MCQs

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1. What is the existence of weakness in a network system called?
   a. Attack
   b. Exploit
   c. Vulnerability
   d. Threat
   Answer: c. Vulnerabilitysanfoundry
2. Which attack overwhelms network resources to make them unavailable to users?
   a. Injection
   b. Man-in-the-Middle
   c. Denial of Service
   d. Phishing
   Answer: c. Denial of Servicestudocu
3. An attacker who intercepts communication between two parties to eavesdrop or alter data is performing what type of attack?
   a. Sniffing
   b. Phishing
   c. Man-in-the-Middle
   d. Ransomware
   Answer: c. Man-in-the-Middlestudocu
4. What is the main vulnerability in using default network configurations?
   a. Reduced performance
   b. Increased attacks
   c. Reliability issues
   d. Increased vulnerability
   Answer: d. Increased vulnerabilityqaautomation
5. Which common vulnerability exploits weak authentication systems?
   a. Misconfiguration
   b. Brute force
   c. Social engineering
   d. Unpatched software
   Answer: b. Brute forceinspirisys
6. Which vulnerability involves an attacker injecting malicious packets into network traffic?
   a. DoS
   b. Session hijacking
   c. Spoofing
   d. Injection attack
   Answer: d. Injection attackstudocu
7. Which protocol is vulnerable to ARP spoofing?
   a. DNS
   b. ARP
   c. FTP
   d. HTTP
   Answer: b. ARPgeeksforgeeks
8. Exploiting open network ports due to firewall misconfigurations can lead to:
   a. Packet loss
   b. Unauthorized access
   c. Network segmentation
   d. Performance boost
   Answer: b. Unauthorized accesscobalt
9. What vulnerability occurs when weak passwords are used?
   a. Authentication weakness
   b. Protocol misconfiguration
   c. Traffic overload
   d. Data redundancy
   Answer: a. Authentication weaknessinspirisys
10. Which network threat involves sending malicious code through a web application?
    a. DNS spoofing
    b. XSS
    c. Phishing
    d. Worm
    Answer: b. XSSvinsys
11. Failure to update system software can result in:
    a. Lower risk
    b. Enhanced integrity
    c. Unpatched vulnerabilities
    d. Better compatibility
    Answer: c. Unpatched vulnerabilitiescobalt
12. What vulnerability arises from using unsecured Wi-Fi access points?
    a. Reliable access
    b. Opportunity for sniffing
    c. Enhanced security
    d. Network isolation
    Answer: b. Opportunity for sniffingcobalt
13. Which describes a buffer overflow attack?
    a. Overflowing input buffers
    b. Encrypting data
    c. Setting strong passwords
    d. Disabling firewalls
    Answer: a. Overflowing input buffersiscalepro
14. What risk is present if a firewall is set with overly permissive rules?
    a. High bandwidth
    b. Security gaps
    c. Fast throughput
    d. Strong encryption
    Answer: b. Security gapsinspirisys
15. Which protocol sends credentials in plain text, thus vulnerable to interception?
    a. HTTPS
    b. FTP
    c. SSH
    d. SFTP
    Answer: b. FTPgeeksforgeeks
16. What is the impact of DNS cache poisoning?
    a. Faster lookups
    b. Redirects users to malicious sites
    c. Caches passwords
    d. Avoids IP assignment
    Answer: b. Redirects users to malicious sitesgeeksforgeeks
17. A common characteristic of phishing attacks is:
    a. Encryption
    b. Social engineering
    c. Firewall use
    d. Port scanning
    Answer: b. Social engineeringcobalt
18. Which attack involves flooding a server with SYN packets?
    a. SYN flood
    b. Phishing
    c. Sniffing
    d. Brute force
    Answer: a. SYN floodvinsys
19. Which tool is commonly used to scan networks for vulnerabilities?
    a. MS Paint
    b. Wireshark
    c. Nmap
    d. WordPad
    Answer: c. Nmapgtu-mcq
20. What is the most common cause of a misconfigured firewall?
    a. High memory
    b. Lack of updates
    c. Overly complex rulesets
    d. Use of VPN
    Answer: c. Overly complex rulesetscobalt
21. Allowing unnecessary network services can lead to:
    a. Efficiency
    b. Increased attack surface
    c. Less resource use
    d. Performance gain
    Answer: b. Increased attack surfaceinspirisys
22. Which type of vulnerability scanner is used on networks for identifying weaknesses?
    a. Antivirus
    b. Nmap
    c. Text editor
    d. File compressor
    Answer: b. Nmapscribd
23. What type of protocol is susceptible to session hijacking?
    a. HTTP
    b. SMTP
    c. DHCP
    d. ARP
    Answer: a. HTTPgeeksforgeeks
24. What risk is associated with outdated authentication protocols?
    a. High CPU usage
    b. Increased vulnerability
    c. Efficient processing
    d. Lower storage
    Answer: b. Increased vulnerabilitycobalt
25. Using same passwords across multiple platforms causes:
    a. No effect
    b. Multi-point compromise
    c. Reduced security
    d. Isolation
    Answer: b. Multi-point compromiseinspirisys
26. Which vulnerability can result from improper VLAN configuration?
    a. VLAN hopping
    b. Packet filtering
    c. Port scanning
    d. Redundancy
    Answer: a. VLAN hoppingcobalt
27. What does a packet sniffer do?
    a. Blocks traffic
    b. Generates traffic
    c. Captures network packets
    d. Compresses data
    Answer: c. Captures network packetssanfoundry
28. Which configuration error can expose sensitive data in transit?
    a. Weak firewall
    b. No VPN
    c. Lack of encryption
    d. Closed ports
    Answer: c. Lack of encryptioncobalt
29. What attack is enabled by weak or absent input validation?
    a. SQL injection
    b. Firewalking
    c. Spoofing
    d. Routing attack
    Answer: a. SQL injectionstudocu
30. What is the primary purpose of a firewall?
    a. Accelerate network
    b. Prevent unauthorized access
    c. Compress data
    d. Manage switches
    Answer: b. Prevent unauthorized accessuninets
31. Which network device can segment traffic to reduce risk of attacks?
    a. Hub
    b. Router
    c. Switch
    d. Repeater
    Answer: c. Switchsanfoundry
32. Which form of DoS attack targets control points of the network?
    a. Vulnerability attack
    b. Bandwidth flooding
    c. SQL injection
    d. DNS redirection
    Answer: a. Vulnerability attacksanfoundry
33. Which form of MitM targets HTTPS and steals session cookies?
    a. ARP spoofing
    b. Session hijacking
    c. DNS poisoning
    d. Port scanning
    Answer: b. Session hijackinggeeksforgeeks
34. What attack manipulates DNS records?
    a. DNS cache poisoning
    b. SYN flooding
    c. ARP ping
    d. IP spoofing
    Answer: a. DNS cache poisoninggeeksforgeeks
35. What should be done to avoid sniffing vulnerabilities in LANs?
    a. Use switched networks
    b. Use hubs
    c. Disable VLANs
    d. Lower bandwidth
    Answer: a. Use switched networkssanfoundry
36. Which vulnerability is linked to unpatched operating systems?
    a. Ransomware
    b. Update infection
    c. Outdated software
    d. Key logging
    Answer: c. Outdated softwarepurplesec
37. What impact does a backdoor in software have?
    a. Weak password
    b. Universal access
    c. Unauthorized access
    d. Packet loss
    Answer: c. Unauthorized accessinspirisys
38. What technique uses fake login screens to steal credentials?
    a. Sniffing
    b. Pharming
    c. Phishing
    d. Keylogging
    Answer: c. Phishingcobalt
39. Which protocol is highly vulnerable without encryption?
    a. SSH
    b. HTTPS
    c. HTTP
    d. FTPS
    Answer: c. HTTPgeeksforgeeks
40. Which scenario is an example of physical network vulnerability?
    a. Unlocked server room
    b. Closed ports
    c. VLAN tagging
    d. Firewall rules
    Answer: a. Unlocked server roominspirisys
41. Failure to change vendor default settings in network devices can cause:
    a. Enhanced performance
    b. Device compromise
    c. High throughput
    d. Fewer upgrades
    Answer: b. Device compromisecobalt
42. Which vulnerability scanner is open source?
    a. OpenVAS
    b. Nessus
    c. PuTTY
    d. CiscoWorks
    Answer: a. OpenVASscribd
43. Which method can help prevent brute force attacks?
    a. Weak passwords
    b. Account lockout policies
    c. Open gates
    d. Default ports
    Answer: b. Account lockout policiesinspirisys
44. Which attack results from attackers injecting malicious traffic into DHCP?
    a. DHCP starvation
    b. VLAN hopping
    c. Port scanning
    d. ARP poisoning
    Answer: a. DHCP starvationcobalt
45. What vulnerability allows remote execution of malicious code?
    a. Remote code execution
    b. Man-in-the-middle
    c. Packet replay
    d. Port filtering
    Answer: a. Remote code executioninspirisys
46. Disabling which feature can help reduce remote attacks?
    a. Remote management
    b. Port security
    c. VLAN tagging
    d. MAC filtering
    Answer: a. Remote managementcobalt
47. Which tool allows attackers to analyze and capture network traffic in real time?
    a. Wireshark
    b. Putty
    c. WinRAR
    d. SAP
    Answer: a. Wiresharkgtu-mcq
48. Which method assists in identifying vulnerabilities before exploitation?
    a. Penetration testing
    b. File scanning
    c. Service logging
    d. Bandwidth monitoring
    Answer: a. Penetration testingvinsys
49. What best practice helps mitigate vulnerabilities in wireless networks?
    a. Using strong WPA2/WPA3 encryption
    b. Default SSID
    c. Shared passwords
    d. Disabled firewalls
    Answer: a. Using strong WPA2/WPA3 encryptioninspirisys
50. What do social engineering vulnerabilities primarily target?
    a. People
    b. Routers
    c. Switches
    d. Cables
    Answer: a. Peoplecobalt

1. https://www.sanfoundry.com/1000-cyber-security-questions-answers/
2. https://www.studocu.com/en-au/messages/question/8186705/11describe-3-network-security-vulnerabilities-with-examples-minimum-15-words-each
3. https://qaautomation.expert/2025/03/04/multiple-choice-questions-for-security-testing-on-web-application/
4. https://www.inspirisys.com/blog-details/A-Comprehensive-Guide-to-Network-Security-Vulnerabilities/192
5. https://www.geeksforgeeks.org/blogs/14-most-common-network-protocols-and-their-vulnerabilities/
6. https://www.cobalt.io/blog/common-network-security-vulnerabilities
7. https://www.vinsys.com/blog/top-30-mcqs-ceh-exam-preparation
8. https://www.iscalepro.com/post/vulnerability-management-interview-questions/
9. https://gtu-mcq.com/BE/Computer-Engineering/Semester-5/3150714/1042/MCQs?q=9aZHDjblmRk%3D
10. https://www.scribd.com/document/488601324/Cyber-security-MCQ-NOTES
11. https://www.sanfoundry.com/computer-networks-mcqs-network-attacks/
12. https://www.uninets.com/blog/network-security-interview-questions
13. https://purplesec.us/learn/common-network-vulnerabilities/
14. https://testbook.com/objective-questions/mcq-on-network-security–5eea6a0939140f30f369d917
15. https://www.uninets.com/blog/computer-networks-mcq
16. https://www.yeahhub.com/top-20-frequently-asked-network-security-mcqs-with-answers/
17. https://cybertalents.com/blog/network-security-interview-questions-and-answers-complete-list
18. https://www.geeksforgeeks.org/ethical-hacking/vulnerabilities-in-information-security/
19. https://www.webasha.com/blog/20-real-world-cybersecurity-scenario-based-questions-for-cybersecurity-job-interviews-how-to-answer-like-a-pro
20. https://www.theknowledgeacademy.com/blog/cyber-security-mcq-and-answers/