Lesson 1.3.3a

1.3.3a Network characteristics, protocols, TCP/IP, DNS and protocol layering Quiz: OCR Computer Science, Unit 3

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 1.3.3a, Network characteristics, protocols, TCP/IP, DNS and protocol layering: 20 multiple choice questions for the OCR Computer Science (H446), Unit 3: Exchanging data, written with Revision Ninja.

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The 20 questions

  1. Which TCP/IP layer handles end-to-end communication, error checking, and port numbers?

    • Application layer
    • Link layer
    • Transport layer
    • Internet layer

  2. Which protocol is responsible for retrieving email and keeping it synchronized across multiple devices?

    • IMAP
    • HTTP
    • POP3
    • SMTP

  3. What does the abbreviation DNS stand for in computer networking?

    • Dynamic Naming System
    • Domain Name Server
    • Domain Name System
    • Digital Network Service

  4. Which layer of the TCP/IP stack adds MAC addresses to data frames?

    • Application layer
    • Internet layer
    • Transport layer
    • Link layer

  5. Which connectionless Transport layer protocol prioritises speed over reliable data delivery?

    • IP
    • FTP
    • UDP
    • TCP

  6. Which protocol automatically assigns dynamic IP addresses to devices on a network?

    • NAT
    • DHCP
    • DNS
    • ARP

  7. Which protocol is used to transfer web pages securely using encryption?

    • HTTP
    • HTTPS
    • SSH
    • FTP

  8. Which TCP/IP layer is responsible for routing packets across different networks using IP addresses?

    • Internet layer
    • Link layer
    • Transport layer
    • Application layer

  9. A web browser sends a request to port 80. Which protocol is being used?

    • FTP
    • SMTP
    • HTTPS
    • HTTP

  10. What is added to data at each layer as it moves down the TCP/IP stack?

    • Digital signature
    • Encryption key
    • Data payload
    • Protocol header

  11. What type of address uniquely identifies a network interface card at the hardware level?

    • IP address
    • Port number
    • URL
    • MAC address

  12. Which network architecture model splits communication tasks into four distinct modular layers?

    • TCP/IP stack
    • OSI model
    • Peer-to-peer model
    • Client-server model

  13. A user enters a web address into a browser. Which server provides the matching IP address?

    • Proxy server
    • DHCP server
    • DNS server
    • Web server

  14. Which email protocol downloads messages to a local device and deletes them from the server?

    • POP3
    • SMTP
    • IMAP
    • SNMP

  15. Which protocol is specifically used by email clients to send messages to a mail server?

    • SMTP
    • IMAP
    • HTTP
    • POP3

  16. Which network parameter measures the time delay for a data packet to reach its destination?

    • Jitter
    • Latency
    • Bandwidth
    • Throughput

  17. What happens to a network packet if its Time To Live counter reaches zero during routing?

    • It is returned
    • It is dropped
    • It is encrypted
    • It is duplicated

  18. Which process describes wrapping data with protocol headers as it descends through network layers?

    • Encapsulation
    • Segmentation
    • Decapsulation
    • Abstraction

  19. Which standard port number is reserved for secure HTTPS traffic?

    • Port 443
    • Port 25
    • Port 21
    • Port 80

  20. Which protocol is used specifically to transfer files between a client and server on a network?

    • DHCP
    • SNMP
    • FTP
    • SMTP

All OCR Computer Science quizzes