A company sells smartphones over the Internet. Explain how the information stored on the company's website is requested by the customer, sent to the customer's computer and displayed on the screen.

Mark scheme

Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.

1. Seven from: Requested ∞ a web browser is used ∞ user enters the URL / web address (into the address bar) // clicks a link containing the web address // clicks an element of the webpage ∞ the URL / web address specifies the protocol ∞ protocols used are Hyper Text Transfer Protocol (HTTP) / Hyper Text Transfer Protocol Secure (HTTPS) Sent ∞ the URL / web address contains the domain name ∞ the Internet Service Provider (ISP) looks up the IP address of the company ∞ the domain name is used to look up the IP address of the company ∞ the domain name server (DNS) stores an index of domain names and IP addresses ∞ web browser sends a request to the web server / IP address Received ∞ Data for the website is stored on the company's web server ∞ webserver sends the data for the website back to the web browser ∞ web server uses the customer's IP address to return the data ∞ the data is transferred into Hyper Text Mark-up Language (HTML) ∞ HTML is interpreted by the web browser (to display the website)