CPS- How web pages are located, retrieved and displayed

User opens URL in web browser

Web browser will send URL to DMS

Web browser will send URL to DNS

DNS will search for IP address

DNS will search for IP address

Is the IP found?

Is the IP found?

YES: it sends IP address back to web

NO: web browser sends URL to a new DNS

YES: It sends IP address back to web browser

NO: web browser sends URL back to a new DNS

Web browser sends request to web browser

Web browser sends request to web browser

Asks for web page from website through protocol

Asks for webpage from website through protocol

If protocol is Http:

•Web server sends script back to web browser

•Web browser renders active script to display webpage

If protocol is Https:

•Web browser requests digital certificate from web server

•Web server sends copy of digital certificate to web browser

•Web browser checks if digital certificate is authentic

If protocol is Https:

•Web browser requests digital certificate from web server

•Web server sends copy of digital certificate to web browser

•Web browser checks if digital certificate is authentic

If it is authentic:

•Web browser allows communication to continue with web server. Any data transmitted between them is encrypted.

•Web server sends script back to display web page

If not authentic:

•Web browser will report that website is not secure.