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Computer Science · May / June 2026 · Paper 11 · Question 6

0478

As printed in the paper

The question as text

Web pages need to be located and retrieved to be displayed on a device.

Read automatically from the paper; the printed page above is exact.

Show the answer and mark scheme

  • 6(a)[5]

    One mark for each correct term in the correct place.

    domain name server (DNS)
    IP address
    web browser
    request
    hypertext markup language(HTML)

    The user types the URL into the address bar. The web browser sends the domain name from the URL to the domain name server (DNS). This searches for the matching IP address and sends this back to the web browser. The web browser sends a request to the web server for the web page. The web server then sends the data for web page back to the web browser. The web browser renders the hypertext markup language (HTML) to display the web page.

  • 6(b)[5]

    Five from, one mark for each correct section of the diagram.

    Web browser sending a request to the web server for its (digital) certificate/to identify itself
    Web server sending (digital) certificate to the web browser
    Web browser authenticating/validating the (digital) certificate …
    … showing the data sent if it is valid // showing data not sent if it isn’t valid
    The data is encrypted // Encryption is used …

    … using public and private keys // using asymmetric encryption

    … to make any data sent meaningless
    The web browser uses the public key to encrypt the data
    The web server uses the private key to decrypt the data

    For example:

    Request for digital certificate

    web

    web Sending digital certificate

    browser

    server If digital certificate is authentic,

    Authenticates the

    data is encrypted and sent.

    digital certificate

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