WGU D413 PROFESSIONAL EXAM
REVIEW WITH TESTED QUESTIONS AND
EXPERT SOLUTIONS
◉ Analog Signals
Answer: Continuous waveforms that vary in amplitude and
frequency. Example: Sound waves.
◉ Digital Signals
Answer: Discrete waveforms that represent data in binary format
(0s and 1s). Example: Data transmitted over the internet.
◉ Baseband Transmission
Answer: Uses the entire bandwidth of the medium to carry a
single data signal. Common in Ethernet networks.
◉ Broadband Transmission
Answer: Carries multiple signals simultaneously by dividing the
bandwidth into channels. Example: Cable TV.
◉ Simplex
Answer: One-way communication (e.g., a keyboard to a
computer).
,◉ Half-Duplex
Answer: Two-way communication, but not simultaneously (e.g.,
walkie-talkies).
◉ Full-Duplex
Answer: Two-way communication simultaneously (e.g., phone
calls).
◉ Direct Current (DC)
Answer: Flows in one direction. Used in low-voltage applications
like batteries.
◉ Alternating Current (AC)
Answer: Changes direction periodically. Used in household
electrical systems.
◉ Electrical Resistance
Answer: Opposes the flow of electrical current. Measured in ohms
(Ω).
◉ Impedance
Answer: Opposition to AC flow, combining resistance and
reactance. Important in signal integrity and cable performance.
◉ Reflected Loss
, Answer: Signal loss due to reflection at the end of a cable. Can
degrade signal quality.
◉ Crosstalk
Answer: Interference caused by adjacent cables. Common in
tightly packed cable bundles.
◉ Ethernet Technologies
Answer: Defines the physical and data link layers of wired
Ethernet.
◉ Auto-MDIX
Answer: Automatically adjusts the transmission and receiving
pins in Ethernet cables, eliminating the need for crossover cables.
◉ Power over Ethernet (PoE)
Answer: Delivers electrical power along with data over Ethernet
cables. Powers devices like IP cameras and wireless access points.
◉ Shorts
Answer: Two wires touching each other, causing a short circuit.
◉ Opens
Answer: Breaks in the wire preventing signal flow.
REVIEW WITH TESTED QUESTIONS AND
EXPERT SOLUTIONS
◉ Analog Signals
Answer: Continuous waveforms that vary in amplitude and
frequency. Example: Sound waves.
◉ Digital Signals
Answer: Discrete waveforms that represent data in binary format
(0s and 1s). Example: Data transmitted over the internet.
◉ Baseband Transmission
Answer: Uses the entire bandwidth of the medium to carry a
single data signal. Common in Ethernet networks.
◉ Broadband Transmission
Answer: Carries multiple signals simultaneously by dividing the
bandwidth into channels. Example: Cable TV.
◉ Simplex
Answer: One-way communication (e.g., a keyboard to a
computer).
,◉ Half-Duplex
Answer: Two-way communication, but not simultaneously (e.g.,
walkie-talkies).
◉ Full-Duplex
Answer: Two-way communication simultaneously (e.g., phone
calls).
◉ Direct Current (DC)
Answer: Flows in one direction. Used in low-voltage applications
like batteries.
◉ Alternating Current (AC)
Answer: Changes direction periodically. Used in household
electrical systems.
◉ Electrical Resistance
Answer: Opposes the flow of electrical current. Measured in ohms
(Ω).
◉ Impedance
Answer: Opposition to AC flow, combining resistance and
reactance. Important in signal integrity and cable performance.
◉ Reflected Loss
, Answer: Signal loss due to reflection at the end of a cable. Can
degrade signal quality.
◉ Crosstalk
Answer: Interference caused by adjacent cables. Common in
tightly packed cable bundles.
◉ Ethernet Technologies
Answer: Defines the physical and data link layers of wired
Ethernet.
◉ Auto-MDIX
Answer: Automatically adjusts the transmission and receiving
pins in Ethernet cables, eliminating the need for crossover cables.
◉ Power over Ethernet (PoE)
Answer: Delivers electrical power along with data over Ethernet
cables. Powers devices like IP cameras and wireless access points.
◉ Shorts
Answer: Two wires touching each other, causing a short circuit.
◉ Opens
Answer: Breaks in the wire preventing signal flow.
