Showing posts with label Computer Generations. Show all posts
Showing posts with label Computer Generations. Show all posts

Wednesday, July 22, 2026

G.C.E. A/L ICT Exam Solutions Part II | G12-ICT-TM-FWC-P2 Hardware, Networks & OS Complete step-by-step solutions for A/L ICT Part II. Covers Computer Generations, Network Topology, TCP/UDP, Virtual Memory, Paging, and FAT with exam tips

🎓 G.C.E. A/L ICT Exam Solutions (Part II)

Hardware, Networks, Operating Systems & Step-by-Step Calculations

📚 About this guide: Complete, step-by-step solutions for G.C.E. Advanced Level ICT Part II structured questions. Covers Computer Evolution, Network Topology, TCP/UDP, Virtual Memory, Paging, and File Allocation Table (FAT) with clear formulas, diagrams, and exam-oriented memory tricks.
Q1✅ (5) John Presper Eckert

Principal Inventor of ENIAC

Theory: ENIAC was the world's first general-purpose electronic digital computer, designed by John Presper Eckert and John W. Mauchly.

🎯 Exam Memory Trick:
ENIAC → Eckert & Mauchly
Stored Program → Von Neumann
Analytical Engine → Charles Babbage
First Programmer → Ada Lovelace
Q2✅ (3) Integrated Circuits

Third Generation Computers

Theory: 1st Gen = Vacuum Tubes, 2nd Gen = Transistors, 3rd Gen = Integrated Circuits (IC), 4th Gen = VLSI/Microprocessors, 5th Gen = AI.

Q3✅ (4) Flash Memory & ROM

Non-Volatile Memory

Theory: Non-volatile memory retains data when power is off. RAM, Cache, and Registers are volatile. Flash and ROM are non-volatile.

Q4✅ (2) RAM

Outside the Microprocessor

Theory: ALU, Control Unit, Registers, and Cache are inside the microprocessor. RAM, Hard Disks, and SSDs are outside (external memory).

Q5✅ (5) Store BIOS program

NOT a typical use of RAM

Theory: RAM is temporary and volatile, used for running programs and temporary data. The BIOS program is permanent and must be stored in non-volatile ROM.

Q2(v)✅ Network Diagram

ABC Company Network Design

Theory: 4 Departments (D01-D04) each need a Switch. All switches connect to a central Router. The Router connects to a Firewall, which connects to the Internet. Proxy and DNS servers sit in the ICT Services (D04) department.

                        Internet
                            │
                      +-------------+
                      |  Firewall   |
                      +-------------+
                            │
                      +-------------+
                      |   Router    |
                      +-------------+
          ┌────────────┼─────────────┬─────────────┐
     +---------+  +---------+  +---------+  +---------+
     | Switch  |  | Switch  |  | Switch  |  | Switch  |
     +---------+  +---------+  +---------+  +---------+
          │            │             │             │
     Accounts      Sales      Admin      ICT Services
      (D01)        (D02)        (D03)        (D04)
                                              │
                         ┌────────────────────┴───────────────┐
                  +---------------+                  +---------------+
                  | Proxy Server  |                  |  DNS Server   |
                  +---------------+                  +---------------+
Q2(vi)✅ TCP vs UDP

Differences Between TCP and UDP

FeatureTCPUDP
ReliabilityReliable (checks delivery)Unreliable (no checks)
ConnectionConnection-orientedConnectionless
SpeedSlower (error checking)Faster (no overhead)
ExamplesHTTP, Email, FTPVideo Streaming, VoIP, DNS
🎯 Exam Memory Trick:
TCP = Trustworthy (Reliable, slower)
UDP = Ultra Fast (Unreliable, faster)
Q3(a)✅ 4 bits & 12 bits

Page Number & Offset Bits

Given: 16-bit Virtual Address, Page Size = 4 KB.

Step 1 (Offset): 4 KB = 4096 Bytes = 2¹². Therefore, Offset = 12 bits.

Step 2 (Page Number): 16 total bits - 12 offset bits = 4 bits.

+------------+----------------+
| Page Number|     Offset     |
|   4 bits   |    12 bits     |
+------------+----------------+
Q3(b)(i)✅ 24788

Physical Address Calculation

Given: Virtual Address = 12500.

Step 1: Page Number = 12500 ÷ 4096 = 3 (Remainder/Offset = 212).

Step 2: Page Table shows Page 3 is in Frame 6 (110₂).

Step 3: Physical Address = (Frame × Page Size) + Offset = (6 × 4096) + 212 = 24788.

Q3(b)(ii-iv)

Paging Concepts

  • Why a page is absent: 1) Not loaded into RAM yet. 2) Swapped out to disk due to full RAM.
  • Advantages of Paging: Eliminates external fragmentation; supports virtual memory (running programs larger than physical RAM).
  • Hardware for mapping: Memory Management Unit (MMU) inside the CPU.
Q3(c)(i)✅ Block 503

First Block of promax.py

Theory: Trace the chain backwards. The first block is the one not pointed to by any other block.

Chain: 503 → 501 → 500 → 502 → -1 (End).

Q3(c)(ii)✅ 16 KB

Disk Space Occupied

Theory: The file uses 4 blocks (503, 501, 500, 502). Each block is 4 KB.

Calculation: 4 blocks × 4 KB = 16 KB.

Q3(c)(iii)✅ Updated FAT

File Grows to 20 KB

Theory: Needs 1 more block (20 KB - 16 KB = 4 KB). The free block is 504.

Action: Change block 502's pointer from -1 to 504. Change block 504's pointer to -1.

Block   Next Block
500     502
501     500
502     504  ← Updated
503     501
504     -1   ← Updated (End)

Quick Answer Key

QAnswerTopic
15ENIAC (Eckert & Mauchly)
233rd Gen = Integrated Circuits
34Non-Volatile = Flash & ROM
42RAM is outside Microprocessor
55BIOS is stored in ROM, not RAM
2vDiagramRouter → Firewall → Internet
2viTableTCP (Reliable/Slow) vs UDP (Fast)
3a4 & 12Page Number & Offset bits
3bi24788Physical Address Calculation
3bivMMUHardware for address mapping
3ci503First FAT Block
3cii16 KBFile Size (4 blocks × 4KB)
⭐ Most Important A/L ICT Topics to Master:
🖥️ Computer Generations & Logic Gates (Half/Full Adder)
🧮 Number Systems & Binary Arithmetic
🌐 IP Addressing, CIDR, VLSM, and Network Devices
🧠 Operating Systems: Process States, Virtual Memory, Paging, FAT
🛠️ SDLC, Software Testing, and Feasibility Studies

❓ Frequently Asked Questions (FAQ)

Q: Who invented ENIAC and what was its significance? A: ENIAC (Electronic Numerical Integrator and Computer) was the world's first general-purpose electronic digital computer, designed by John Presper Eckert and John W. Mauchly.
Q: What is the difference between TCP and UDP? A: TCP is connection-oriented, reliable, and performs error checking (making it slower), ideal for web browsing and emails. UDP is connectionless, unreliable, and faster, making it ideal for video streaming and online gaming.
Q: How do you calculate Page Number and Offset bits in Virtual Memory? A: First, convert the Page Size to bytes and express it as a power of 2 (e.g., 4KB = 2^12). The exponent (12) is the Offset bits. Subtract this from the total Virtual Address bits to get the Page Number bits.
Q: What hardware component translates virtual addresses to physical addresses? A: The Memory Management Unit (MMU), which is a hardware component inside the CPU, performs address mapping from virtual addresses to physical addresses using the page table.
Q: How do you find the first block of a file in a File Allocation Table (FAT)? A: The first block (directory entry) is the block number that is not pointed to as the "Next Block" by any other block in the FAT chain.

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