Complete Summary and Solutions for Computer Science Textbook for Class XII Chapter 12: Security Aspects Comprehensive summary and solutions for Chapter 12 'Security Aspects' from the Class XII Computer Science textbook, covering key concepts of data security, threats, cyber crimes, types of attacks and their prevention, authentication, encryption, and network security protocols—along with NCERT exercises and answers. Updated: 8 months ago
Categories: NCERT, Class XII, Computer Science, Chapter 12, Security Aspects, Data Security, Cybersecurity, Threats, Prevention, Summary, Questions, Answers, Programming, Comprehension
Tags: Security Aspects, Data Security, Cybercrime, Attacks, Authentication, Encryption, Network Security, NCERT, Class 12, Computer Science, Summary, Explanation, Questions, Answers, Programming, Chapter 12
Security Aspects - Class 12 Computer Science Chapter 12 Ultimate Study Guide 2025
Full Chapter Summary & Detailed Notes
Key Definitions & Terms
60+ Questions & Answers
Key Concepts
Examples & Figures
Interactive Quiz (10 Q)
Quick Revision Notes & Mnemonics
Key Terms & Processes
Security Processes Step-by-Step
Full Chapter Summary & Detailed Notes - Security Aspects Class 12 NCERT
Overview & Key Concepts
Chapter Goal : Understand threats (malware, hackers, network), prevention (antivirus, firewall, HTTPS). Exam Focus: Malware types, antivirus methods, hackers, DoS; 2025 Updates: Emphasis on ransomware, keyloggers. Fun Fact: Password quote ties to security. Core Idea: Isolation safe but impractical; connectivity risks. Real-World: WannaCry attack. Expanded: All subtopics point-wise with evidence (e.g., Fig 12.1-12.5), examples (e.g., Trojan horse), debates (e.g., cookies benefits vs threats).Wider Scope : From isolated systems to network threats; sources: Figures (12.1-12.5), activities (12.1-12.2).Expanded Content : Include modern aspects like phishing, zero-day; point-wise for recall; add 2025 relevance like AI malware.
Introduction & Threats Prevention
Isolation Ideal : No external link safe; but connectivity essential.Network Security : Protect device/data from misuse; threats exploit vulnerabilities.Expanded : Evidence: Quote on passwords; debates: Connectivity benefits vs risks; real: Post-2020 cyber attacks rise.
Conceptual Diagram: Threat Flow
Flow: Malware → Distribution → Infection → Prevention (Antivirus). Ties to Fig 12.1.
Why This Guide Stands Out
Comprehensive: All subtopics point-wise, figure integrations; 2025 with emerging threats, processes analyzed for scenarios.
Malware
Definition : Malicious software to damage/steal; types: Virus, Worm, Ransomware, Trojan, Spyware, Adware, Keyloggers.Virus : Spreads via contact, activates on execution; ex: ILOVEYOU.Worm : Standalone, self-replicates; ex: Storm Worm.Ransomware : Blocks/encrypts data, demands ransom; ex: WannaCry (Fig 12.1).Trojan : Disguises as legit, creates backdoors (Fig 12.2).Spyware : Tracks usage, sells data.Adware : Displays ads, pay-per-click.Keyloggers : Records keys; hardware/software; virtual vs on-screen (Fig 12.3-12.4).Distribution : Downloads, spam, removable devices, network.Signs : Pop-ups, slow system, crashes.Expanded : Evidence: WannaCry 200k computers; real: 2025 AI worms.
Antivirus
Definition : Anti-malware software; evolved from virus-only.Methods : Signature (VDF), Sandbox, Data mining, Heuristics, Real-time.Expanded : Evidence: Polymorphic evasion; debates: Free vs paid.
Spam
Definition : Unsolicited ads/emails; filters in Gmail.Expanded : Evidence: Mailing lists; real: Phishing links.
HTTP vs HTTPS
HTTP : Plain text, vulnerable.HTTPS : Encrypted, SSL certificate; for sensitive data.Expanded : Evidence: Lock icon; debates: Overhead vs security.
Firewall
Definition : Filters traffic (Fig 12.5); software/hardware.Types : Network (between nets), Host-based (on computer).Expanded : Evidence: School rule example; real: Worm barrier.
Cookies
Definition : Stored data packets; track browsing.Types : Session, Authentication.Threats : Supercookies, Zombie, third-party tracking.Expanded : Evidence: Auto-fill; debates: Convenience vs privacy.
Hackers and Crackers
Definition : Skilled in systems/networks.Types : White Hat (ethical), Black Hat (malicious), Grey Hat (neutral).Expanded : Evidence: Hacktivists; real: Ethical hiring.
Network Security Threats
DoS/DDoS : Overload resource; Bot-Net (Zombies).Intrusion : Asymmetric routing, Buffer overflow, Traffic flooding.Snooping : Capture/analyze traffic (Sniffing).Eavesdropping : Real-time intercept (Fig 12.6); vs Snooping.Expanded : Evidence: DDoS global; real: Wiretapping evolution.
Summary & Exercise
Key Takeaways : Malware evolves, prevention key; HTTPS/firewall essential; hackers vary intent.Exercise Tease : Differentiate malware; explain prevention; Q on threats.
Key Definitions & Terms - Complete Glossary
All terms from chapter; detailed with examples, relevance. Expanded: 30+ terms grouped by subtopic; added advanced like "Phishing", "Zero-Day".
Malware
Malicious software. Ex: Virus. Relevance: Damage/steal.
Virus
Spreads via files. Ex: ILOVEYOU. Relevance: Infects on execution.
Worm
Self-replicates. Ex: Storm Worm. Relevance: Network spread.
Ransomware
Encrypts data. Ex: WannaCry. Relevance: Ransom demand.
Trojan
Disguises legit. Ex: Backdoor. Relevance: User trick.
Spyware
Tracks usage. Ex: Key info. Relevance: Data sell.
Adware
Displays ads. Ex: Pop-ups. Relevance: Revenue.
Keylogger
Records keys. Ex: Passwords. Relevance: Leak sensitive.
Antivirus
Detects malware. Ex: Signature. Relevance: Prevention.
Spam
Unsolicited emails. Ex: Ads. Relevance: Tricks.
HTTP
Plain protocol. Ex: News. Relevance: Vulnerable.
HTTPS
Secure protocol. Ex: Banking. Relevance: Encrypted.
Firewall
Filters traffic. Ex: Network. Relevance: Barrier.
Cookie
Stored data. Ex: Session. Relevance: Tracking.
White Hat
Ethical hacker. Ex: Fix flaws. Relevance: Security.
Black Hat
Malicious hacker. Ex: Exploit. Relevance: Crime.
Grey Hat
Neutral hacker. Ex: Fun hack. Relevance: Challenge.
DoS
Denial service. Ex: Flood. Relevance: Overload.
DDoS
Distributed DoS. Ex: Bot-Net. Relevance: Multi-source.
Snooping
Capture traffic. Ex: Sniffing. Relevance: Analyze.
Eavesdropping
Real-time intercept. Ex: Calls. Relevance: Monitor.
Phishing (Advanced)
Trick credentials. Ex: Fake email. Relevance: Social eng.
Zero-Day (Advanced)
Unknown vuln. Ex: New exploit. Relevance: No patch.
Tip: Group by threat/prevention; examples for recall. Depth: Debates (e.g., ethical hacking). Historical: Virus 1985. Interlinks: To Ch11 Networks. Advanced: Bot-Nets. Real-Life: Cyber attacks. Graphs: Fig 12.5. Coherent: Evidence → Interpretation. For easy learning: Flashcard per term with figure snippet.
60+ Questions & Answers - NCERT Based (Class 12) - From Exercises & Variations
Based on chapter + expansions (e.g., Ex Q1-17). Part A: 10 (1 mark, one line), Part B: 10 (3 marks, four lines), Part C: 10 (4 marks, six lines), Part D: 10 (6 marks, eight lines). Answers point-wise in black text. Include examples where apt.
Part A: 1 Mark Questions (10 Qs - Short)
1. What is malware?
1 Mark Answer: Malicious software.
2. Define virus.
1 Mark Answer: Spreads via files.
3. Name one worm example.
1 Mark Answer: Storm Worm.
4. What is ransomware?
1 Mark Answer: Data blocker.
5. Define Trojan.
1 Mark Answer: Disguised malware.
6. What is spyware?
1 Mark Answer: Tracks usage.
7. Define adware.
1 Mark Answer: Displays ads.
8. What is keylogger?
1 Mark Answer: Records keys.
9. Define spam.
1 Mark Answer: Unsolicited email.
10. What is firewall?
1 Mark Answer: Traffic filter.
Part B: 3 Marks Questions (10 Qs - Medium, Exactly 4 Lines Each)
1. Differentiate virus vs worm.
3 Marks Answer:
Virus: Needs host.
Worm: Standalone.
Virus: User trigger.
Worm: Auto spread.
2. List 3 malware types with examples.
3 Marks Answer:
Ransomware: WannaCry.
Trojan: Backdoor.
Spyware: Tracks data.
Ex: Fig 12.1/12.2.
3. Explain ransomware.
3 Marks Answer:
Blocks/encrypts data.
Demands ransom.
Ex: Bitcoin payment.
Avoid backups.
4. What is antivirus? Methods.
3 Marks Answer:
Detects malware.
Signature-based.
Sandbox.
Heuristics.
5. Differentiate HTTP vs HTTPS.
3 Marks Answer:
HTTP: Plain.
HTTPS: Encrypted.
HTTP: Vulnerable.
HTTPS: Secure.
6. Explain firewall types.
3 Marks Answer:
Network: Between nets.
Host-based: On computer.
Filters traffic.
Ex: Fig 12.5.
7. What are cookies?
3 Marks Answer:
Stored data.
Track browsing.
Session/auth.
Threats: Tracking.
8. Differentiate hackers types.
3 Marks Answer:
White: Ethical.
Black: Malicious.
Grey: Neutral.
Ex: Fix vs exploit.
9. Define DoS.
3 Marks Answer:
Overloads resource.
Flood requests.
Denies service.
DDoS: Distributed.
10. Differentiate snooping vs eavesdropping.
3 Marks Answer:
Snooping: Capture/analyze.
Eavesdropping: Real-time.
Snooping: Stored.
Ex: Fig 12.6.
Part C: 4 Marks Questions (10 Qs - Medium-Long, Exactly 6 Lines Each)
1. Explain malware distribution modes.
4 Marks Answer:
Downloads: Free stuff.
Spam: Attachments.
Removable: Pen drives.
Network: Worms.
Ex: Unsolicited email.
Avoid unknown sources.
2. Describe antivirus methods (A-C).
4 Marks Answer:
A: Signature VDF.
B: Sandbox virtual.
C: Data mining classify.
Ex: Polymorphic fail.
Update regular.
Real-time monitor.
3. Explain keylogger threats.
4 Marks Answer:
Records keys.
Leaks passwords/emails.
Hardware: Transparent overlay.
Software: Logs send.
Ex: Virtual keyboard.
Avoid unknown computers.
4. Differentiate on-screen vs virtual keyboard.
4 Marks Answer:
On-screen: Fixed QWERTY.
Virtual: Randomized.
On-screen: Exploitable.
Virtual: Hard to log.
Ex: Fig 12.3/12.4.
Use for security.
5. Explain cookie threats.
4 Marks Answer:
Supercookies: Malware disguise.
Zombie: Recreates deleted.
Third-party: Track without consent.
Ex: Ad items follow.
Grant permission carefully.
Privacy risk.
6. Differentiate DoS vs DDoS.
4 Marks Answer:
DoS: Single source flood.
DDoS: Distributed Zombies.
DoS: Block easy.
DDoS: Hard resolve.
Ex: Bot-Net.
Overload resource.
7. Explain snooping.
4 Marks Answer:
Capture traffic.
Analyze/reproduce.
Not always attack.
Ex: Sniffer port.
Encrypt to avoid.
Vs eavesdropping stored.
8. Describe intrusion problems.
4 Marks Answer:
Asymmetric: Multi paths.
Buffer overflow: Code inject.
Traffic flooding: Overload detection.
Ex: Bypass sensors.
Unauthorized access.
Protect with firewall.
9. Explain spam detection.
4 Marks Answer:
Unsolicited ads.
Filters in Gmail.
Mark as spam.
Ex: Mailing lists.
Avoid clicks.
Tricks to malware.
10. Differentiate white vs black hat.
4 Marks Answer:
White: Fix flaws.
Black: Exploit law break.
White: Hired ethical.
Black: Malicious.
Ex: Security experts.
Grey: Neutral fun.
Part D: 6 Marks Questions (10 Qs - Long, Exactly 8 Lines Each)
1. Justify: Prevention better than cure for malware; list measures.
6 Marks Answer:
Signs: Pop-ups/crashes.
Antivirus update.
Avoid pirated/FOSS use.
Backups regular.
Firewall enforce.
No sensitive unknown nets.
Scan removable.
No share passwords.
2. Design prevention strategy for keyloggers.
6 Marks Answer:
Use virtual keyboard.
Avoid public computers.
Randomized layout.
Hardware: Check overlays.
Software: Antivirus scan.
Ex: Fig 12.4 online.
Vs QWERTY fixed.
Secure logins.
3. Explain 3 antivirus methods with examples.
6 Marks Answer:
Signature: VDF update.
Ex: Fails polymorphic.
Sandbox: Virtual test.
Ex: Behavior observe.
Heuristics: Pattern match.
Ex: Code compare.
Real-time: Memory monitor.
Dormant detect.
4. Differentiate DoS, DDoS, intrusion.
6 Marks Answer:
DoS: Single flood.
DDoS: Bot-Net multi.
Ex: Zombie machines.
Intrusion: Unauthorized activity.
Ex: Buffer overflow.
DoS: Overload deny.
DDoS: Hard block.
Intrusion: Exploit flaws.
5. Explain security aspects concepts: Threats, Prevention.
6 Marks Answer:
Threats: Exploit vulnerabilities.
Ex: Malware damage.
Prevention: Antivirus/firewall.
Ex: HTTPS encrypt.
Isolation ideal but impractical.
Connectivity focus.
Network protect data.
Misuse harm reputation.
6. How does eavesdropping work? Vs snooping.
6 Marks Answer:
Eavesdropping: Real-time monitor.
Ex: Calls/intercept.
Snooping: Capture/store.
Ex: Traffic analyze.
Eavesdropping: Private channels.
Snooping: Reproduce packets.
Fig 12.6: Listen hidden.
Encrypt prevent both.
7. Analyze WannaCry ransomware (Fig 12.1).
6 Marks Answer:
Encrypted data 2017.
200k computers 150 countries.
Bitcoin ransom.
Block access.
Ex: Victims cry.
Prevent updates/backups.
Spread worm-like.
Financial damage.
8. Why HTTPS over HTTP? Examples.
6 Marks Answer:
HTTP: Plain vulnerable.
HTTPS: Encrypt SSL.
Ex: Banking secure.
HTTP: News ok.
Look for lock/https.
Prevent hacker attacks.
Protocol rules data.
Sensitive use HTTPS.
9. Malware vs Antivirus: Infection signs/examples.
6 Marks Answer:
Signs: Pop-ups/slow.
Ex: Unknown programs.
Antivirus: Detect/remove.
Ex: Signature fail outdated.
Infection: Downloads/spam.
Prevent: Scan/update.
Crashes/mass emails.
Evolve continuous.
10. Network threats advantages; prevention role.
6 Marks Answer:
DoS: Deny access.
Ex: Flood packets.
Snooping: Capture unencrypted.
Ex: Troubleshoot/admin.
Prevention: Firewall/encrypt.
Ex: Fig 12.5 barrier.
2025: AI threats.
Basis for security.
Tip: Include figures in ans; practice scenarios. Additional 30 Qs: Variations on exercises, threat scenarios.
Key Concepts - In-Depth Exploration
Core ideas with examples, pitfalls, interlinks. Expanded: All concepts with steps/examples/pitfalls for easy learning. Depth: Debates, analysis.
Malware Types
Steps: 1. Infect, 2. Damage/steal, 3. Spread. Ex: Virus host. Pitfall: Undetected evolve. Interlink: Antivirus. Depth: 7 types details.
Antivirus Methods
Steps: 1. Scan, 2. Detect, 3. Remove. Ex: Sandbox safe. Pitfall: Outdated VDF. Interlink: Real-time. Depth: 5 methods.
Spam
Steps: 1. Send unsolicited, 2. Trick click. Ex: Ads. Pitfall: Phishing. Interlink: Email filters. Depth: Detection algos.
HTTP/HTTPS
Steps: 1. Transmit data, 2. Encrypt HTTPS. Ex: Lock icon. Pitfall: Man-in-middle. Interlink: SSL. Depth: Protocol rules.
Firewall
Steps: 1. Filter rules, 2. Block unauthorized. Ex: Network barrier. Pitfall: Misconfig. Interlink: Types. Depth: Traffic control.
Cookies
Steps: 1. Store data, 2. Track. Ex: Session. Pitfall: Third-party. Interlink: Threats. Depth: Types.
Hackers
Steps: 1. Exploit flaws, 2. Vary intent. Ex: White fix. Pitfall: Grey legal. Interlink: Ethical. Depth: 3 types.
DoS/DDoS
Steps: 1. Flood, 2. Deny. Ex: Bot-Net. Pitfall: Legit mix. Interlink: Zombies. Depth: Variants.
Snooping
Steps: 1. Capture, 2. Analyze. Ex: Sniffing. Pitfall: Unencrypted. Interlink: Vs eavesdrop. Depth: Tools.
Eavesdropping
Steps: 1. Intercept real-time, 2. Monitor. Ex: Calls. Pitfall: Rootkit. Interlink: Wiretap. Depth: Digital.
Phishing (Advanced)
Steps: 1. Fake lure, 2. Steal info. Ex: Email. Pitfall: Social eng. Interlink: Spam. Depth: Variants.
Zero-Day (Advanced)
Steps: 1. Unknown vuln, 2. Exploit. Ex: New malware. Pitfall: No signature. Interlink: Heuristics. Depth: Patches.
Advanced: Cyber laws, encryption. Pitfalls: Outdated software. Interlinks: To Ch11. Real: Ransomware cases. Depth: 12 concepts details. Examples: Real figures. Graphs: Fig 12.5. Errors: Click spam. Tips: Steps evidence; compare threats (virus vs worm).
Examples & Figures - From Text with Simple Explanations
Expanded with evidence, analysis; focus on figures. Added variations for practice.
Example 1: Ransomware (Fig 12.1 - WannaCry)
Simple Explanation: Encrypts, demands payment.
Aspect Detail Impact 200k computers Ransom Bitcoin
Step 1: Infect via vuln.
Step 2: Encrypt files.
Step 3: Pay or lose.
Simple Way: Backups avoid.
Example 2: Trojan Horse (Fig 12.2 - Concept)
Simple Explanation: Hidden soldiers/malware.
Aspect Detail Disguise Legit software Action Backdoor
Step 1: User install.
Step 2: Activate malicious.
Step 3: Access system.
Simple Way: Scan downloads.
Example 3: QWERTY Keyboard (Fig 12.3 - Fixed)
Simple Explanation: Exploitable by keyloggers.
Aspect Detail Layout Fixed Risk Record positions
Step 1: Press keys.
Step 2: Logger maps.
Step 3: Leak info.
Simple Way: Use virtual.
Example 4: Online Virtual Keyboard (Fig 12.4 - Randomized)
Simple Explanation: Hard to log (2025 secure).
Aspect Detail Layout Random Benefit Confuses logger
Step 1: Load random.
Step 2: Click keys.
Step 3: No position map.
Simple Way: Banking use.
Example 5: Firewall (Fig 12.5 - Between Networks)
Simple Explanation: Blocks unauthorized.
Aspect Detail Type Network Action Filter rules
Step 1: Define rules.
Step 2: Monitor traffic.
Step 3: Block threats.
Simple Way: LAN protect.
Example 6: Eavesdropping (Fig 12.6 - Intercept)
Simple Explanation: Real-time listen.
Aspect Detail Method Rootkit Risk Private comm
Step 1: Hack device.
Step 2: Monitor live.
Step 3: Steal info.
Simple Way: Encrypt calls.
Tip: Visualize figures; troubleshoot (e.g., no firewall breach). Added for threats, preventions.
Interactive Quiz - Master Security Aspects
10 MCQs in full sentences; 80%+ goal. Covers malware, threats, prevention.
Start Quiz
Quick Revision Notes & Mnemonics
Concise, easy-to-learn summaries for all subtopics. Structured in tables for quick scan: Key points, examples, mnemonics. Covers malware, prevention, threats. Bold key terms; short phrases for fast reading.
Subtopic
Key Points
Examples
Mnemonics/Tips
Threats Prevention Isolation : Safe but impractical.Protect data/misuse. Connectivity risks.
IPM (Isolation Protect Misuse). Tip: "Connect Carefully" – Use HTTPS/firewall.
Malware Types : Virus/Worm/Ransom/Trojan/Spy/Ad/Key.Distrib: Download/Spam/Removable/Net. WannaCry encrypt.
VWRTS AK (Virus Worm Ransom Trojan Spy Ad Key). Tip: "Malware Spreads Via Downloads" – Scan always.
Antivirus Methods : Signature/Sandbox/Data/Heur/Real-time.Update VDF. Polymorphic fail.
SSDHR (Signature Sandbox Data Heur Real). Tip: "Antivirus Scans Daily" – Prevent evolve.
Spam/HTTP Spam : Unsolicited filter.HTTP : Plain vs HTTPS encrypt.Gmail mark.
SHE (Spam HTTP Encrypt). Tip: "Spam Hides Exploits" – Lock icon check.
Firewall/Cookies Firewall : Filter types network/host.Cookies : Track session/threats.Fig 12.5 barrier.
FC (Filter Cookies). Tip: "Firewall Blocks Cookies Track" – Permission careful.
Hackers/Threats Hackers : White/Black/Grey.Threats : DoS/DDoS/Snoop/Eaves.Bot-Net DDoS.
WBG-DSE (White Black Grey DoS Snoop Eaves). Tip: "Hackers Break, Threats Deny" – Ethical fix.
Overall Tip: Use IPM-VWRTS AK-SSDHR-SHE-FC-WBG-DSE for full scan (5 mins). Flashcards: Front (term), Back (points + mnemonic). Print table for wall revision. Covers 100% chapter – easy for exams!
Key Terms & Processes - All Key
Expanded table 30+ rows; quick ref. Added advanced (e.g., Phishing, Bot-Net).
Term/Process Description Example Usage
Malware Malicious software Virus Damage Virus Spreads via host ILOVEYOU Infect files Worm Self-replicate Storm Worm Network Ransomware Encrypt/ransom WannaCry Block data Trojan Disguise legit Backdoor Trick install Spyware Track info Usage data Sell ads Adware Display ads Pop-ups Revenue Keylogger Record keys Passwords Leak Antivirus Detect/remove Signature Prevention Spam Unsolicited Ads email Tricks HTTP Plain protocol News sites Vulnerable HTTPS Secure encrypt Banking Protect Firewall Filter traffic Network Barrier Cookie Store browsing Session Track White Hat Ethical hacker Fix flaws Security Black Hat Malicious Exploit Crime Grey Hat Neutral Fun hack Challenge DoS Denial service Flood Overload DDoS Distributed DoS Bot-Net Multi Snooping Capture traffic Sniffing Analyze Eavesdropping Real-time intercept Calls Monitor Phishing Trick credentials Fake email Social eng Bot-Net Zombie network DDoS Control Signature Virus bytes VDF Detect Sandbox Virtual test Behavior Safe run Heuristics Pattern match Code compare Unknown Buffer Overflow Code inject DoS Intrusion Supercookie Malware disguise Tracking Threat Zombie Cookie Recreates deleted Persistent Threat Hacktivist Political hacker Social change Intent Wiretapping Old eavesdrop Phones Intercept Rootkit Hidden malware Eavesdrop Stealth
Tip: Examples memory; sort subtopic. Easy: Table scan. Added 10 rows depth.
Security Processes Step-by-Step
Step-by-step breakdowns of core processes, structured as full questions followed by detailed answers with steps. Visual descriptions for easy understanding; focus on actionable Q&A with examples from chapter.
Question 1: How does malware infect and how to prevent as in examples?
Answer:
Step 1: Distribute (download/spam).
Step 2: Infect (execute file).
Step 3: Damage (steal/block).
Step 4: Scan antivirus.
Step 5: Update software.
Step 6: Avoid unknown.
Visual: Chain – Download → Infect → Prevent (Antivirus). Example: WannaCry spread.
Question 2: What steps in antivirus detection (signature method)?
Answer:
Step 1: Update VDF.
Step 2: Scan files.
Step 3: Match signatures.
Step 4: Quarantine match.
Step 5: Remove malware.
Step 6: Report user.
Visual: Database match – File → Signature → Detect. Example: Virus bytes.
Question 3: How to use virtual keyboard against keyloggers (Fig 12.4)?
Answer:
Step 1: Load online.
Step 2: Random layout.
Step 3: Click keys mouse.
Step 4: Input sensitive.
Step 5: No key press log.
Step 6: Close session.
Visual: Shuffle keys – Random → Click → Secure. Example: Banking login.
Question 4: Process of firewall filtering (Fig 12.5)?
Answer:
Step 1: Define rules.
Step 2: Monitor incoming/out.
Step 3: Match packets.
Step 4: Block unauthorized.
Step 5: Allow trusted.
Step 6: Log events.
Visual: Wall barrier – Traffic → Filter → Pass/Block. Example: Student access limit.
Question 5: How does DDoS attack work?
Answer:
Step 1: Compromise Zombies.
Step 2: Install Bot.
Step 3: Activate Bot-Net.
Step 4: Flood target.
Step 5: Overload deny.
Step 6: Hard recover.
Visual: Network flood – Zombies → Target → Crash. Example: Global distributed.
Question 6: Steps to handle cookie permissions.
Answer:
Step 1: Site requests.
Step 2: Check third-party.
Step 3: Grant selective.
Step 4: Clear regularly.
Step 5: Avoid zombie.
Step 6: Privacy settings.
Visual: Data packet – Store → Track → Manage. Example: Ad follow.
Tip: Treat as FAQ; apply to figures. Easy: Q → Steps + Visual. Full Q&A for exam-like practice.
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Class 12 Political Science — Challenges to and Restoration of the Congress System (Practice Quiz)
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Class 12 Political Science — India's External Relations (Practice Quiz)
#53
Class 12 Political Science — Politics of Planned Development (Practice Quiz)
#54
Class 12 Political Science — Era of One-party Dominance (Practice Quiz)
#55
Class 12 Political Science — Challenges of Nation Building (Practice Quiz)
#56
Class 12 Political Science — Environment and Natural Resources (Practice Quiz)
#57
Class 12 Political Science — Security in the Contemporary World (Practice Quiz)
#58
Class 12 Political Science — International Organisations (Practice Quiz)
#59
Class 12 Political Science — Contemporary South Asia (Practice Quiz)
#60
Class 12 Political Science — Contemporary Centres of Power (Practice Quiz)
#61
Class 12 Political Science — The End of Bipolarity (Practice Quiz)
#62
Class 12 Geography — Geographical Perspective on Selected Issues and Problems (Practice Quiz)
#63
Class 12 Geography — Planning and Sustainable Development in the Indian Context (Practice Quiz)
#64
Class 12 Geography — Mineral and Energy Resources (Practice Quiz)
#65
Class 12 Geography — Water Resources (Practice Quiz)
#66
Class 12 Geography — Land Resources and Agriculture (Practice Quiz)
#67
Class 12 Geography — Human Settlements (Practice Quiz)
#68
Class 12 Geography — Population: Distribution, Density, Growth and Composition (Practice Quiz)
#69
Class 12 Geography — International Trade (India) (Practice Quiz)
#70
Class 12 Geography — Transport and Communication (India) (Practice Quiz)
#71
Class 12 Geography — Primary Activities (Practice Quiz)
#72
Class 12 Geography — Human Development (Practice Quiz)
#73
Class 12 Geography — The World Population: Distribution, Density and Growth (Practice Quiz)
#74
Class 12 Geography — Human Geography: Nature and Scope (Practice Quiz)
#75
Class 12 History — Framing the Constitution — The Beginning of a New Era (Practice Quiz)
#76
Class 12 History — Mahatma Gandhi and the Nationalist Movement — Civil Disobedience and Beyond (Practice Quiz)
#77
Class 12 History — Rebels and the Raj — The Revolt of 1857 and its Representations (Practice Quiz)
#78
Class 12 History — Colonialism and the Countryside — Exploring Official Archives (Practice Quiz)
#79
Class 12 History — Peasants, Zamindars and the State — Agrarian Society and the Mughal Empire (c. sixteenth-seventeenth centuries) (Practice Quiz)
#80
Class 12 History — An Imperial Capital: Vijayanagara (c. fourteenth to sixteenth century) (Practice Quiz)
#81
Class 12 History — Bhakti-Sufi Traditions — Changes in Religious Beliefs and Devotional Texts (c. eighth to eighteenth century) (Practice Quiz)
#82
Class 12 History — Through the Eyes of Travellers — Perceptions of Society (c. tenth to seventeenth century) (Practice Quiz)
#83
Class 12 History — Thinkers, Beliefs and Buildings — Cultural Developments (c. 600 BCE-600 CE) (Practice Quiz)
#84
Class 12 History — Kinship, Caste and Class — Early Societies (c. 600 BCE-600 CE) (Practice Quiz)
#85
Class 12 History — Kings, Farmers and Towns — Early States and Economies (c. 600 BCE-600 CE) (Practice Quiz)
#86
Class 12 History — Bricks, Beads and Bones — The Harappan Civilisation (Practice Quiz)
#87
Class 12 Economics — Open Economy Macroeconomics (Practice Quiz)
#88
Class 12 Economics — Government Budget and the Economy (Practice Quiz)
#89
Class 12 Economics — Determination of Income and Employment (Practice Quiz)
#90
Class 12 Economics — Money and Banking (Practice Quiz)
#91
Class 12 Economics — National Income Accounting (Practice Quiz)
#92
Class 12 Economics — Market Equilibrium (Practice Quiz)
#93
Class 12 Economics — The Theory of the Firm under Perfect Competition (Practice Quiz)
#94
Class 12 Economics — Production and Costs (Practice Quiz)
#95
Class 12 Economics — Theory of Consumer Behaviour (Practice Quiz)
#96
Class 12 Economics — Introduction (Practice Quiz)
#97
Class 12 Business Studies — Consumer Protection (Practice Quiz)
#98
Class 12 Business Studies — Marketing (Practice Quiz)
#99
Class 12 Business Studies — Financial Management (Practice Quiz)
#100
Class 12 Business Studies — Controlling (Practice Quiz)
#101
Class 12 Business Studies — Directing (Practice Quiz)
#102
Class 12 Business Studies — Staffing (Practice Quiz)
#103
Class 12 Business Studies — Organising (Practice Quiz)
#104
Class 12 Business Studies — Planning (Practice Quiz)
#105
Class 12 Business Studies — Business Environment (Practice Quiz)
#106
Class 12 Business Studies — Nature and Significance of Management (Practice Quiz)
#107
Class 12 Accountancy — Cash Flow Statement (Practice Quiz)
#108
Class 12 Accountancy — Accounting Ratios (Practice Quiz)
#109
Class 12 Accountancy — Analysis of Financial Statements (Practice Quiz)
#110
Class 12 Accountancy — Financial Statements of a Company (Practice Quiz)
#111
Class 12 Accountancy — Issue and Redemption of Debentures (Practice Quiz)
#112
Class 12 Accountancy — Accounting for Share Capital (Practice Quiz)
#113
Class 12 Accountancy — Dissolution of Partnership Firm (Practice Quiz)
#114
Class 12 Accountancy — Reconstitution of a Partnership Firm – Retirement/Death of a Partner (Practice Quiz)
#115
Class 12 Accountancy — Reconstitution of a Partnership Firm – Admission of a Partner (Practice Quiz)
#116
Class 12 Accountancy — Accounting for Partnership: Basic Concepts (Practice Quiz)
#117
Class 12 Maths — Probability (Practice Quiz)
#118
Class 12 Maths — Linear Programming (Practice Quiz)
#119
Class 12 Maths — Three Dimensional Geometry (Practice Quiz)
#120
Class 12 Maths — Vector Algebra (Practice Quiz)
#121
Class 12 Maths — Differential Equations (Practice Quiz)
#122
Class 12 Maths — Application of Integrals (Practice Quiz)
#123
Class 12 Maths — Integrals (Practice Quiz)
#124
Class 12 Maths — Application of Derivatives (Practice Quiz)
#125
Class 12 Maths — Continuity and Differentiability (Practice Quiz)
#126
Class 12 Maths — Determinants (Practice Quiz)
#127
Class 12 Maths — Matrices (Practice Quiz)
#128
Class 12 Maths — Inverse Trigonometric Functions (Practice Quiz)
#129
Class 12 Maths — Relations and Functions (Practice Quiz)
#130
Class 12 Biology — Biodiversity and its Conservation (Practice Quiz)
#131
Class 12 Biology — Ecosystem (Practice Quiz)
#132
Class 12 Biology — Organisms and Populations (Practice Quiz)
#133
Class 12 Biology — Biotechnology and its Applications (Practice Quiz)
#134
Class 12 Biology — Biotechnology: Principles and Processes (Practice Quiz)
#135
Class 12 Biology — Microbes in Human Welfare (Practice Quiz)
#136
Class 12 Biology — Human Health and Disease (Practice Quiz)
#137
Class 12 Biology — Evolution (Practice Quiz)
#138
Class 12 Biology — Molecular Basis of Inheritance (Practice Quiz)
#139
Class 12 Biology — Principles of Inheritance and Variation (Practice Quiz)
#140
Class 12 Biology — Reproductive Health (Practice Quiz)
#141
Class 12 Biology — Human Reproduction (Practice Quiz)
#142
Class 12 Biology — Sexual Reproduction in Flowering Plants (Practice Quiz)
#143
Class 12 Chemistry — Biomolecules (Practice Quiz)
#144
Class 12 Chemistry — Amines (Practice Quiz)
#145
Class 12 Chemistry — Aldehydes, Ketones and Carboxylic Acids (Practice Quiz)
#146
Class 12 Chemistry — Alcohols, Phenols and Ethers (Practice Quiz)
#147
Class 12 Chemistry — Haloalkanes and Haloarenes (Practice Quiz)
#148
Class 12 Chemistry — Coordination Compounds (Practice Quiz)
#149
Class 12 Chemistry — The d- and f-Block Elements (Practice Quiz)
#150
Class 12 Chemistry — Chemical Kinetics (Practice Quiz)
#151
Class 12 Chemistry — Electrochemistry (Practice Quiz)
#152
Class 12 Chemistry — Solutions (Practice Quiz)
#153
Class 12 Physics — Semiconductor Electronics: Materials, Devices and Simple Circuits (Practice Quiz)
#154
Class 12 Physics — Nuclei (Practice Quiz)
#155
Class 12 Physics — Atoms (Practice Quiz)
#156
Class 12 Physics — Dual Nature of Radiation and Matter (Practice Quiz)
#157
Class 12 Physics — Wave Optics (Practice Quiz)
#158
Class 12 Physics — Ray Optics and Optical Instruments (Practice Quiz)
#159
Class 12 Physics — Electromagnetic Waves (Practice Quiz)
#160
Class 12 Physics — Alternating Current (Practice Quiz)
#161
Class 12 Physics — Electromagnetic Induction (Practice Quiz)
#162
Class 12 Physics — Magnetism and Matter (Practice Quiz)
#163
Class 12 Physics — Moving Charges and Magnetism (Practice Quiz)
#164
Class 12 Physics — Electrostatic Potential and Capacitance (Practice Quiz)
#165
Class 12 Physics — Electric Charges and Fields (Practice Quiz)
#166
CBSE Class 12 — Genetics and Evolution (Practice Quiz)
#167
CBSE Class 12 — Matrices and Determinants (Practice Quiz)
#168
CBSE Class 12 — Solutions and Colligative Properties (Practice Quiz)
#169
Class 12 Physics — Current Electricity (Practice Quiz)
#170
CBSE Class 12 — Electrostatics and Electric Field (Practice Quiz)
#171
Humanities Subjects Practice Quiz | CBSE Class 12 Board Examination
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