MCQs

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1. What is a Pre-Shared Key (PSK) mainly used for in networking?
   a. Authentication and encryption between two parties who have shared the key in advance
   b. DNS resolution
   c. Data warehousing
   d. Email verification
   Answer: a. Authentication and encryption between two parties who have shared the key in advancewikipedia+1
2. Which type of encryption do PSK-based systems typically use?
   a. Symmetric key encryption
   b. Asymmetric key encryption
   c. Hashing only
   d. Steganography
   Answer: a. Symmetric key encryptionnexusgroup+1
3. Where is PSK commonly used for Wi-Fi?
   a. WEP and WPA/WPA2-PSK
   b. 802.1X only
   c. NFC systems
   d. Fiber optic links
   Answer: a. WEP and WPA/WPA2-PSKportnox+1
4. What is the main security requirement when distributing a PSK?
   a. Confidential transfer to all parties
   b. Print the key in open documentation
   c. Share via social media
   d. Use the same key for all networks
   Answer: a. Confidential transfer to all partiesforcepoint+1
5. Which of these statements is correct about PSKs used in VPNs?
   a. Both gateways use the same PSK to create a hash and authenticate each other
   b. Only the server holds the PSK
   c. PSK is never hashed for authentication
   d. PSKs are not used in VPNs
   Answer: a. Both gateways use the same PSK to create a hash and authenticate each otherstonesoft+2
6. What is the risk if a PSK is exposed to unauthorized parties?
   a. The data becomes vulnerable
   b. Data is self-encrypted
   c. PSK is regenerated automatically
   d. Risk is mitigated by endpoint devices
   Answer: a. The data becomes vulnerablenexusgroup+2
7. How can the security of a PSK be improved?
   a. Using a long and random key
   b. Sharing the key freely
   c. Embedding the key in the firmware
   d. Writing the key on physical devices
   Answer: a. Using a long and random keyforcepoint+2
8. In wireless networks, WPA2-PSK is designed for which environment?
   a. Personal/home use without enterprise authentication servers
   b. Only enterprise networks
   c. Government classified networks
   d. Cellular networks
   Answer: a. Personal/home use without enterprise authentication serversexamradar+2
9. What should administrators do periodically for PSK security?
   a. Renew the PSK
   b. Leave the key unchanged forever
   c. Publish the key regularly
   d. Reduce key length over time
   Answer: a. Renew the PSKstonesoft+1
10. Which protocol replaced PSK-based authentication with Simultaneous Authentication of Equals (SAE)?
    a. WPA3
    b. WPA2
    c. EAP-TLS
    d. PPTP
    Answer: a. WPA3testbook
11. What information is involved in generating a PSK during wireless setup?
    a. SSID and passphrase
    b. Hostname only
    c. MAC address only
    d. DNS suffix
    Answer: a. SSID and passphrasedoctorengenius.engeniustech
12. What is Dynamic Pre-Shared Key (DPSK)?
    a. Per-user, unique passphrase-based key for secure network access
    b. Static key for all users
    c. Key issued only to routers, not clients
    d. Temporary key updated every minute
    Answer: a. Per-user, unique passphrase-based key for secure network accessruckusnetworks
13. Why is PSK favored in IoT device communication?
    a. Simplicity and low computational requirements
    b. Requires high infrastructure cost
    c. Needs certificate authorities
    d. Only usable in wired networks
    Answer: a. Simplicity and low computational requirementsnexusgroup
14. Which step occurs during a four-way handshake in WPA2-PSK?
    a. Generation of a pairwise transient key (PTK)
    b. Key is sent in plaintext
    c. Session is closed immediately
    d. MAC addresses are encrypted only
    Answer: a. Generation of a pairwise transient key (PTK)sanfoundry+1
15. What format can a PSK take?
    a. Passphrase, password, or hexadecimal string
    b. MAC address exclusively
    c. Only QR code
    d. Fingerprint scan only
    Answer: a. Passphrase, password, or hexadecimal stringwikipedia+1
16. What’s the most common length requirement for WPA2-PSK passphrases?
    a. 8-63 characters
    b. 4-8 characters
    c. Over 128 characters
    d. Exactly 12 characters
    Answer: a. 8-63 charactersdoctorengenius.engeniustech
17. What does EAP-PSK refer to?
    a. An EAP method utilizing PSKs for authentication
    b. Encryption key rotation
    c. MAC address filtering
    d. Wi-Fi roaming technique
    Answer: a. An EAP method utilizing PSKs for authenticationwikipedia
18. What is a security flaw of short or simple PSKs?
    a. Vulnerability to brute-force attacks
    b. Causes network lag
    c. Increases network throughput
    d. Enables faster roaming
    Answer: a. Vulnerability to brute-force attacksforcepoint+1
19. Which VPN type frequently uses PSKs for site-to-site configuration?
    a. IPsec VPN
    b. PPTP VPN
    c. SSL VPN
    d. SSTP VPN
    Answer: a. IPsec VPNsmoothwall+2
20. Which key is used to ultimately encrypt all traffic between a wireless client and AP after WPA2-PSK setup?
    a. Pairwise Transient Key (PTK)
    b. Public Key
    c. Static IP
    d. SSID
    Answer: a. Pairwise Transient Key (PTK)sanfoundry+1
21. What should always be avoided when selecting a PSK?
    a. Any pattern or easy-to-guess value
    b. Completely random hexadecimal
    c. Daily rotation
    d. Non-ASCII input
    Answer: a. Any pattern or easy-to-guess valuewikipedia
22. What is a common danger if PSKs are the same across multiple devices or sites?
    a. Compromise at one site can lead to global exposure
    b. Enhanced security only
    c. Requires more certificates
    d. Improved compatibility
    Answer: a. Compromise at one site can lead to global exposurenexusgroup+1
23. What does the PSK provide during initial handshake in Wi-Fi security?
    a. Basis for deriving session keys
    b. Direct encryption without session keys
    c. Public key for AP only
    d. Routing information only
    Answer: a. Basis for deriving session keysdoctorengenius.engeniustech+1
24. Which of the following best mitigates PSK compromise risk?
    a. Using individual PSKs per client or device
    b. Using a single PSK for all clients
    c. Changing SSID daily
    d. Disabling Wi-Fi encryption
    Answer: a. Using individual PSKs per client or devicecisco+1
25. What is the key advantage of PSK for smaller businesses?
    a. Simple, cost-effective secure communications
    b. Requires PKI infrastructure
    c. Complexity in setup
    d. High administrative overhead
    Answer: a. Simple, cost-effective secure communicationsnexusgroup
26. Which key is NOT derived directly from the PSK in WPA2?
    a. Group Temporal Key (GTK)
    b. Pairwise Transient Key (PTK)
    c. Master Session Key (MSK)
    d. MAC key
    Answer: a. Group Temporal Key (GTK)sanfoundry
27. What method can increase the strength of a PSK for wireless security?
    a. Mix of uppercase, lowercase, numbers, and symbols
    b. Simple dictionary word
    c. Short length
    d. Spaces only
    Answer: a. Mix of uppercase, lowercase, numbers, and symbolsstonesoft+1
28. What is the relationship between the SSID and the PSK in WPA2?
    a. SSID and passphrase are used together to generate the PSK
    b. SSID alone is the PSK
    c. Passphrase alone is PSK
    d. SSID is random, unrelated to keys
    Answer: a. SSID and passphrase are used together to generate the PSKdoctorengenius.engeniustech
29. Which scenario is NOT appropriate for using a PSK?
    a. Large enterprise environments needing user-level access control
    b. Small home or SOHO network
    c. IoT deployments with limited resources
    d. Temporary hotspot for guests
    Answer: a. Large enterprise environments needing user-level access controlportnox+1
30. What does WPA2-PSK rely on for user authentication?
    a. Possession of the shared key
    b. Individual user credentials
    c. Digital certificates only
    d. Hardware token
    Answer: a. Possession of the shared keyportnox+1
31. What type of attack is always theoretically possible against a PSK?
    a. Brute force key space search attack
    b. Denial-of-Service attack only
    c. Replay attack exclusively
    d. Distributed Hash Table flooding
    Answer: a. Brute force key space search attackwikipedia
32. What is recommended when transferring PSKs to new devices?
    a. Use secure management or out-of-band channels
    b. Transfer over unencrypted email
    c. Announce key publicly
    d. Use SMS text message
    Answer: a. Use secure management or out-of-band channelsaws.amazon+1
33. What happens if a PSK is changed but some devices still use the old key?
    a. Those devices cannot authenticate
    b. They remain on the network
    c. Network speed increases
    d. They can still see encrypted traffic
    Answer: a. Those devices cannot authenticatejuniper+1
34. In PSK-based Wi-Fi, what is the risk of key reuse among many users?
    a. Easier for attackers to capture and re-use the key
    b. Enhanced monitoring only
    c. Reduced setup time
    d. Secure user-level isolation
    Answer: a. Easier for attackers to capture and re-use the keyruckusnetworks+1
35. Which of the following is a modern improvement over classic PSKs?
    a. Dynamic PSK (per-user unique keys)
    b. Longer SSID length
    c. IPv6 only networks
    d. Lower encryption bitrates
    Answer: a. Dynamic PSK (per-user unique keys)cisco+1
36. What simplifies PSK management in large-scale VPN environments?
    a. Automated secret storage and distribution systems
    b. Manual entry only
    c. End-user choosing their key
    d. Using PSK as email password
    Answer: a. Automated secret storage and distribution systemscloud.google+1
37. How can session keys be derived in WPA2-PSK?
    a. Four-way handshake using PSK and nonces
    b. Direct static assignment
    c. Browser extension
    d. Voice recognition
    Answer: a. Four-way handshake using PSK and noncessanfoundry+1
38. What is a major limitation of PSK in multi-user enterprise environments?
    a. Lack of individual accountability and revocation
    b. Overly complex setup
    c. Incompatibility with Wi-Fi clients
    d. Requires frequent password change
    Answer: a. Lack of individual accountability and revocationportnox+1
39. What makes PSK a prudent choice for certain IoT solutions?
    a. Low computational overhead and implementation simplicity
    b. Mandatory PKI support
    c. Always included in OS
    d. Unbreakable by any means
    Answer: a. Low computational overhead and implementation simplicitynexusgroup
40. In PSK authentication for site-to-site VPNs, what is crucial to management?
    a. Regularly updating the PSK for all sites
    b. Assigning the same key everywhere
    c. Publishing to public repositories
    d. Using visible ASCII only
    Answer: a. Regularly updating the PSK for all sitessmoothwall+1
41. What determines the confidentiality in a cryptosystem using a PSK?
    a. The secrecy and randomness of the key
    b. Wi-Fi channel number
    c. Device’s MAC address only
    d. The client operating system
    Answer: a. The secrecy and randomness of the keyforcepoint+1
42. What is a common naming convention for Wi-Fi PSK security in home routers?
    a. WPA2-Personal
    b. WPA2-Enterprise
    c. WPA3-Enterprise
    d. EAP-FAST
    Answer: a. WPA2-Personalportnox+1
43. What is one way attackers can attempt to discover a PSK?
    a. Brute-forcing based on dictionary or random guesses
    b. Changing the SSID
    c. Viewing public DNS records
    d. Monitoring DHCP leases
    Answer: a. Brute-forcing based on dictionary or random guessesforcepoint+1
44. What is a key management challenge associated with PSKs?
    a. Secure distribution and periodic rotation
    b. Lack of support for IPv6
    c. Overly complex user interfaces
    d. Expensive licensing
    Answer: a. Secure distribution and periodic rotationforcepoint+1
45. What is likely the biggest risk if a shared PSK is never changed in an environment with high turnover?
    a. Former users may retain unauthorized access
    b. Increased network speed
    c. All users are automatically logged out
    d. New users are generated
    Answer: a. Former users may retain unauthorized accessruckusnetworks+1
46. What can organizations do to mitigate PSK sharing risks?
    a. Use per-device or per-user dynamic keys
    b. Share one key widely
    c. Disable Wi-Fi encryption
    d. Rely on MAC filtering only
    Answer: a. Use per-device or per-user dynamic keyscisco+1
47. In which situation is using a PSK the least secure?
    a. Large public or guest networks
    b. Small home office network
    c. Single-device IoT setup
    d. Isolated test lab
    Answer: a. Large public or guest networkswikipedia+1
48. What is a passphrase used for in WPA2-PSK?
    a. Input that’s processed with the SSID to generate the PSK
    b. Direct key used for all traffic
    c. Only a user label
    d. Password for router administration
    Answer: a. Input that’s processed with the SSID to generate the PSKdoctorengenius.engeniustech
49. What is the principal difference between PSK and enterprise authentication (802.1X)?
    a. PSK uses a shared secret, enterprise uses per-user authentication with a server
    b. PSK requires a certification authority
    c. Enterprise authentication shares a single password
    d. 802.1X is only for home users
    Answer: a. PSK uses a shared secret, enterprise uses per-user authentication with a serverportnox
50. What protocol specifically supports private PSK assignment per device?
    a. Private Pre-Shared Key (PPSK)
    b. HTTP
    c. SMTP
    d. DHCP
    Answer: a. Private Pre-Shared Key (PPSK)ruckusnetworks+1

1. https://en.wikipedia.org/wiki/Pre-shared_key
2. https://www.nexusgroup.com/what-are-pre-shared-key-encryption-algorithms/
3. https://www.portnox.com/cybersecurity-102/wpa-psk/
4. https://help.forcepoint.com/ngfw/en-us/6.10.100/GUID-2A1BC042-3AFE-4794-B738-BEAA94922B58.html
5. https://help.stonesoft.com/onlinehelp/StoneGate/SMC/6.7.0/GUID-2A1BC042-3AFE-4794-B738-BEAA94922B58.html
6. https://aws.amazon.com/blogs/networking-and-content-delivery/aws-site-to-site-vpn-secure-pre-shared-key-psk-management-with-aws-secrets-manager/
7. https://examradar.com/basics-of-wireless-networks-and-wi-fi-mcqs/
8. https://testbook.com/question-answer/which-wireless-security-protocol-provides-the-high–6891dfee70498e22f4f1252c
9. https://doctorengenius.engeniustech.com/en/articles/6708681-what-is-a-pre-shared-key-psk
10. https://www.ruckusnetworks.com/technologies/RUCKUS-Security-Innovations/Dynamic-Pre-Shared-Key-PSK/
11. https://www.sanfoundry.com/computer-network-wireless-security/
12. https://kb.smoothwall.com/hc/en-us/articles/15301665774492-Example-IPsec-Site-to-Site-and-PSK-Authentication-Configuration
13. https://help.zscaler.com/zia/understanding-ipsec-vpns
14. https://techdocs.broadcom.com/us/en/symantec-security-software/web-and-network-security/cloud-swg/help/conn-matrix/conn-about-ipsec/vpn-psk-static.html
15. https://www.cisco.com/c/en/us/td/docs/wireless/controller/ewc/17-7/config-guide/ewc_cg_17_7/private_psk.pdf
16. https://www.juniper.net/documentation/us/en/software/mist/mist-wireless/topics/topic-map/preshared-keys.html
17. https://cloud.google.com/network-connectivity/docs/vpn/how-to/generating-pre-shared-key
18. https://ipcisco.com/lesson/pre-shared-key-psk/
19. https://www.watelectronics.com/mcq/wifi/
20. https://www.scribd.com/document/411485183/Cns-4-and-5-Unit-Mcqs