Introduction: Your Exam Reference Guide

This chapter is a reference compendium designed for last-minute exam preparation. It consolidates critical terminology, timeline milestones, commonly confused concepts, and exam traps from all previous chapters.

Use this chapter:

• During preparation: Memorize acronyms and timelines
• Day before exam: Verify you know all acronyms and major milestones
• After each chapter: Review relevant sections

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Section 1: Master Acronym List (100+ Terms)

Hardware Acronyms

Acronym	Full Form	Meaning	Context
CPU	Central Processing Unit	Brain of computer; executes instructions	Measured in GHz
RAM	Random Access Memory	Temporary, fast memory; volatile (loses data on shutdown)	8GB, 16GB typical
ROM	Read-Only Memory	Permanent memory; non-volatile; can't erase or modify	BIOS stored in ROM
SSD	Solid State Drive	Fast storage using flash memory; no moving parts	~500 MB/s read speed
HDD	Hard Disk Drive	Slower storage with spinning magnetic disk	Cheaper but slower than SSD
GPU	Graphics Processing Unit	Specialized processor for graphics/parallel computation	Mining, AI, gaming
USB	Universal Serial Bus	Standard port for connecting peripherals	USB-A, USB-C types
HDMI	High-Definition Multimedia Interface	Cable for video/audio transmission	Monitor, TV connection
BIOS	Basic Input/Output System	Firmware that initializes hardware before OS loads	Pre-boot menu: Delete key
UEFI	Unified Extensible Firmware Interface	Modern replacement for BIOS	Better security, GUI
CMOS	Complementary Metal-Oxide-Semiconductor	Chip storing BIOS settings; powered by coin battery	Cleared to reset BIOS
NAND	NAND Flash Memory	Non-volatile storage technology (SSDs, USB drives, phones)	Data persists without power
MHz	Megahertz	Million clock cycles per second; CPU speed unit	Older: MHz; modern: GHz
GHz	Gigahertz	Billion clock cycles per second	2.4 GHz CPU = 2.4 billion cycles/sec
TB	Terabyte	1 trillion bytes (~1000 GB)	Hard drive capacity
GB	Gigabyte	1 billion bytes (~1000 MB)	RAM capacity, file sizes
MB	Megabyte	1 million bytes (~1000 KB)	Small file sizes
KB	Kilobyte	1000 bytes	Text file sizes

Memory Hook: "RAM = Temporary (RAM-bunctious, quick but forgetful); ROM = Permanent (Roman statues, lasting)"

Network & Internet Acronyms

Acronym	Full Form	Meaning	Context
TCP	Transmission Control Protocol	Reliable data transmission with error checking	Guarantees delivery order
UDP	User Datagram Protocol	Fast but unreliable transmission	Video streaming, online gaming
IP	Internet Protocol	Addresses and routing packets across networks	IPv4 (32-bit), IPv6 (128-bit)
DNS	Domain Name System	Translates domain names to IP addresses	example.com → 142.250.185.46
URL	Uniform Resource Locator	Web address identifying resource location	https://www.example.com/path
HTTP	HyperText Transfer Protocol	Protocol for transferring web pages (unsecured)	Port 80
HTTPS	HTTP Secure	HTTP with SSL/TLS encryption	Port 443; padlock icon
FTP	File Transfer Protocol	Protocol for uploading/downloading files	Port 21; insecure
SFTP	SSH File Transfer Protocol	Secure FTP (encrypted)	Recommended over FTP
SMTP	Simple Mail Transfer Protocol	Sending emails to server	Port 25 (or 587)
POP3	Post Office Protocol 3	Receiving emails (destructive; deletes from server)	Port 110
IMAP	Internet Message Access Protocol	Receiving emails (non-destructive; stays on server)	Port 143; modern standard
ISP	Internet Service Provider	Company providing internet connectivity	Jio, Airtel (India); Comcast, Verizon (US)
VPN	Virtual Private Network	Encrypted tunnel for privacy and security	Creates secure connection
SSL	Secure Sockets Layer	Encryption protocol for HTTPS	Older term; replaced by TLS
TLS	Transport Layer Security	Modern replacement for SSL	Secures HTTPS connections
DDoS	Distributed Denial of Service	Attack overwhelming server with fake requests	Makes service unavailable
2FA	Two-Factor Authentication	Second verification (OTP, biometric) after password	Greatly improves security
VR	Virtual Reality	Complete immersion in digital environment	Headsets, games
AR	Augmented Reality	Digital overlays on real world	Pokemon Go, Snapchat filters
RFID	Radio-Frequency Identification	Wireless technology tracking objects	Passports, payment cards
IoT	Internet of Things	Connected devices sharing data	Smartwatch, smart home
3D	Three-Dimensional	3D printing, 3D modeling, 3D displays	Depth in all three axes

Memory Hook: "HTTP = Insecure web; HTTPS = Secure web (S = Secure)"

Software & Programming Acronyms

Acronym	Full Form	Meaning	Context
OS	Operating System	System software managing hardware (Windows, Linux, macOS)	Core software layer
API	Application Programming Interface	Rules for software communication	Allows apps to talk to each other
SDK	Software Development Kit	Tools for developing software	Includes libraries, compiler, debugger
IDE	Integrated Development Environment	Complete coding environment	Visual Studio, VS Code, PyCharm
GUI	Graphical User Interface	Visual interface with icons/menus	Point-and-click (vs. CLI)
CLI	Command-Line Interface	Text-based interface (typing commands)	Terminal, PowerShell
HTML	HyperText Markup Language	Markup language for web pages (structure)	, , tags
CSS	Cascading Style Sheets	Language for styling HTML (appearance)	Colors, fonts, spacing
JS	JavaScript	Programming language for web interactivity	Runs in browsers; now also servers (Node.js)
JSON	JavaScript Object Notation	Lightweight data format (human-readable)	APIs, config files
XML	Extensible Markup Language	Data format with custom tags	More verbose than JSON
SQL	Structured Query Language	Language for querying databases	SELECT, INSERT, UPDATE, DELETE
CSV	Comma-Separated Values	Simple data format (spreadsheets)	One row per line
AJAX	Asynchronous JavaScript and XML	Fetch data without reloading page	Modern web apps
CMS	Content Management System	Software for managing website content	WordPress, Drupal
ERP	Enterprise Resource Planning	Software integrating business operations	SAP, Oracle ERP
CRM	Customer Relationship Management	Software managing customer interactions	Salesforce, HubSpot
AI	Artificial Intelligence	Machines performing intelligent tasks	Broad umbrella term
ML	Machine Learning	Learning from data (subset of AI)	Training data improves performance
DL	Deep Learning	Neural networks with multiple layers (subset of ML)	Breakthrough in image/language recognition
NLP	Natural Language Processing	Computers understanding human language	ChatGPT, Google Translate
LLM	Large Language Model	Neural networks trained on massive text	ChatGPT, Bard, Claude
RNN	Recurrent Neural Network	Neural network for sequence data	Text generation, translation
CNN	Convolutional Neural Network	Neural network for image recognition	Computer vision
GIT	Version Control System	Tracks code changes	GitHub, GitLab
SSH	Secure Shell	Secure remote access protocol	Linux servers, secure login
PAT	Personal Access Token	Authentication token (GitHub, APIs)	Alternative to passwords

Memory Hook: "HTML = Skeleton (structure); CSS = Clothes (appearance); JS = Brain (behavior)"

Security & Database Acronyms

Acronym	Full Form	Meaning	Context
SPF	Sender Policy Framework	Prevents email spoofing	DNS record
DKIM	DomainKeys Identified Mail	Digitally signs emails	Verifies authenticity
DMARC	Domain-based Message Authentication, Reporting, Conformance	Email authentication policy	Combines SPF + DKIM
ACL	Access Control List	Defines who can access what	File permissions
PKI	Public Key Infrastructure	System for managing encryption keys	Digital certificates
CA	Certificate Authority	Issues digital certificates	Verisign, Comodo, Let's Encrypt
ACID	Atomicity, Consistency, Isolation, Durability	Database transaction guarantees	Relational databases
RDBMS	Relational Database Management System	Software managing relational databases	MySQL, PostgreSQL, Oracle
NoSQL	Not Only SQL	Non-relational databases	MongoDB, Cassandra
ETL	Extract, Transform, Load	Data pipeline process	Business intelligence

Cloud & Architecture Acronyms

Acronym	Full Form	Meaning	Context
IaaS	Infrastructure as a Service	Cloud providing VMs/storage	AWS EC2, Google Compute Engine
PaaS	Platform as a Service	Cloud providing development platform	Heroku, Firebase
SaaS	Software as a Service	Cloud providing applications	Google Workspace, Salesforce
AWS	Amazon Web Services	Largest cloud provider (~32% share)	EC2, S3, RDS services
GCP	Google Cloud Platform	Google's cloud (~11% share)	BigQuery, Dataflow
RTO	Recovery Time Objective	How long to restore service after disaster	Target: 2 hours
RPO	Recovery Point Objective	Max acceptable data loss	Target: 1 hour
SLA	Service Level Agreement	Uptime guarantee	99.9% = 43 min/month downtime
CDN	Content Delivery Network	Delivers content from nearest server	CloudFlare, Akamai

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Section 2: Timeline of Computing Milestones

Organized chronologically from 1940s to 2024—essential for exam prep:

1940s-1950s: The Computer Birth

Year	Event	Significance
1946	ENIAC (Electronic Numerical Integrator and Computer) completed	First general-purpose electronic computer; weighed 30 tons; used 18,000 vacuum tubes
1947	Transistor invented at Bell Labs	Replaced vacuum tubes; smaller, faster, more reliable
1956	Dartmouth Conference	Birth of Artificial Intelligence; researchers optimistic about AI

1960s-1970s: Networks & Protocols

Year	Event	Significance
1969	ARPANET launched	Precursor to Internet; first message sent UCLA → Stanford
1972	Email invented	Ray Tomlinson sends first network email
1974	Microprocessors proliferate	Intel 4004, Apple II begins era of personal computers
1977	Apple II released	First personal computer for mass market

1980s: Personal Computers Boom

Year	Event	Significance
1980	IBM PC released	Established PC standard; widespread adoption
1981	MS-DOS 1.0 released	Operating system for IBM PC
1984	Apple Macintosh released	First GUI (Graphical User Interface) for consumers
1985	Windows 1.0 released	Microsoft's GUI for IBM PCs
1985	C++ programming language created	Object-oriented extension of C

1990s: Internet Goes Mainstream

Year	Event	Significance
1989	World Wide Web invented (Tim Berners-Lee, CERN)	Web revolutionizes information sharing; HTTP, HTML, URLs
1991	Linux kernel released	Linus Torvalds creates free, open-source OS
1991	Windows 3.0 released	Mature GUI; drives Windows adoption
1991	Python created	Emphasis on readability; becomes data science favorite
1995	JavaScript created	Brendan Eich creates language for web interactivity (10 days!)
1995	Java released	"Write once, run anywhere"; JVM enables platform independence
1995	Windows 95 released	GUI becomes standard; drives PC adoption
1995	Amazon founded	Pioneering e-commerce
1995	eBay founded	Online auction platform
1998	Google founded	Revolutionizes search with PageRank algorithm

2000s: Mobile & Social Era Begins

Year	Event	Significance
2001	Wikipedia launched	Free, crowdsourced encyclopedia (disrupted Britannica)
2003	MySpace launches	Social networking pioneer
2003	WordPress released	Content management system; powers ~43% of websites today
2004	Facebook launched	Social network becomes dominant platform
2005	YouTube launched	Video sharing; revolutionizes content consumption
2006	Twitter launched	Microblogging; 500M+ users

2007-2010: Mobile Revolution

Year	Event	Significance
2007	iPhone released (Steve Jobs)	Revolutionizes mobile; capacitive touchscreen, intuitive OS
2008	Android released	Open-source mobile OS; dominates market share
2008	Bitcoin whitepaper published	"Satoshi Nakamoto" introduces blockchain cryptocurrency
2009	Bitcoin network launches	First blockchain implementation live
2010	iPad released	Tablets become viable computing device

2010s: AI & Cloud Expansion

Year	Event	Significance
2011	IBM Watson wins Jeopardy!	AI defeats champion in language-based game
2012	Deep Learning Renaissance	Geoffrey Hinton's team wins ImageNet competition dramatically
2016	AlphaGo defeats Lee Sedol	DeepMind AI beats world champion in Go using deep learning
2017	Transformer Architecture (Attention Is All You Need)	Breakthrough enabling modern LLMs
2017	WannaCry ransomware attacks	Largest cyberattack wave; hospitals affected

2020s: AI Explosion & Multimodal Era

Year	Event	Significance
2020	COVID-19 accelerates cloud/remote work	Zoom, Google Meet become essential
2022	ChatGPT released (Nov 30)	Reaches 100M users in 2 months; fastest software adoption ever
2023	GPT-4 released (Mar)	Multimodal (text + images); passes bar exam
2023	Google Bard launched (Dec)	Competes with ChatGPT
2023	LLM explosion	Copilot, Gemini, Claude 2, Llama 2 released
2024	Multimodal AI standard	Text, image, video understanding in single models

Memory Hook:

• 1969 = ARPANET (Internet born)
• 1989 = Web (Tim Berners-Lee)
• 1995 = JavaScript, Java, Windows 95, Amazon, eBay, Google founding year (1998)
• 2007 = iPhone (mobile revolution)
• 2022 = ChatGPT (AI mainstream)

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Section 3: Commonly Confused Concepts (8 Critical Distinctions)

1. Internet vs. Intranet vs. Web

Aspect	Internet	Intranet	Web (WWW)
Scope	Global, public network	Private, organizational network	Service on Internet using HTTP/HTTPS
Access	Anyone with connection	Only organization employees	Anyone accessing web pages
Technology	TCP/IP protocols	TCP/IP (same as Internet)	HTTP, HTML, URLs
Example	The worldwide network	Company internal network	Google.com, Wikipedia
Exam Tip	"Internet = global; Intranet = private; Web = one service on Internet"

2. RAM vs. ROM

Aspect	RAM	ROM
Volatility	Volatile (loses data on shutdown)	Non-volatile (retains data)
Speed	Very fast (~10 nanoseconds)	Slower
Capacity	Typically 8-32 GB	Typically 256 KB - 4 MB
Purpose	Temporary workspace for running programs	Firmware (BIOS), bootloader
Write	Can read/write (temporary changes)	Read-only (can't modify)
Cost	Expensive	Cheap
Exam Trap	Question: "What happens when you turn off computer?" Answer: RAM loses data; ROM keeps data

3. HTTP vs. HTTPS

Aspect	HTTP	HTTPS
Encryption	None (plain text)	Encrypted (SSL/TLS)
Security	Low (anyone can intercept)	High (encrypted)
Port	80	443
Visual	No padlock	Padlock icon in browser
Usage	Static content only	Login, payments, sensitive data
Exam Trap	"Never enter passwords on http:// site"

4. Hardware vs. Software

Aspect	Hardware	Software
Nature	Physical, tangible	Intangible, instructions
Drop on foot	Hurts!	No physical damage
Examples	CPU, RAM, keyboard, monitor	Windows, Photoshop, Chrome
Lifespan	Years (degrades over time)	Indefinite (doesn't wear out)
Exam Tip	"Hardware = Physical; Software = Programs"

5. AI vs. Machine Learning

Aspect	AI	Machine Learning
Scope	Umbrella (broad)	Subset of AI (specific)
Method	Various (rules, learning, etc.)	Learns from data
Learning	Doesn't always learn	Always learns from data
Example	Chess engine using tables	Spam detector learning from emails
Hierarchy	AI ⊃ ML ⊃ DL	ML is part of AI
Exam Trap	"Is all AI machine learning?" Answer: NO

6. Compiled vs. Interpreted Languages

Aspect	Compiled	Interpreted
Process	Entire code → Machine code → Run	Line-by-line conversion at runtime
Speed	Faster (pre-compiled)	Slower (runtime interpretation)
Development	Slower (must recompile after change)	Faster (write, run immediately)
Errors	Caught at compile time	Caught at runtime
Platform	Platform-specific binaries	Platform-independent (if interpreter available)
Examples	C, C++, Go	Python, JavaScript, PHP
Exam Tip	Speed matters? Compiled. Flexibility matters? Interpreted.

7. Virus vs. Malware

Aspect	Virus	Malware
Scope	Specific type of malware	Umbrella (includes virus, worm, trojan, etc.)
Replication	Yes (copies itself to files)	May or may not replicate
Host	Requires host file to replicate	Some don't need host (worms)
Example	Attaches to .exe files	Trojan, ransomware, spyware all malware
Exam Trap	"All viruses are malware; not all malware is virus"

8. Authentication vs. Authorization

Aspect	Authentication	Authorization
Definition	Proving who you are	Granting what you can do
Question	"Are you who you claim?"	"What are you allowed to do?"
Method	Password, fingerprint, 2FA	Access control, permissions
Example	Login to Gmail	Gmail user can read emails but not access admin settings
Order	Happens first	Happens after authentication
Exam Tip	"Authentication = Identity; Authorization = Permissions"

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Section 4: Exam Traps & Red Flags

Trap 1: Confusing Internet and Web

Question: "Which is older, the Internet or the Web?" Trap Answer: "They're the same thing" → WRONG Correct Answer: "Internet (ARPANET, 1969) is 20 years older than Web (1989)"

Trap 2: Port Number Confusion

Question: "What's the default port for HTTPS?" Trap Answer: "80" (HTTP default) → WRONG Correct Answer: "443"

Trap 3: SQL Injection Misconception

Question: "How to prevent SQL injection?" Trap Answer: "Use firewalls only" → WRONG Correct Answer: "Use parameterized queries"

Trap 4: Blockchain ≠ Bitcoin

Question: "What's blockchain's primary use?" Trap Answer: "Only cryptocurrency (Bitcoin)" → WRONG Correct Answer: "Supply chain, smart contracts, voting, etc.; Bitcoin is just one application"

Trap 5: Cloud Uptime Misconception

Question: "Does cloud guarantee 100% uptime?" Trap Answer: "Yes" → WRONG Correct Answer: "No; typical SLAs are 99.9%, 99.99% (not 100%)"

Trap 6: Open-Source ≠ Free

Question: "Are all open-source programs free?" Trap Answer: "Yes" → Mostly true but misleading Correct Answer: "Open-source = source code available; often free but not always; Freeware = free but source not available"

Trap 7: Compiled Faster Than Interpreted

Question: "Why is C faster than Python?" Trap Answer: "C is more powerful" → WRONG Correct Answer: "C compiles to machine code; Python is interpreted (slower execution); C's speed is due to compilation model"

Trap 8: Data Loss Myths

Question: "Backup in cloud prevents all data loss?" Trap Answer: "Yes" → WRONG Correct Answer: "Cloud backup helps but 3-2-1 rule better (3 copies, 2 media types, 1 off-site)"

Trap 9: Encryption Solves Everything

Question: "Does encryption prevent all cyberattacks?" Trap Answer: "Yes" → WRONG Correct Answer: "Encryption protects data in transit/storage; doesn't prevent phishing, malware in email"

Trap 10: 2FA Guarantees Security

Question: "Is 2FA completely secure?" Trap Answer: "Yes" → WRONG Correct Answer: "2FA greatly improves security but doesn't guarantee it; social engineering can bypass 2FA"

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Section 5: Last-Minute Memorization Checklist

Acronyms You MUST Know (27 Critical)

1. CPU, RAM, ROM, SSD, HDD → Hardware
2. TCP, IP, DNS, URL, HTTP, HTTPS → Networking
3. SMTP, POP3, IMAP → Email
4. HTML, CSS, JS → Web
5. SQL, NoSQL → Databases
6. AI, ML, DL → Artificial Intelligence
7. IaaS, PaaS, SaaS → Cloud
8. VPN, 2FA, DDoS → Security
9. Git, API, SDK → Development
10. IoT, VR, AR → Emerging tech

Timeline You MUST Know (15 Key Dates)

1. 1969 = ARPANET
2. 1989 = World Wide Web (Tim Berners-Lee)
3. 1998 = Google founded
4. 2004 = Facebook launched
5. 2007 = iPhone released (mobile revolution)
6. 2008 = Bitcoin whitepaper
7. 2016 = AlphaGo defeats Lee Sedol
8. 2022 = ChatGPT released (Nov 30)
9. 1995 = JavaScript, Java, Windows 95
10. 2001 = Wikipedia

Confused Pairs You MUST Distinguish (8 Pairs)

1. Internet vs. Web = Global network vs. one service
2. RAM vs. ROM = Temporary/fast vs. permanent/slow
3. HTTP vs. HTTPS = Unencrypted vs. encrypted
4. Hardware vs. Software = Physical vs. instructions
5. AI vs. ML = Umbrella vs. subset
6. Compiled vs. Interpreted = Pre-conversion vs. runtime
7. Virus vs. Malware = Specific vs. umbrella
8. Authentication vs. Authorization = Identity vs. permissions

Numbers to Remember (Memory Hooks)

• IPv4: 4 numbers, each 0-255
• IPv6: 128 bits (vs. IPv4's 32)
• Ports: 80 (HTTP), 443 (HTTPS), 25 (SMTP), 110 (POP3), 143 (IMAP)
• ChatGPT: 100M users in 2 months
• Dartmouth: 1956 (AI birth)
• Cloud: IaaS > PaaS > SaaS (Most control → Least control)

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Section 6: Pre-Exam Confidence Checks

Day Before Exam: 30-Minute Power Review

First 5 minutes: Random 5 acronyms and define them

• Example: ACID, SSH, CDN, RPO, SFTP

Next 5 minutes: Timeline quiz (name the year)

• When did AlphaGo beat Lee Sedol? → 2016
• When was ChatGPT released? → Nov 2022
• When was ARPANET launched? → 1969

Next 10 minutes: Confused pairs disambiguation

• "Is email part of Internet or Web?" → Internet
• "Is ML part of AI or vice versa?" → ML is part of AI
• "What's faster: RAM or ROM?" → RAM

Last 10 minutes: Exam traps

• "Can viruses spread without host files?" → Some can (worms)
• "Is open-source always free?" → Usually yes, but not always
• "Can blockchain reverse transactions?" → No; immutable

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Section 7: Master Reference Table (Exam Quick-Lookup)

Operating Systems Quick Reference

OS	Creator	Launch	Market	Strength
Windows	Microsoft	1985	~74%	Business, gaming
macOS	Apple	1984	~15%	Designers, professionals
Linux	Linus Torvalds	1991	~2% desktop; huge server	Free, open-source
Android	Google	2008	~70% mobile	Mobile devices
iOS	Apple	2007	~27% mobile	iPhones, iPads

Programming Languages Quick Reference

Language	Year	Type	Best For	Difficulty
Python	1991	Interpreted	AI, data science, scripting	Easy
JavaScript	1995	Interpreted	Web frontend/backend	Easy
Java	1995	Compiled (bytecode)	Enterprise, Android	Medium
C	1972	Compiled	OS, embedded, performance	Hard
Go	2009	Compiled	Concurrency, microservices	Medium

Database Quick Reference

Type	Structured	ACID	Scalability	Use Case	Example
Relational (SQL)	Yes	Yes	Medium	Business data	MySQL, PostgreSQL
NoSQL	No	No (eventual)	High	Web apps, IoT	MongoDB, Cassandra

Cloud Providers Quick Reference

Provider	Market Share	Strength	Best For
AWS	~32% (largest)	Widest services	Enterprises, startups
Azure	~23%	Windows integration	Microsoft shops
GCP	~11%	Data/AI	Data science, ML

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Section 8: Final Exam Tips

During the Exam

60-Second Strategy:

1. Read question completely (don't rush)
2. Identify key terms (look for traps)
3. Check if multiple definitions apply (pick most specific)
4. Review answers (A, B, C, D) for logical flow

Red Flag Questions:

• "Which of the following is NOT..." → Tricky; read carefully
• "Which BEST describes..." → May have multiple correct answers; pick most complete
• Acronym questions → Check if acronym fully expanded correctly

Last-Minute Guess Strategy:

• Networking/Security questions? Check port numbers (likely option)
• Timeline questions? Think about order (earlier vs. recent)
• Confusion questions? Pick option emphasizing distinction

Common Wrong Answer Patterns

Trap Pattern 1: "Uses old term"

• Question about SSL → Answer says "TLS" (more modern; both acceptable)
• Eliminate answers using obsolete terminology

Trap Pattern 2: "Opposite of correct"

• Question: "What's volatile?"
• Trap: "ROM" (non-volatile; opposite)
• Correct: "RAM" (volatile)

Trap Pattern 3: "Partial truth"

• Question: "SQL prevents all attacks?"
• Trap: "Yes, SQL is secure"
• Correct: "Parameterized queries prevent SQL injection"

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Section 9: Formula-Based Answer Keys (Systematic Approach)

For "Which is fastest?" Questions

Fastest to Slowest:

1. CPU registers (nanoseconds)
2. L1/L2/L3 cache (nanoseconds to microseconds)
3. RAM (nanoseconds)
4. SSD (microseconds)
5. HDD (milliseconds)
6. Internet (milliseconds to seconds)

For "Which is more secure?" Questions

More Secure:

1. 2FA > 1FA (two factors > one)
2. HTTPS > HTTP (encrypted > plain)
3. VPN > No VPN (encrypted tunnel > open)
4. Parameterized queries > Direct queries (prevents injection)
5. Hashed password > Plain password (irreversible > readable)

For "Which is more scalable?" Questions

More Scalable:

1. NoSQL > Relational (distributed > single server)
2. Microservices > Monolith (independent > monolithic)
3. Cloud > On-premises (elastic > fixed)
4. Distributed > Centralized (spread out > concentrated)

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Final Exam Revision Checklist

Complete this 1 hour before exam:

• Can I define 20 acronyms from acronym list?
• Can I name 10 tech milestones in order?
• Can I distinguish all 8 confused pairs?
• Do I know port numbers: 80, 443, 25, 110, 143?
• Can I explain HTTPS security (SSL/TLS)?
• Can I distinguish SQL/NoSQL databases?
• Do I understand cloud models: IaaS > PaaS > SaaS?
• Can I list 5 SQL operations: CREATE, SELECT, INSERT, UPDATE, DELETE?
• Do I know AI timeline: 1956 (Dartmouth), 2016 (AlphaGo), 2022 (ChatGPT)?
• Can I explain blockchain: distributed, immutable, transparent?
• Do I understand IoT examples: smartwatch, smart home, smart city?
• Can I distinguish virus vs. worm vs. trojan vs. ransomware?
• Do I know authentication vs. authorization difference?
• Can I name 3 cloud providers and their main strength?
• Do I understand SDLC phases: requirements → design → dev → testing → deploy → maintain?

If YES to 14/15: You're ready. If NO to 3+: Review those sections.

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MCQs (23 Questions)

1. ARPANET was launched in:

• A) 1972
• B) 1969
• C) 1989
• D) 1995

2. The World Wide Web was invented by:

• A) Vint Cerf and Bob Kahn
• B) Tim Berners-Lee in 1989
• C) Jonathan Postel
• D) Robert Metcalfe

3. Which technology was invented first?

• A) Internet (ARPANET)
• B) World Wide Web
• C) Email
• D) TCP/IP protocol

4. ChatGPT reached 100 million users in approximately:

• A) 6 months
• B) 3 months
• C) 2 months
• D) 1 month

5. The default port for HTTPS is:

• A) 80
• B) 110
• C) 143
• D) 443

6. The default port for SMTP is:

• A) 25
• B) 110
• C) 143
• D) 443

7. IPv4 uses how many bits for addressing?

• A) 16 bits
• B) 32 bits
• C) 64 bits
• D) 128 bits

8. IPv6 uses how many bits for addressing?

• A) 32 bits
• B) 64 bits
• C) 128 bits
• D) 256 bits

9. RAM differs from ROM in that RAM is:

• A) Non-volatile like ROM
• B) Volatile (loses data on shutdown)
• C) Permanent storage
• D) Never used for temporary data

10. AlphaGo defeated world champion Lee Sedol in:

• A) 2014
• B) 2015
• C) 2016
• D) 2017

11. Which language was created first?

• A) Python (1991)
• B) Java (1995)
• C) C++ (1985)
• D) JavaScript (1995)

12. The Dartmouth Conference (birth of AI) was held in:

• A) 1952
• B) 1956
• C) 1960
• D) 1964

13. Facebook was launched in:

• A) 2003
• B) 2004
• C) 2005
• D) 2006

14. The iPhone was released in:

• A) 2005
• B) 2006
• C) 2007
• D) 2008

15. Linux kernel was released by:

• A) Dennis Ritchie
• B) Bill Gates
• C) Linus Torvalds
• D) Tim Berners-Lee

16. GitHub was founded in:

• A) 2005
• B) 2006
• C) 2008
• D) 2010

17. Cloud computing models ranked by control (most to least) are:

• A) SaaS, PaaS, IaaS
• B) IaaS, PaaS, SaaS
• C) PaaS, IaaS, SaaS
• D) SaaS, IaaS, PaaS

18. Which is NOT part of the TCP/IP suite?

• A) TCP
• B) IP
• C) HTTP
• D) DNS

19. Which email protocol sends emails?

• A) IMAP
• B) POP3
• C) SMTP
• D) HTTP

20. Blockchain technology is characterized by being:

• A) Centralized
• B) Mutable (changeable)
• C) Transparent and immutable
• D) Requires trusted authority

21. The 3-2-1 backup rule means:

• A) 3 backups per day, 2 automatic, 1 manual
• B) 3 copies of data, 2 storage types, 1 off-site location
• C) 3 hours backup interval, 2 sites, 1 cloud
• D) 3 servers, 2 backups, 1 database

22. Which of the following is a relational database?

• A) MongoDB
• B) Cassandra
• C) PostgreSQL
• D) Redis

23. AI, ML, and DL relationship is:

• A) Three separate, unrelated concepts
• B) All the same thing
• C) AI contains ML; ML contains DL
• D) ML is bigger than AI

Answer Key: 1-B, 2-B, 3-A, 4-C, 5-D, 6-A, 7-B, 8-C, 9-B, 10-C, 11-C, 12-B, 13-B, 14-C, 15-C, 16-C, 17-B, 18-C, 19-C, 20-C, 21-B, 22-C, 23-C