{"id":268,"date":"2020-02-24T10:22:43","date_gmt":"2020-02-24T10:22:43","guid":{"rendered":"http:\/\/learnlearn.uk\/alevelcs\/?page_id=268"},"modified":"2021-03-08T05:57:58","modified_gmt":"2021-03-08T05:57:58","slug":"client-server-side-scripting","status":"publish","type":"page","link":"https:\/\/learnlearn.uk\/alevelcs\/client-server-side-scripting\/","title":{"rendered":"Client & Server Side Scripting"},"content":{"rendered":"
\n

Serving Web Pages<\/h2>\n
\n\n

How web pages are served<\/h3>\n

Web pages are served using a server – client relationship.<\/p>\n

    \n
  1. The user enters the URL of the website\/web-page to be loaded into a web browser. The browser looks in the computer’s DNS cache to see if a matching IP address is stored.
    \nIf none is found then a request is sent to the ISP’s DNS resolver server to find out the IP address (NOT Found \u2192 step 2, found \u2192 step 4).<\/span><\/li>\n
  2. The DNS resolver looks for the IP address and if it is stored the DNS Server returns the IP address to the originator.<\/span><\/li>\n
  3. If it is not found it is passed on to a higher level DNS. Once found the original DNS caches the IP address for future use and returns the IP address to the user.<\/span><\/li>\n
  4. The browser uses the IP address to send the web page request to the web server.<\/span><\/li>\n
  5. The web server retrieves the page and sends it to the originator.<\/span><\/li>\n
  6. The browser interprets the script and loads the page.<\/li>\n<\/ol>\n

    Tutorial Video<\/h3>\n

    Can’t access YouTube? Click Here for the Google Drive version.<\/a><\/p>\n