Computer Networks UNIT - II (NOISE)

Which of the following best defines noise?

• a) Unwanted or undesirable sound

• b) Pleasant and soothing sound

• c) Silence

• d) Musical tones

What is the unit used to measure noise?

• a) Decibel (dB)

• b) Hertz (Hz)

• c) Watt (W)

• d) Ohm (Ω)

Which of the following factors can introduce noise in a wired network?

• a) Electromagnetic interference (EMI)

• b) Crosstalk between cables

• c) Signal attenuation

• d) All of the above

Which type of noise is caused by electrical devices or power lines close to the network cables?

• a) Thermal noise interference (EMI)

• b) Crosstalk noise

• c) Impulse noise

• d) Electromagnetic

What is the term for the measure of signal strength compared to the level of background noise in a network?

• a) Signal-to-noise ratio (SNR)

• b) Data transfer rate

• c) Network latency

• d) Packet loss rate

Which of the following can help reduce noise in a wired network?

• a) Twisted pair cables

• b) Shielded cables

• c) Fiber optic cables

• d) All of the above

9. Which type of noise is caused by random electrical fluctuations in the transmission medium?

• 9. a) Impulse noise

• 9. b) Crosstalk noise

• 9. c) Thermal noise

• 9. d) Propagation delay noise

What can be used to mitigate the effects of impulse noise in a network?

• a) Error detection and correction techniques

• b) Signal amplification

• c) Encryption algorithms

• d) Load balancing algorithms

What is the term for noise that occurs when signals from adjacent cables interfere with each other?

• a) Crosstalk noise

• b) Thermal noise

• c) Impulse noise

• d) Attenuation noise

Which network component is responsible for converting analog signals to digital signals and vice versa to reduce noise?

• a) Router

• b) Modem

• c) Switch

• d) Firewall