Lesson 4.9.4.1

4.9.4.1 TCP/IP Quiz: AQA Computer Science, Unit 9

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.9.4.1, TCP/IP: 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. Which layer is at the very top of the TCP/IP protocol stack?

    • Link layer
    • Network layer
    • Application layer
    • Transport layer

  2. Which layer is responsible for routing packets across networks?

    • The link layer
    • The network layer
    • The transport layer
    • The application layer

  3. Which TCP/IP stack layer manages end-to-end communication and port numbers?

    • Transport layer
    • Application layer
    • Link layer
    • Network layer

  4. Which layer of the TCP/IP stack uses MAC addresses to transmit network frames locally?

    • Transport layer
    • Link layer
    • Application layer
    • Network layer

  5. Which two identifiers combine to form a network socket endpoint?

    • Subnet and mask
    • URL and gateway
    • IP address and port
    • MAC and SSID

  6. What does a MAC address uniquely identify?

    • Network interface card
    • Domain Name Server
    • Global internet host
    • TCP port number

  7. What are well-known ports in the TCP/IP stack used for?

    • Temporary client connections
    • Standard network services
    • Router hardware addresses
    • Dynamic IP assignment

  8. What type of port assignment characterises client ports in a network connection?

    • Fixed standard assignment
    • Temporary dynamic assignment
    • Hardware MAC mapping
    • Static server reservation

  9. A browser uses client port 49152 to connect to web server port 80. Which port is well-known?

    • Port 80
    • Port 49152
    • Both ports
    • Neither port

  10. Which protocol is used by web browsers to request and receive unencrypted web pages?

    • FTP
    • HTTP
    • POP3
    • SMTP

  11. A user's email is sent using SMTP. Which protocol is used to retrieve it later from the mail server?

    • FTP
    • POP3
    • SSH
    • HTTPS

  12. Which protocol is used to securely log in to a remote computer and execute commands?

    • SSH
    • FTP
    • HTTP
    • SMTP

  13. Which protocol is primarily used by an email server to send emails to another server?

    • SMTP
    • HTTPS
    • IMAP
    • POP3

  14. What process does a web browser perform to visually display retrieved HTML resources on screen?

    • Decrypting
    • Rendering
    • Encapsulating
    • Compiling

  15. Which application-layer protocol is used for secure remote management and logging in to a remote computer?

    • POP3
    • SSH
    • SMTP
    • HTTP

  16. A TCP/IP stack has four layers. When an application sends a message, through how many layers does the data pass on its way down the stack?

    • Three
    • Five
    • Four
    • Two

  17. What does a port number identify when combined with an IP address in a socket?

    • A MAC address
    • A physical device
    • A specific process
    • A network interface

  18. Which standard application layer protocol uses well-known port 443?

    • FTP
    • SSH
    • HTTPS
    • HTTP

  19. A packet is sent between two devices on the same local network using their hardware addresses. Which layer uses these addresses?

    • The link layer
    • The transport layer
    • The application layer
    • The network layer

  20. What term describes adding protocol headers to data as it moves down the TCP/IP stack?

    • Fragmentation
    • Compilation
    • Decapsulation
    • Encapsulation

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