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45. Practice Exercises with Hints

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Chala mitrano, Part 12 complete – aata Part 13 revision. Theory + labs aadhi zhale; aata practice exercises with hints. Exam modules / interview madhe "kase solve" matter – pan pehle ethics: OWN lab, written permission, host-only (192.168.56.0/24). Neighbour / client / cafe target never. Ghabru naka – section ni section solve kara, hint bagha, mag Lab + Red vs Blue. He khup important aahe – revise with ethics first!

What you will practise in this chapter

  • How to use exercises – ethics, OWN lab, hint discipline
  • Networking foundations drill (IP, ports, TCP/UDP, OSI)
  • Linux on EC2 (sudo yum, sudo service, permissions, logs)
  • Web servers + MySQL safe queries and keys
  • Domains, S3, RDS and live-project security checklist
  • Kali recon / scan / enum – host-only only
  • OWASP Top 10 fixes on DVWA / Juice Shop (OWN)
  • Cloud, SOC, hardening and crypto quick drills
  • AD / malware / DoS / session / evasion / IoT / mobile – defensive drills
  • Capstone Project Build-Hack-Fix for Sahyadri or Raja-Rani Traders

Lab scope

Every offensive step in this chapter targets only systems you own: VirtualBox/VMware host-only (Kali 192.168.56.10, Metasploitable 192.168.56.20, DVWA/Juice 192.168.56.30–.50), your Free Tier EC2, or your Android emulator. Never scan, fuzz, or exploit a classmate phone, office Wi-Fi, client site, or public cafe. IT Act sections such as 43 and 66 apply without authority (verify current text). Hint ≠ permission to break the law. Lab = learn. Production = defend.

Concepts in this chapter

  1. 45.1How to Use These Exercises – Ethics First
  2. 45.2Networking Foundations – Quick Fire
  3. 45.3Linux on EC2 – Commands You Must Type Blind
  4. 45.4Web Servers and MySQL – Build and Protect
  5. 45.5Domains, S3, RDS and Project Checklist
  6. 45.6Kali Recon, Scan and Enum – Host-Only Only
  7. 45.7OWASP Top 10 – Fix What You Break (DVWA / Juice)
  8. 45.8Cloud, SOC, Hardening and Crypto – Mixed Drill
  9. 45.9Advanced Defensive Drills – AD to Mobile
  10. 45.10Capstone – Project Build-Hack-Fix (Sahyadri or Raja-Rani)

The chapter recap is at the end of the last concept page.

Chapter 45: Practice exercises with hints — practice tasks

Open chapter lessons · Full guided lab: ceh revision tracker 20 practice questions (not repeated here)

45.1 Pick 5 CEH topics to revise

EasyIT

Why: Spaced practice beats cramming.

What: Open the revision tracker lab and mark 5 weak topics.

How:

  1. Score yourself 1–5 per topic.
  2. Schedule the lowest three this week.

Expected output: A short plan with dates.

Hint

Use chapter quizzes too.

Answer / how to check
  1. Three topics have dates.

45.2 Teach-back one concept

MediumRetail

Why: Teaching proves you understand.

What: Explain ports vs protocols to a friend (or voice memo) in 3 minutes.

How:

  1. Cover TCP/UDP, examples 22/80/443.
  2. No jargon without meaning.

Expected output: Recording under 3 minutes.

Hint

Easy English.

Answer / how to check
  1. You used at least 3 real port numbers.

45.3 Lab redo under time

MediumBanking

Why: Speed comes from repetition.

What: Re-do harden-ubuntu lab with a 45-minute timer.

How:

  1. Snapshot first.
  2. Stop at 45 minutes; note unfinished steps.

Expected output: Checklist with Done/Not done.

Hint

Redo Not-done items tomorrow.

Answer / how to check
  1. At least half Done.

Extended teaching notes

Why this lesson matters

Use this lesson to strengthen systems you own: understand the risk, practise safely in a lab, then write and apply the fix.

Apply the fix across stacks

Same class of bug, same idea in every language.

Java / Spring Boot

Parameterise queries, encode output, CSRF tokens, limited Actuator, dependency scanning.

ASP.NET Core

EF Core / parameterised SQL, Razor encoding, HTTPS, Data Protection.

Node.js / Express

helmet, parameterised SQL, npm audit, avoid eval and shell concat.

Python / Django / Flask / FastAPI

ORM, autoescape, pip-audit, Bandit; never shell=True with user input.

PHP / Laravel

PDO/Eloquent, Blade escaping, composer audit.

Go / Ruby

database/sql placeholders / ActiveRecord; html/template / ERB escaping; govulncheck / Brakeman.

nginx / Apache / Tomcat

Hide versions, TLS, security headers, least-open ports.

MySQL / PostgreSQL / MongoDB / Redis

Private networks, auth on, least-privilege users, no 0.0.0.0/0.

AWS / Azure / GCP

Roles not long-lived keys, private data stores, cloud audit logs on.

Mini case study

Suppose we are on a purple-team exercise for an Indian mid-size company (sample data). Red notes a technique from this lesson against a lab clone. Blue must show the control that stops it, the log that would have fired, and the ticket that hardens production. That is the standard this course trains you for.

Defender's worksheet (do this today)

  1. Write the lesson title, date and the exact lab target you are allowed to use.
  2. List three owned systems (VMs, apps, or cloud accounts) where this lesson applies.
  3. Run one safe check from the lesson on a lab system only. Paste the command and output.
  4. Write a two-sentence fix you would give a teammate.
  5. Name one related public advisory (CERT-In, CISA, NVD, or a vendor bulletin) with its date.

Indian workplace (sample data)

Suppose we are a junior analyst at Infosys, TCS, Wipro or a fintech SOC in Bengaluru/Pune. Turn this lesson into one checklist item with an owner, a due date and a place to store evidence (ticket + screenshot).

Global practice

Compare your notes with OWASP, CIS Benchmarks, NIST CSF/IR guidance or a cloud Well-Architected security question. Write five lines on what overlaps.

Everyday analogy

Explain the risk and the fix to a family member without jargon. If they can repeat the warning, you understand it well enough to teach juniors.

Key terms

  • Control: a safeguard (patch, config, process, detection).
  • Finding: a weakness backed by evidence.
  • Remediation: the fix plus how you verified it.
  • Scope: systems you have written permission to touch.
  • Least privilege: only the access the task needs.
  • Defence in depth: several layers so one failure does not end the story.

Common mistakes

  • Skipping written permission "just for a quick scan".
  • Practising on hostel, office or public targets without authorisation.
  • Collecting tool output without writing the fix.
  • Copying attack steps onto production to "verify". Defenders verify with versions, configs and patches.
  • Publishing screenshots that contain secrets, cookies or internal hostnames.

Recap

  • Evidence, fix, owner, date.
  • Own lab only.
  • Fix > spectacle.