World wide web architecture

Question 1

What are the 3 most important protocols of the web?

Answer 1

URI - Uniform resource identifier
HTTP
HTML

Question 2

Where does the page content of a webpage come from?

Answer 2

• Reads from files on disk
• Generates on the fly (dynamically) using another program
• Forwards HTTP request to another server

Question 3

Why do most proxy servers exist?

Answer 3

To reduce internet traffic and user response time through caching. Caching proxies retain copies of frequently requested web resources

Question 4

What are some uses of proxy servers?

Answer 4

• Reduce internet traffic through caching
• Used to control access from intranet to internet
• Used to conceal identity

Question 5

What does a web server retain in most cases?

Answer 5

• A log file with requests that it receives and how it responded to those requests.
• Proxies can also maintain similar logs

Question 6

What does web 2.0 refer to?

Answer 6

Websites that contain more than just static pages

Question 7

What does Ajax do?

Answer 7

Allows the browser to request some content from the web server without the need to reload the entire page