1. Concept of Basic Electrical and Electronics Engineering

2. Digital Logic and Microprocessor (AExE02)

3. Programming Language and Its Application

4. Computer Organization and Embedded System (ACtE04)

5. Concept of Computer Network and Network Security System ACtE05)

6. Theory of Computation and Computer Graphics (ACtE06)

7. Data Structures and Algorithm, Database System and Operating System (ACtE07)

8. Software Engineering and Object-Oriented Analysis & Design (ACtE08)

9. Artificial Intelligence and Neural Networks (ACtE09)

10. Project Planning, Design and Implementation (AALL10)

COMPLETE NOTES -ALL TOPIC

MEMORY BASED QUESTIONS

5.6 Network security

1. The main goal of network security is to:
A. Prevent unauthorized access
B. Increase data redundancy
C. Improve bandwidth
D. Reduce latency
Answer: A. Prevent unauthorized access

 

2. Which of the following is not a type of network attack?
A. Phishing
B. SQL Injection
C. Encryption
D. Denial of Service
Answer: C. Encryption

 

3. A firewall operates mainly at which layer of the OSI model?
A. Network layer
B. Physical layer
C. Transport layer
D. Data Link layer
Answer: A. Network layer

 

4. Which of the following ensures data confidentiality?
A. Encryption
B. Compression
C. Firewall
D. Caching
Answer: A. Encryption

 

5. Which encryption technique uses two keys—one public and one private?
A. Symmetric encryption
B. Asymmetric encryption
C. Hashing
D. Steganography
Answer: B. Asymmetric encryption

 

6. The process of converting plaintext into ciphertext is called:
A. Encoding
B. Decoding
C. Encryption
D. Decryption
Answer: C. Encryption

 

7. SSL and TLS protocols are used to provide:
A. Secure communication over the Internet
B. File transfer services
C. Email delivery
D. Domain name resolution
Answer: A. Secure communication over the Internet

 

8. What does VPN stand for?
A. Virtual Private Network
B. Virtual Public Network
C. Verified Private Network
D. Virtual Packet Network
Answer: A. Virtual Private Network

 

9. Which of the following is used to detect unauthorized access or anomalies in a network?
A. IDS (Intrusion Detection System)
B. DNS
C. SMTP
D. FTP
Answer: A. IDS (Intrusion Detection System)

 

10. Which protocol is used for secure file transfer over the Internet?
A. FTP
B. SFTP
C. HTTP
D. SNMP
Answer: B. SFTP

 

11. Which algorithm is commonly used for symmetric encryption?
A. RSA
B. DES
C. DSA
D. Diffie-Hellman
Answer: B. DES

 

12. The technique of hiding secret data inside another file is called:
A. Cryptography
B. Steganography
C. Phishing
D. Spoofing
Answer: B. Steganography

 

13. Which of the following best describes a DoS attack?
A. Stealing passwords
B. Overloading a system to make it unavailable
C. Intercepting data packets
D. Encrypting data for secure transfer
Answer: B. Overloading a system to make it unavailable

 

14. Digital signatures are mainly used for:
A. Authentication and integrity
B. Confidentiality
C. Compression
D. Error correction
Answer: A. Authentication and integrity

 

15. Which of the following is a strong password?
A. 123456
B. password123
C. ezexpln@2025#Net
D. admin
Answer: C. ezexpln@2025#Net

 

16. What is the main purpose of a proxy server?
A. Hide user identity and cache web content
B. Increase download speed
C. Translate web pages
D. Control hardware usage
Answer: A. Hide user identity and cache web content

 

17. Which protocol provides security for email communication?
A. SMTP
B. POP3
C. PGP (Pretty Good Privacy)
D. IMAP
Answer: C. PGP (Pretty Good Privacy)

 

18. Which of the following is a physical security measure?
A. Firewall
B. Password
C. CCTV surveillance
D. Antivirus software
Answer: C. CCTV surveillance

 

19. Which key management technique is used in symmetric cryptography?
A. Single shared key
B. Public-private key pair
C. Digital certificate
D. Hash function
Answer: A. Single shared key

 

20. Which of the following is not a common cybersecurity goal?
A. Confidentiality
B. Integrity
C. Availability
D. Simplicity
Answer: D. Simplicity