Unit 4: Email, Cloud & Cyber Security
Chapter 22: Email
Hinglish Explanation: Email me sender, recipient, subject, body aur attachments ho sakte hain.
- To = primary recipient; CC = visible copy; BCC = hidden copy.
- Attachment adds a file to the message.
- Spam is unwanted bulk communication.
- Phishing emails try to trick users into revealing information or clicking malicious links.
Chapter 23: Cloud Computing
English Definition: Cloud computing provides computing resources such as storage, processing and software over a network on demand.
Hinglish Explanation: Cloud me resources local computer ke bajay remote data centers se Internet/network ke through milte hain.
| Model | Provides | Example concept |
|---|---|---|
| IaaS | VMs/storage/network | Infrastructure |
| PaaS | App platform | Development environment |
| SaaS | Ready software | Web application |
Trick:
SaaS provides ready-to-use software (like Google Docs). IaaS provides raw infrastructure.
SaaS provides ready-to-use software (like Google Docs). IaaS provides raw infrastructure.
Chapter 24: Cyber Security Fundamentals
- CIA triad: Confidentiality, Integrity, Availability.
- Authentication verifies identity (Who are you?); authorization determines permissions (What can you access?).
- Least privilege gives only required access.
Simplified Security Chain
Chapter 25: Malware
Hinglish Explanation: Virus, worm, trojan, ransomware, spyware etc. malware ke forms hain.
| Malware | Key idea |
|---|---|
| Virus | Attaches/replicates via host |
| Worm | Self-spreads across networks |
| Trojan | Disguised as legitimate program |
| Ransomware | Locks/encrypts data & demands payment |
| Spyware | Secret monitoring/data theft |
Chapter 26: Phishing, Spoofing & Social Eng.
- Phishing: deceptive messages/links.
- Spear phishing: targeted phishing.
- Smishing: SMS-based phishing.
- Vishing: voice-call phishing.
- Spoofing: impersonates an address, identity, website or communication source.
📝 SSC Practice MCQs (Unit 4)
SSC CGL
Q1. Which protocol is commonly used to send email?
Answer: A. SMTP
Solution: SMTP (Simple Mail Transfer Protocol) is used for sending email.
Solution: SMTP (Simple Mail Transfer Protocol) is used for sending email.
SSC CHSL
Q2. Which malware can self-propagate across networks?
Answer: A. Worm
Solution: A worm can replicate and self-propagate across networks without needing a host file (unlike a virus).
Solution: A worm can replicate and self-propagate across networks without needing a host file (unlike a virus).
SSC MTS
Q3. Which attack commonly uses deceptive messages and links?
Answer: A. Phishing
Solution: Phishing is a social engineering attack that uses deceptive emails/messages to steal user data.
Solution: Phishing is a social engineering attack that uses deceptive emails/messages to steal user data.
SSC CPO
Q4. Which cloud model provides ready-to-use software?
Answer: C. SaaS
Solution: SaaS (Software as a Service) provides ready-to-use applications over the internet (e.g., Google Workspace).
Solution: SaaS (Software as a Service) provides ready-to-use applications over the internet (e.g., Google Workspace).
SSC Selection Post
Q5. What does MFA improve?
Answer: A. Authentication security
Solution: MFA (Multi-Factor Authentication) requires multiple forms of verification, greatly improving authentication security.
Solution: MFA (Multi-Factor Authentication) requires multiple forms of verification, greatly improving authentication security.