Page 1 of 44
HARDWARE AND OPERATING SYSTEMS ESSENTIALS:
D386 -STUDY GUIDE ( 100 ) QUESTIONS WITH RADICLE
RATIONALES
IT & Cybersecurity
Exam coverage:
I. Section 1 (Q1–35): CPU, chipsets, memory types,
processors, hypervisors, containers, topologies, and
network devices.
II. Section 2 (Q36–60): DDR channels, RAID, SSD vs. HDD,
wear leveling, file systems, ROM, ECC, dual-channel, and
open-source OS.
III. Section 3 (Q61–80): Hypervisors, containers, cloud
models (IaaS/PaaS), elasticity, zero clients, OS categories,
and IDE tools.
IV. Section 4 (Q81–100): Malware types, botnets, security
protocols, NFRs (security, reliability, usability), VRF,
firewalls, gateways, and WAN/MAN.
SECTION 1: COMPUTER ARCHITECTURE AND SYSTEM
COMPONENTS (Questions 1–35)
1. Which set of components make up the central processing
unit (CPU)?
• A. Control unit and cache memory
• B. Arithmetic logic unit (ALU) and control unit (CU)
• C. Registers and memory management unit
• D. Clock and bus interface
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• CORRECT: B. RATIONALE: The CPU consists of the
Arithmetic Logic Unit (ALU), which performs arithmetic and
logical operations, and the Control Unit (CU), which
decodes instructions and directs data flow. Other
components like cache, registers, and the memory
management unit support CPU function but are not the
core components.
2. Which motherboard component is used for support of
slower onboard peripherals?
• A. Northbridge
• B. CPU socket
• C. Southbridge
• D. PCIe slot
• CORRECT: C. RATIONALE: The Southbridge chipset
handles input/output functions for slower peripherals like
USB ports, SATA connections, audio, and legacy devices.
The Northbridge manages high-speed communication
between CPU, RAM, and GPU and is now often integrated
into the CPU itself.
3. What size data path do today's DIMMs use?
• A. 32-bit
• B. 64-bit
• C. 128-bit
• D. 256-bit
• CORRECT: B. RATIONALE: Modern DIMMs (Dual In-line
Memory Modules) use a 64-bit data path, which matches
the width of modern CPU data buses. Earlier SIMMs used
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32-bit data paths. This allows efficient data transfer
between RAM and the processor.
4. Which type of DRAM do modern laptops use?
• A. DIMM
• B. SO-DIMM
• C. RIMM
• D. SIMM
• CORRECT: B. RATIONALE: SO-DIMM (Small Outline DIMM)
is the smaller form factor of memory module designed for
laptops and other portable devices due to space
constraints. Desktop computers use standard DIMMs,
which are physically larger.
5. Which memory type is characterized by its independence
from the CPU's external clock?
• A. Synchronous DRAM
• B. DDR4 SDRAM
• C. Asynchronous DRAM
• D. EDO RAM
• CORRECT: C. RATIONALE: Asynchronous DRAM operates
independently of the CPU's system clock. It does not
synchronize its operations with the processor's clock
signal, which can lead to timing mismatches and reduced
performance compared to synchronous DRAM.
6. Which memory type shares a common clock signal with
the computer's system-bus clock?
• A. Asynchronous DRAM
• B. Synchronous DRAM (SDRAM)
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• C. EDO RAM
• D. FPM DRAM
• CORRECT: B. RATIONALE: SDRAM synchronizes its
operations with the system bus clock, allowing it to accept
new commands on every clock cycle. This synchronization
improves performance compared to asynchronous DRAM
by eliminating timing mismatches between memory and
CPU.
7. Which memory type is stored on a drive and is referred to
as a paging file?
• A. RAM
• B. Virtual RAM
• C. Cache memory
• D. ROM
• CORRECT: B. RATIONALE: Virtual RAM (paging file or swap
space) uses a portion of the hard drive or SSD to simulate
additional RAM. When physical RAM is full, the OS moves
less frequently used data to the paging file. This is slower
than physical RAM but allows the system to run more
applications than physical memory would permit.
8. Which type of processor memory is located on the
processor itself?
• A. Level 1 cache
• B. Level 2 cache
• C. Level 3 cache
• D. Virtual memory
• CORRECT: A. RATIONALE: Level 1 (L1) cache is memory
on the processor die itself, used as a cache to improve
HARDWARE AND OPERATING SYSTEMS ESSENTIALS:
D386 -STUDY GUIDE ( 100 ) QUESTIONS WITH RADICLE
RATIONALES
IT & Cybersecurity
Exam coverage:
I. Section 1 (Q1–35): CPU, chipsets, memory types,
processors, hypervisors, containers, topologies, and
network devices.
II. Section 2 (Q36–60): DDR channels, RAID, SSD vs. HDD,
wear leveling, file systems, ROM, ECC, dual-channel, and
open-source OS.
III. Section 3 (Q61–80): Hypervisors, containers, cloud
models (IaaS/PaaS), elasticity, zero clients, OS categories,
and IDE tools.
IV. Section 4 (Q81–100): Malware types, botnets, security
protocols, NFRs (security, reliability, usability), VRF,
firewalls, gateways, and WAN/MAN.
SECTION 1: COMPUTER ARCHITECTURE AND SYSTEM
COMPONENTS (Questions 1–35)
1. Which set of components make up the central processing
unit (CPU)?
• A. Control unit and cache memory
• B. Arithmetic logic unit (ALU) and control unit (CU)
• C. Registers and memory management unit
• D. Clock and bus interface
, Page 2 of 44
• CORRECT: B. RATIONALE: The CPU consists of the
Arithmetic Logic Unit (ALU), which performs arithmetic and
logical operations, and the Control Unit (CU), which
decodes instructions and directs data flow. Other
components like cache, registers, and the memory
management unit support CPU function but are not the
core components.
2. Which motherboard component is used for support of
slower onboard peripherals?
• A. Northbridge
• B. CPU socket
• C. Southbridge
• D. PCIe slot
• CORRECT: C. RATIONALE: The Southbridge chipset
handles input/output functions for slower peripherals like
USB ports, SATA connections, audio, and legacy devices.
The Northbridge manages high-speed communication
between CPU, RAM, and GPU and is now often integrated
into the CPU itself.
3. What size data path do today's DIMMs use?
• A. 32-bit
• B. 64-bit
• C. 128-bit
• D. 256-bit
• CORRECT: B. RATIONALE: Modern DIMMs (Dual In-line
Memory Modules) use a 64-bit data path, which matches
the width of modern CPU data buses. Earlier SIMMs used
, Page 3 of 44
32-bit data paths. This allows efficient data transfer
between RAM and the processor.
4. Which type of DRAM do modern laptops use?
• A. DIMM
• B. SO-DIMM
• C. RIMM
• D. SIMM
• CORRECT: B. RATIONALE: SO-DIMM (Small Outline DIMM)
is the smaller form factor of memory module designed for
laptops and other portable devices due to space
constraints. Desktop computers use standard DIMMs,
which are physically larger.
5. Which memory type is characterized by its independence
from the CPU's external clock?
• A. Synchronous DRAM
• B. DDR4 SDRAM
• C. Asynchronous DRAM
• D. EDO RAM
• CORRECT: C. RATIONALE: Asynchronous DRAM operates
independently of the CPU's system clock. It does not
synchronize its operations with the processor's clock
signal, which can lead to timing mismatches and reduced
performance compared to synchronous DRAM.
6. Which memory type shares a common clock signal with
the computer's system-bus clock?
• A. Asynchronous DRAM
• B. Synchronous DRAM (SDRAM)
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• C. EDO RAM
• D. FPM DRAM
• CORRECT: B. RATIONALE: SDRAM synchronizes its
operations with the system bus clock, allowing it to accept
new commands on every clock cycle. This synchronization
improves performance compared to asynchronous DRAM
by eliminating timing mismatches between memory and
CPU.
7. Which memory type is stored on a drive and is referred to
as a paging file?
• A. RAM
• B. Virtual RAM
• C. Cache memory
• D. ROM
• CORRECT: B. RATIONALE: Virtual RAM (paging file or swap
space) uses a portion of the hard drive or SSD to simulate
additional RAM. When physical RAM is full, the OS moves
less frequently used data to the paging file. This is slower
than physical RAM but allows the system to run more
applications than physical memory would permit.
8. Which type of processor memory is located on the
processor itself?
• A. Level 1 cache
• B. Level 2 cache
• C. Level 3 cache
• D. Virtual memory
• CORRECT: A. RATIONALE: Level 1 (L1) cache is memory
on the processor die itself, used as a cache to improve
