WGU C393 IT Foundations Exam 2026
Questions and Answers
frontside bus - Correct answer-Signal pathway for communication between CPU
and memory
backside bus - Correct answer-Signal pathway between CPU and L2 or L3 cache
frontside bus - Correct answer-Where cache is placed if no backside bus exists
ATX - Correct answer-Largest motherboard form factor, puts the processor and
memory in line with the fan output of the power supply, allowing the processor to
run cooler
micro ATX - Correct answer-Follows the ATX principle of component placement
for enhanced cooling but with a smaller footprint, fits into ATX cases
ITX - Correct answer-Family of small motherboard form factors with mini-, nano-,
pico-, and mobile- categories.
Southbridge - Correct answer-This is in charge of anything other than CPU,
memory and cache, and PCIe
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,SODIMM and MicroDIMM - Correct answer-Form factors for laptop memory
L1 cache - Correct answer-Term for cache memory built into the processor
L2 cache - Correct answer-Term for cache memory external to the processor,
possibly physically close by
L3 cache - Correct answer-Term for cache memory on the motherboard, when the
processor already has external cache
firmware - Correct answer-The name given to any software that is encoded in
hardware, usually on ROM, and run without extra instructions from the operating
system
option ROMs - Correct answer-Another term for things like the SCSI BIOS and
video BIOS
Parity checking - Correct answer-A rudimentary memory error-checking scheme
that offers no error correction
1 - Correct answer-How many bits can ECC memory correct?
single-sided memory - Correct answer-Memory modules with chips on just one
side
double-sided memory - Correct answer-Memory modules with chips on both sides,
which the memory controller must switch between
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, buffered or registered memory modules - Correct answer-These memory modules
include specialized chips that act as buffers for all signals from the memory
controller, except, in some cases, the data signals
Load-reduced DIMMs - Correct answer-A form of registered DIMMs that increase
performance by maintaining parallel communication
onboard - Correct answer-Term for connectors included on the motherboard
off board - Correct answer-Term for connectors not on the motherboard, but
residing on adapter cards
drive interface - Correct answer-Name for the connector on the motherboard or
adapter card that connects via cable to the hard drive
3m - Correct answer-Max cable length of USB 1
5m - Correct answer-Max cable length of USB 2
3m - Correct answer-Max cable length of USB 3
(hub count * max cable length) + max cable length - Correct answer-Formula for
calculating max USB cable length with hubs
127 - Correct answer-Max number of USB devices per host
4.5m - Correct answer-Max FireWire 400 cable length
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
Questions and Answers
frontside bus - Correct answer-Signal pathway for communication between CPU
and memory
backside bus - Correct answer-Signal pathway between CPU and L2 or L3 cache
frontside bus - Correct answer-Where cache is placed if no backside bus exists
ATX - Correct answer-Largest motherboard form factor, puts the processor and
memory in line with the fan output of the power supply, allowing the processor to
run cooler
micro ATX - Correct answer-Follows the ATX principle of component placement
for enhanced cooling but with a smaller footprint, fits into ATX cases
ITX - Correct answer-Family of small motherboard form factors with mini-, nano-,
pico-, and mobile- categories.
Southbridge - Correct answer-This is in charge of anything other than CPU,
memory and cache, and PCIe
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,SODIMM and MicroDIMM - Correct answer-Form factors for laptop memory
L1 cache - Correct answer-Term for cache memory built into the processor
L2 cache - Correct answer-Term for cache memory external to the processor,
possibly physically close by
L3 cache - Correct answer-Term for cache memory on the motherboard, when the
processor already has external cache
firmware - Correct answer-The name given to any software that is encoded in
hardware, usually on ROM, and run without extra instructions from the operating
system
option ROMs - Correct answer-Another term for things like the SCSI BIOS and
video BIOS
Parity checking - Correct answer-A rudimentary memory error-checking scheme
that offers no error correction
1 - Correct answer-How many bits can ECC memory correct?
single-sided memory - Correct answer-Memory modules with chips on just one
side
double-sided memory - Correct answer-Memory modules with chips on both sides,
which the memory controller must switch between
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
, buffered or registered memory modules - Correct answer-These memory modules
include specialized chips that act as buffers for all signals from the memory
controller, except, in some cases, the data signals
Load-reduced DIMMs - Correct answer-A form of registered DIMMs that increase
performance by maintaining parallel communication
onboard - Correct answer-Term for connectors included on the motherboard
off board - Correct answer-Term for connectors not on the motherboard, but
residing on adapter cards
drive interface - Correct answer-Name for the connector on the motherboard or
adapter card that connects via cable to the hard drive
3m - Correct answer-Max cable length of USB 1
5m - Correct answer-Max cable length of USB 2
3m - Correct answer-Max cable length of USB 3
(hub count * max cable length) + max cable length - Correct answer-Formula for
calculating max USB cable length with hubs
127 - Correct answer-Max number of USB devices per host
4.5m - Correct answer-Max FireWire 400 cable length
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
