Lesson 4.9.3.2

4.9.3.2 Internet security Quiz: AQA Computer Science, Unit 9

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.9.3.2, Internet security: 20 multiple choice questions for the AQA Computer Science (7517), Unit 9: Fundamentals of communication and networking, written with Revision Ninja.

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The 20 questions

  1. What feature does a packet-filtering firewall inspect to determine whether to allow traffic?

    • Packet header fields
    • Active connection state
    • Full payload content
    • User account passwords

  2. What type of server acts as an intermediary, making Internet requests on behalf of a client?

    • DHCP server
    • Proxy server
    • Stateful firewall
    • DNS server

  3. What does a stateful inspection firewall monitor to decide if incoming packets are permitted?

    • Active connection state
    • DNS server records
    • User login credentials
    • File checksum values

  4. How many distinct secret keys are used in symmetric encryption for both encryption and decryption?

    • Two distinct keys
    • A key pair
    • Three separate keys
    • One single key

  5. In asymmetric encryption, which key is used to decrypt a message encrypted with a public key?

    • A session token
    • The public key
    • The private key
    • A shared key

  6. What is the main security risk associated with key exchange in symmetric encryption systems?

    • High processing overhead
    • Key interception
    • Slow decryption speed
    • Public key exposure

  7. Which key is used to encrypt a symmetric session key during secure key exchange?

    • Shared symmetric key
    • Sender's private key
    • Recipient's private key
    • Recipient's public key

  8. What main role does a digital certificate serve in secure online communications?

    • Filters network traffic
    • Generates session keys
    • Encrypts raw data
    • Authenticates public keys

  9. What two security properties does a digital signature provide for a transmitted document?

    • Confidentiality and availability
    • Authenticity and integrity
    • Anonymity and speed
    • Redundancy and compression

  10. Which key does a recipient use to verify a digital signature created by the sender?

    • Sender's private key
    • Recipient's public key
    • Recipient's private key
    • Sender's public key

  11. What type of self-replicating malware spreads across networks without needing a host file?

    • Worm
    • Virus
    • Spyware
    • Trojan

  12. What type of malware tricks users by masquerading as a legitimate, harmless software application?

    • Rootkit
    • Virus
    • Trojan
    • Worm

  13. What protocol is commonly used to secure web traffic using certificates and encryption?

    • SMTP
    • HTTP
    • FTP
    • HTTPS

  14. Which vulnerability is most commonly exploited by a computer worm to spread?

    • Social engineering tactics
    • Software security flaws
    • Physical access breaches
    • Weak account passwords

  15. How does improved code quality reduce the threat of malware infections?

    • Encrypts network traffic
    • Authenticates remote users
    • Reduces software vulnerabilities
    • Blocks incoming ports

  16. Which cybersecurity technique detects malware by analysing system activities for unusual actions?

    • Behavioural monitoring
    • Digital signature verification
    • Packet filtering
    • Symmetric encryption

  17. Which type of firewall keeps track of active connections to allow inbound response traffic?

    • Proxy server
    • Stateful inspection
    • MAC filtering
    • Packet filtering

  18. If a message is encrypted with a recipient's public key, what decrypts it?

    • Sender's public key
    • Recipient's public key
    • Recipient's private key
    • Sender's private key

  19. What primary purpose does a digital certificate serve in asymmetric cryptography?

    • Generates symmetric keys
    • Encrypts payload data
    • Authenticates public keys
    • Compresses transmission files

  20. What can a basic packet filtering firewall NOT inspect when filtering network traffic?

    • Packet payload content
    • Destination port numbers
    • Source IP addresses
    • Protocol type headers

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