a 0 bit?
Manchester encoding
What is the purpose of signaling in the physical layer?
To generate electrical, optical, or wireless signals representing 1s and 0s
Which Ethernet standard uses 8B/10B encoding?
1000BASE-T
In which encoding method does the transition occur at the middle of each bit period?
Manchester encoding
Which statement best describes codes in the context of encoding?
Codes provide a predictable pattern recognizable by sender and receiver
What does the signaling method determine in the physical layer?
The representation of 1s and 0s on the physical medium
Which characteristic is NOT associated with the encoding process in the physical layer?
Encrypting the data for secure transmission
What is a method used by some copper cables to mitigate crosstalk?
Twisting opposing circuit pair wires together
What is a characteristic of fiber-optic cables that makes them less susceptible to signal loss?
Their low dispersion
What is a typical application of single-mode fiber?
Long-distance, high-bandwidth connections
What is a disadvantage of multimode fiber compared to single-mode fiber?
It has greater dispersion
What is the maximum cable distance for multimode fiber?
550 meters
What is a common use case for fiber-optic cabling?
Connecting buildings in a campus
What is a benefit of fiber-optic cabling compared to copper cabling?
It transmits data over longer distances at higher bandwidth
What is the purpose of the fiber-optic cable acting as a waveguide or light pipe?
To transmit light pulses
What is a key advantage of fiberoptic cables over copper cabling?
Immunity to electrical hazards
Which cable type is best suited for relatively long distances?
Fiberoptic cabling
What factor makes wireless media susceptible to interference?
Dependence on radio or microwave frequencies
Which feature of WLANs can lead to reduced bandwidth for each user?
Operation in half-duplex mode
What is an important characteristic of fiberoptic cabling for data transmission?
Immunity to interference
Which factor distinguishes fiberoptic cabling from UTP cabling regarding distance limitations?
Relatively short distances for UTP cabling
What makes fiberoptic cabling safer than UTP cabling in terms of electrical hazards?
High immunity to electrical hazards
Why is wireless media considered highly mobile?
Usage of radio or microwave frequencies
Learn about the purpose and importance of the Physical Layer in computer networking, its role in establishing the physical connection for data transfer, and its position in the OSI and TCP/IP models.
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