ProSyllabus Journal CBSE Class 12 Board Examination 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 1 year ago NCERT · Class XII · Computer Science · Chapter 12 · Security Aspects · Data Security · Cybersecurity · Threats · Prevention · Summary · Questions · Answers · Programming · Comprehension
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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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Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: key concepts in 2 lines each Chekhov, Basheer and Nirmal Verma introduced کلرک کی موت: 1 sneeze, 5 apologies Event order and characters for each story 3 stories compared in one table Method for writing board answers Page 1 free about 8 min read , Full kit about 55 min read ₹159
Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: key concepts in 2 lines each 20 marks: SQL and databases, Unit 3 10 marks: Networks, Unit 2 7 chapters: every output run and checked Stack algorithms and output questions Text, binary and CSV file programs Page 1 free about 8 min read , Full kit about 55 min read ₹159
Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: key concepts in 2 lines each, common traps 7 marks in every paper: Biomolecules 6 marks in each 2025 set: Haloalkanes Common traps that cost marks, listed 4–5-mark question every paper: Alcohols Named reactions, reagents, conditions Page 1 free about 8 min read , Full kit about 55 min read ₹159
Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: key concepts in 2 lines each, common traps 24 of 92 board marks: Bengal School 20 of 92 board marks: Mughal School Common traps that cost marks, listed 17 of 92 board marks: Rajasthani Schools 11 of 92: modern art, mostly 2-markers Page 1 free about 8 min read , Full kit about 55 min read ₹159
Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: key concepts in 2 lines each 30 theory marks, all five units Bhairav, Bageshri, Malkauns in full Jhaptal, Rupak, Dhamar: dugun to chaugun Sangeet Ratnakar and Parijat, by chapter Tuning the tanpura and the sitar Page 1 free about 8 min read , Full kit about 55 min read ₹159
Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: key concepts in 2 lines each, common traps 16 marks: Reproduction, Unit VI 12 marks each: Units VIII and IX 10 marks: Ecology, Unit X 13 chapters, with page numbers Common traps, corrected Page 1 free about 8 min read , Full kit about 55 min read ₹159
Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: key concepts in 2 lines each, common traps 35 of 140 board marks: SQL functions 20 board marks: networks and the web Common traps, corrected 12 board marks: Matplotlib plots Every statement with its exact output Page 1 free about 8 min read , Full kit about 55 min read ₹159
Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: key concepts in 2 lines each 12 exam traps, listed 65 board marks: Admission of a Partner 26 board marks: Dissolution 22 board marks: Retirement/Death Goodwill formulas with the book's figures Page 1 free about 8 min read , Full kit about 55 min read ₹159
Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: key concepts in 2 lines each 40 marks: Unit V, rDNA and genomes 30 marks: Unit VI, culture and bioprocess 10 syllabus chapters: every vector, enzyme PCR, blots and DNA fingerprinting Every number tied to its book page Page 1 free about 8 min read , Full kit about 55 min read ₹159
Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: key concepts in 2 lines each, common traps 15 marks in every 2025 set: share capital 9 marks in every 2025 set: debentures Common traps that cost marks, listed 6-mark cash flow in every paper 5 marks in every 2025 set: ratios Page 1 free about 8 min read , Full kit about 55 min read ₹159
Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: key concepts in 2 lines each Elements of a poem and a story, Unit 1 Feature and article writing, Unit 2 Radio and TV script rules, with marks Steps and types of translation, Unit 3 Levels of editing, Unit 4 Page 1 free about 8 min read , Full kit about 55 min read ₹159
Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: most-asked concepts in 2 lines each 8 chapters ranked by what the board asked 31 marks: Organising, a 6-marker every set 30 marks in 4 papers: nature of management 14 principles of Fayol Case cues the board keeps using Page 1 free about 8 min read , Full kit about 55 min read ₹159
Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: key concepts in 2 lines each 16 of 60 board marks: taal comparison 12 of 60 board marks: gharanas 13 thekas, from thah to chaugun 6 marks: history of the tabla, Unit 3 4 biographies, with dates Page 1 free about 8 min read , Full kit about 55 min read ₹159
Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: key concepts in 2 lines each 15 marks each: Units 9–10 and 11–12 4 Ps of marketing, Unit 11 Consumer Protection Act 2019 tiers, appeals Capital structure with EBIT-EPS examples The three financial decisions, every factor Page 1 free about 8 min read , Full kit about 55 min read ₹159
Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: key concepts in 2 lines each 10 marks: National Income Accounting 3 methods for GDP, with identities M1–M4 and credit creation, Ch 3 Every deficit measure of the budget, Ch 5 6 chapters: every formula, board numerical Page 1 free about 8 min read , Full kit about 55 min read ₹159
Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: key concepts in 2 lines each, common traps 12 marks: Unit 6, Ch 1–3 8 marks: Unit 8, India-China-Pakistan Every committee, policy and date, by chapter Data tables with the book's own numbers Common traps, corrected Page 1 free about 8 min read , Full kit about 55 min read ₹159
Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: key concepts in 2 lines each, common traps 23 of 100 marks: Thinkers, Beliefs, Buildings 22 of 100 board marks: Harappa 20 of 100 marks: Kinship, Caste and Class 8-mark answer: Theme 2 in 3 of 4 papers 5 marks: the Part I map list Page 1 free about 8 min read , Full kit about 55 min read ₹159
Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: key concepts in 2 lines each 24 of 100 board marks: Vijayanagara 24 of 100 marks: Mughal village, Theme 8 Q24 from Vijayanagara in every 2025 set 3 of 4 papers: source question on travellers 5 marks: the two map lists Page 1 free about 8 min read , Full kit about 55 min read ₹159
Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: key concepts in 2 lines each 1857 and National Movement map items Constituent Assembly committees table Gandhiji 1915–1931: Champaran to Salt March Permanent Settlement and the Fifth Report Bombay Deccan: ryotwari and the 1875 riots Page 1 free about 8 min read , Full kit about 55 min read ₹159
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Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: key concepts in 2 lines each, common traps 22 textbook marks: how each is asked 3 stories: 10 marks in the sample paper Common traps that cost marks, listed 9 poems side by side, with devices 5 essays, each argument set out Page 1 free about 8 min read , Full kit about 55 min read ₹159
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Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Marks booster + cheatsheet: key concepts in 2 lines each, common traps 38 of the 70 theory marks: Ch 1–7 10 marks: Unit III, ECCE to elderly Common traps that cost marks, listed 5 marks: Unit I, work and careers 2025 paper and SQP: ranked by what they asked Page 1 free about 8 min read , Full kit about 55 min read ₹159
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Read page 1 free Get the kit Get the kit One payment · instant PDF · ₹159 View details Get alerts for CBSE Class 12 Board Examination
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This chapter is part of the CBSE Class 12 Board Examination Board Examination Explore every chapter — summary, notes, extra questions & MCQ quizzes Preparing for CBSE Class 12 Board Examination? Students also sit JEE is set on the Class 11 and 12 Physics, Chemistry and Maths syllabus; students prepare for boards and JEE together.
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The Last Lesson
Start here
#2
Economics (Class 12) Practice Quiz | CBSE Class 12 Board Examination
#3
#4
Challenges of Nation Building
#5
#6
#7
#8
Human Geography: Nature and Scope
#9
Bricks, Beads and Bones — The Harappan Civilisation
#10
#11
#12
#13
#14
#15
#16
#17
Inverse Trigonometric Functions
#18
#19
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Journey to the End of the Earth
#21
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#23
#24
#25
#26
#27
#28
#29
The Challenges of Cultural Diversity
#30
Patterns of Social Inequality and Exclusion
#31
Social Institutions: Continuity and Change
#32
The Demographic Structure of the Indian Society
#33
Introducing Indian Society
#34
#35
Security in the Contemporary World
#36
International Trade (India)
#37
Transport and Communication (India)
#38
Tertiary and Quaternary Activities
#39
#40
Kings, Farmers and Towns — Early States and Economies (c. 600 BCE-600 CE)
#41
Theory of Consumer Behaviour
#42
#43
#44
Nature and Significance of Management
#45
Dissolution of Partnership Firm
#46
Accounting for Partnership: Basic Concepts
#47
Three Dimensional Geometry
#48
Continuity and Differentiability
#49
#50
#51
Principles of Inheritance and Variation
#52
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#55
#56
#57
Accountancy (Class 12) Practice Quiz | CBSE Class 12 Board Examination
#58
Electrostatic Potential and Capacitance Fundamentals | CBSE Class 12 Board Examination
#59
#60
An Elementary School Classroom in a Slum
#61
#62
Social Influence and Group Processes
#63
Attitude and Social Cognition
#64
#65
#66
#67
Variations in Psychological Attributes
#68
#69
Mass Media and Communications
#70
Globalisation and Social Change
#71
Change and Development in Industrial Society
#72
Change and Development in Rural Society
#73
The Constitution and Social Change
#74
The Market as a Social Institution
#75
Recent Developments in Indian Politics
#76
The Crisis of Democratic Order
#77
Challenges to and Restoration of the Congress System
#78
India's External Relations
#79
Politics of Planned Development
#80
Era of One-party Dominance
#81
Environment and Natural Resources
#82
International Organisations
#83
#84
Contemporary Centres of Power
#85
Geographical Perspective on Selected Issues and Problems
#86
Planning and Sustainable Development in the Indian Context
#87
Mineral and Energy Resources
#88
#89
Land Resources and Agriculture
#90
#91
Population: Distribution, Density, Growth and Composition
#92
#93
#94
The World Population: Distribution, Density and Growth
#95
Framing the Constitution — The Beginning of a New Era
#96
Mahatma Gandhi and the Nationalist Movement — Civil Disobedience and Beyond
#97
Rebels and the Raj — The Revolt of 1857 and its Representations
#98
Colonialism and the Countryside — Exploring Official Archives
#99
Peasants, Zamindars and the State — Agrarian Society and the Mughal Empire (c. sixteenth-seventeenth centuries)
#100
An Imperial Capital: Vijayanagara (c. fourteenth to sixteenth century)
#101
Bhakti-Sufi Traditions — Changes in Religious Beliefs and Devotional Texts (c. eighth to eighteenth century)
#102
Through the Eyes of Travellers — Perceptions of Society (c. tenth to seventeenth century)
#103
Thinkers, Beliefs and Buildings — Cultural Developments (c. 600 BCE-600 CE)
#104
Kinship, Caste and Class — Early Societies (c. 600 BCE-600 CE)
#105
Open Economy Macroeconomics
#106
Government Budget and the Economy
#107
Determination of Income and Employment
#108
National Income Accounting
#109
#110
The Theory of the Firm under Perfect Competition
#111
#112
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#114
#115
#116
#117
#118
#119
#120
#121
#122
Analysis of Financial Statements
#123
Financial Statements of a Company
#124
Issue and Redemption of Debentures
#125
Accounting for Share Capital
#126
Reconstitution of a Partnership Firm – Retirement/Death of a Partner
#127
Reconstitution of a Partnership Firm – Admission of a Partner
#128
#129
#130
#131
#132
#133
#134
Application of Derivatives
#135
Biodiversity and its Conservation
#136
#137
Organisms and Populations
#138
Biotechnology and its Applications
#139
Biotechnology: Principles and Processes
#140
Microbes in Human Welfare
#141
#142
#143
Molecular Basis of Inheritance
#144
Sexual Reproduction in Flowering Plants
#145
#146
#147
Aldehydes, Ketones and Carboxylic Acids
#148
Alcohols, Phenols and Ethers
#149
Haloalkanes and Haloarenes
#150
#151
The d- and f-Block Elements
#152
#153
Semiconductor Electronics: Materials, Devices and Simple Circuits
#154
#155
#156
Dual Nature of Radiation and Matter
#157
#158
Ray Optics and Optical Instruments
#159
#160
#161
Electromagnetic Induction
#162
#163
Moving Charges and Magnetism
#164
Electrostatic Potential and Capacitance
#165
Electric Charges and Fields
#166
CBSE Class 12 — Genetics and Evolution
#167
CBSE Class 12 — Matrices and Determinants
#168
CBSE Class 12 — Solutions and Colligative Properties
#169
#170
CBSE Class 12 — Electrostatics and Electric Field
#171
Humanities Subjects Practice Quiz | CBSE Class 12 Board Examination
More on CBSE Class 12 Board Examination20 guides How to Score Good Marks in Class 12 CBSE: Marks Map by Stream CBSE Class 12 Pre-Board Marks: Do They Count, and What to Do If Low Complete Summary and Solutions for Database Concepts – NCERT Class XII Computer Science, Chapter 8 – File Systems, DBMS, Relational Models, Keys, SQL Introduction, Questions, Answers Complete Summary and Solutions for Consumer Education and Protection – NCERT Human Ecology and Family Sciences, Chapter 12 – Study Summary, Explanation, Questions, Answers Complete Summary and Solutions for Supplementary Chemistry Material – NCERT Class XII Chemistry Part I Supplementary Resources – Additional Examples, Problems, and Explanations Complete Summary and Solutions for Project Based Learning – NCERT Class XII Computer Science, Chapter 13 – Project Planning, Implementation, Presentation, Documentation, and Evaluation Complete Summary and Solutions for Querying and SQL Functions – NCERT Class XII Informatics Practices, Chapter 1 – Explanation, Questions, Answers अंतरा भाग 2 – कक्षा 12 के लिए हिंदी (ऐच्छिक) की पाठ्यपुस्तक story खंड – पाठ-16 अंतरा भाग 2 – कक्षा 12 के लिए हिंदी (ऐच्छिक) की पाठ्यपुस्तक काव्य खंड – तुलसीदास: (क) भरत-राम का प्रेम, (ख) पद अंतरा भाग 2 – कक्षा 12 के लिए हिंदी (ऐच्छिक) की पाठ्यपुस्तक story खंड – पाठ-17 अंतरा भाग 2 – कक्षा 12 के लिए हिंदी (ऐच्छिक) की पाठ्यपुस्तक काव्य खंड – मलिक मुहम्मद जायसी: बारहमासा अंतरा भाग 2 – कक्षा 12 के लिए हिंदी (ऐच्छिक) की पाठ्यपुस्तक story खंड – पाठ-15 अंतरा भाग 2 – कक्षा 12 के लिए हिंदी (ऐच्छिक) की पाठ्यपुस्तक काव्य खंड – विष्णु खरे: (क) सत्य, (ख) एक कम अंतरा भाग 2 – कक्षा 12 के लिए हिंदी (ऐच्छिक) की पाठ्यपुस्तक story खंड – पाठ-11 अंतरा भाग 2 – कक्षा 12 हिंदी (ऐच्छिक) काव्य खंड – जयशंकर प्रसाद: (क) देवसेना का गीत, (ख) कार्नेलिया का गीत – संपूर्ण सारांश, व्याख्या, प्रश्न और उत्तर अंतरा भाग 2 – कक्षा 12 के लिए हिंदी (ऐच्छिक) की पाठ्यपुस्तक काव्य खंड – विद्यापति: पद अंतरा भाग 2 – कक्षा 12 के लिए हिंदी (ऐच्छिक) पाठ्यपुस्तक story खंड – पाठ-12 अंतरा भाग 2 – कक्षा 12 के लिए हिंदी (ऐच्छिक) की पाठ्यपुस्तक काव्य खंड – सूर्यकांत त्रिपाठी ‘निराला’: (क) गीत गाने दो मुझे, (ख) सरोज-स्मृति अंतरा भाग 2 – कक्षा 12 के लिए हिंदी (ऐच्छिक) की पाठ्यपुस्तक story खंड – पाठ-10 अंतरा भाग 2 – कक्षा 12 के लिए हिंदी (ऐच्छिक) की पाठ्यपुस्तक काव्य खंड – कुकुआन: दोह Notebook backup + AI Save your notes. Revise with AI. Learn more → Share this article
