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What is the standard unit for measuring signal power in networking equipment?
a. dBm
b. VA
c. Ohms
d. dB
Answer: a. dBmtestbook+1
Which IEEE standard defines the first generation of Power over Ethernet (PoE)?
a. 802.3ac
b. 802.3af
c. 802.11ac
d. 802.1Q
Answer: b. 802.3afa1securitycameras+1
The maximum output power allowed for a PoE Class 0 device at the Powered Device (PD) is:
a. 5 W
b. 7 W
c. 12.95 W
d. 25 W
Answer: c. 12.95 Whowtonetwork+1
Which power class allows the highest power output in IEEE 802.3at (PoE+)?
a. Class 0
b. Class 2
c. Class 3
d. Class 4
Answer: d. Class 4a1securitycameras+1
What is the typical voltage range for PoE power transmission?
a. 5–12 V
b. 12–24 V
c. 44–57 V
d. 110–220 V
Answer: c. 44–57 Vhowtonetwork+1
What does a negative dB value indicate in networking signal measurements?
a. Power gain
b. Power loss
c. Noise immunity
d. Voltage drop
Answer: b. Power lossexamradar+1
Which device type receives power from PoE?
a. Power Sourcing Equipment
b. Powered Device
c. PoE Splitter
d. UPS
Answer: b. Powered Deviceipcisco+1
The maximum power delivered by an 802.3af Power Sourcing Equipment (PSE) per port is:
a. 7.0 W
b. 12.95 W
c. 15.4 W
d. 25.5 W
Answer: c. 15.4 Wa1securitycameras+1
IEEE 802.3bt “Type 4” PoE is capable of delivering up to how many watts per port?
a. 30
b. 51
c. 60
d. 90
Answer: d. 90netgear+1
The loss of signal strength over a network cable is known as:
a. Reflection
b. Attenuation
c. Amplification
d. Distortion
Answer: b. Attenuationtestbook+1
A typical Cat 5e Ethernet cable can support PoE up to:
a. 50 m
b. 100 m
c. 150 m
d. 300 m
Answer: b. 100 mnetgear+1
Which PoE class is intended for devices needing 4.0 W or less?
a. Class 1
b. Class 2
c. Class 3
d. Class 0
Answer: a. Class 1howtonetwork+1
The physical layer of the OSI model is responsible for:
a. Encryption
b. Power delivery
c. Framing
d. TCP management
Answer: b. Power deliveryexamradar+1
Power delivered to a device is reduced over long cable distances due to:
a. Spikes
b. Voltage drop
c. Interference
d. DC offset
Answer: b. Voltage dropnetgear+1
dBm is measurement referenced to:
a. 0.1 watt
b. 1 watt
c. 1 milliwatt
d. 10 milliwatts
Answer: c. 1 milliwatttestbook+1
What is the power delivered at the PD in an 802.3af setup?
a. 4.0 W
b. 7.0 W
c. 12.95 W
d. 15.4 W
Answer: c. 12.95 Wa1securitycameras+1
A Class 3 PoE device requires a maximum of:
a. 12.95 W
b. 7.0 W
c. 6.49 W
d. 25.5 W
Answer: a. 12.95 Whowtonetwork+1
Which PoE standard first introduced support for 30 W power delivery?
a. 802.3af
b. 802.3at
c. 802.3ac
d. 802.3ba
Answer: b. 802.3ata1securitycameras+1
A decibel (dB) is a:
a. Linear measurement
b. Logarithmic unit
c. Power unit
d. Voltage scaler
Answer: b. Logarithmic unitexamradar+1
Using two wire pairs for PoE delivery is supported in:
a. 802.3af
b. 802.3at
c. Both a and b
d. Neither
Answer: c. Both a and bhowtonetwork+1
Signal attenuation typically increases with:
a. Lower cable gauge
b. Higher cable length
c. Lower frequency
d. Lower voltage
Answer: b. Higher cable lengthexamradar+1
The output power of a wireless access point is restricted to meet:
a. Proprietary limitations
b. Regulatory and safety requirements
c. User preferences
d. Device branding
Answer: b. Regulatory and safety requirementsscribd+1
Maximum power draw for PoE Type 2 (802.3at) at the PD is:
a. 7.0 W
b. 12.95 W
c. 25.5 W
d. 51 W
Answer: c. 25.5 Wa1securitycameras+1
A device requiring 23 W of power must at minimum support:
a. 802.3af
b. 802.3at
c. 802.3bt
d. 802.11af
Answer: b. 802.3atnetgear+1
Which of the following best describes ‘insertion loss’?
a. Cable break
b. Reduction in signal strength over a connection
c. Voltage increase
d. Return loss
Answer: b. Reduction in signal strength over a connectiontestbook+1
Which type of cable is most recommended for High PoE?
a. Cat 5
b. Cat 5e
c. Cat 6
d. Cat 3
Answer: c. Cat 6netgear+1
Maximum number of wire pairs used in PoE++ (IEEE 802.3bt) transmission:
a. 2
b. 3
c. 4
d. 8
Answer: c. 4howtonetwork+1
The IEEE 802.3af standard operates within what voltage range at the PD?
a. 3.3–5 V
b. 5–24 V
c. 37–57 V
d. 110–220 V
Answer: c. 37–57 Va1securitycameras+1
Power level negotiations between PSE and PD occur during:
a. Shutdown
b. Power-up sequence
c. Data framing
d. Application layer
Answer: b. Power-up sequenceipcisco+1
Which regulatory domain may enforce maximum wireless AP power limits?
a. FCC
b. ITU
c. IEEE
d. ISO
Answer: a. FCCscribd+1
In networking, power over cable is generally delivered using:
a. DC voltage
b. AC voltage
c. Modulated sine wave
d. Pulse code modulation
Answer: a. DC voltagenetgear+1
dBm = 10 × log10(Power/1mW) is used for:
a. Voltage measurement
b. Power measurement
c. Frequency measurement
d. Time interval
Answer: b. Power measurementtestbook+1
Which of the following can receive up to 90W under 802.3bt “Type 4” PoE?
a. PTZ IP Camera
b. Building Lighting
c. Video Phone
d. Simple IP Phone
Answer: b. Building Lightingnetgear+1
How many PoE device classes are defined in the IEEE 802.3af standard?
a. 2
b. 3
c. 4
d. 5
Answer: c. 4planetechusa+1
Signal strength is commonly measured in:
a. Mbps
b. Watts
c. dBm
d. GHz
Answer: c. dBmexamradar+1
Which attack could exploit high PoE power settings to disable PDs?
a. Power overrun
b. Power starvation
c. Overcurrent attack
d. Brownout
Answer: c. Overcurrent attackipcisco+1
Power Sourcing Equipment (PSE) includes:
a. Ethernet cameras
b. Switches and injectors
c. Wireless clients
d. Fiber converters
Answer: b. Switches and injectorsipcisco+1
Maximum power dissipation in Ethernet cable occurs due to:
a. Electromagnetic interference
b. Cable resistance
c. Power negotiation failures
d. Protocol errors
Answer: b. Cable resistancea1securitycameras+1
The minimum power category required for PoE+ (802.3at) is:
a. Cat 3
b. Cat 4
c. Cat 5
d. Cat 6
Answer: c. Cat 5netgear+1
In the context of RF signals, higher power levels typically:
a. Increase range
b. Reduce noise
c. Decrease coverage
d. Lower SNR
Answer: a. Increase rangescribd+1
The minimum power the PSE must deliver for IEEE 802.3at Class 4:
a. 15.4 W
b. 25.5 W
c. 30 W
d. 60 W
Answer: c. 30 Whowtonetwork+1
The total system power loss in cable is calculated as:
a. I × R
b. V × I
c. I² × R
d. P × V
Answer: c. I² × Rtestbook+1
Which PoE class typically powers VoIP phones?
a. Class 1
b. Class 2
c. Class 3
d. Class 4
Answer: c. Class 3a1securitycameras+1
What physical layer property directly affects signal power loss?
a. Cable color
b. Cable length
c. Number of users
d. Network protocol
Answer: b. Cable lengthexamradar+1
Which method is used by switches to detect PoE devices?
a. CDP
b. LLDP
c. Signature detection
d. DHCP
Answer: c. Signature detectionipcisco+1
What is the maximum supported power at the PD for High PoE (non-standard)?
a. 15.4 W
b. 30 W
c. 51 W
d. 60 W
Answer: c. 51 Wnetgear+1
Class 2 PoE can deliver a maximum of:
a. 3.84 W
b. 6.49 W
c. 12.95 W
d. 25.5 W
Answer: b. 6.49 Whowtonetwork+1
The ratio of output power to input power, expressed in dB, is called:
a. Gain
b. Attenuation
c. Return loss
d. Reflection
Answer: a. Gaintestbook+1
Power budgeting is important in a network to:
a. Save bandwidth
b. Reduce PoE switches
c. Prevent overloading PSE
d. Increase frequency
Answer: c. Prevent overloading PSEhowtonetwork+1
An 802.3bt PSE can supply power on:
a. One pair
b. Two pairs
c. Four pairs
d. Six pairs
Answer: c. Four pairsa1securitycameras+1

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