Week 08 - World Wide Web Analysis 1 (L21-L25)

Question 1

What are proxy servers?

Answer 1

Intermediary servers that sits between requesting client and webserver. A proxy server can have different functions: caching, site filter, access control, hide internal ips

Question 2

What is AJAX?

Answer 2

Asynchronous Javascript and XML. It is used to load new content of a website in a way, that only part of a web pages will be refreshed and not entire site.

Question 3

What is Web 2.0?

Answer 3

Dynamic content of web pages.

Question 4

Describe Obfuscation? What are common obfuscation techniques?

Answer 4

Obfuscation: write data in a form that it is not easy to read.

• user based encoding
• %based encoded UR
• Minor spelling issues (Misspelled)
• Replace letters with numbers (Homographic)

Question 5

Name three sources of page content?

Answer 5

static, dynamic, forwarding

Question 6

How does encrpytion works in WWW?

Answer 6

HTTP + TLS

Question 7

What are cookies? What are the fields stored in a cookie?

Answer 7

Cookies are small text file that are store on the clients maschine. Normally saved as a text file, new browsers save in SQLlite databases. Mainly used to make stateless HTTP connection stateful by tracking user activities. Can save:

• Login credentials / User control
• User activities
• User settings on websites
• Maintaining session state

Question 8

What is WWW?

Answer 8

stands for world wide web. It’s the well documented part of the internet.

Question 9

What are the two standard authentication scheme of HTTP?

Answer 9

Basic: Uses base64 encoding;

Digest: Uses message digest

Question 10

What is HTTPS?

Answer 10

HTTP plus TLS für encrypted end-to-end connection from client to webserver

Question 11

Explain the HTTP status codes: 1xx, 2xx, 3xx, 4xx, 5xx

Answer 11

• 1xx: Informational
• 2xx: Success
• 3xx: Redirection
• 4xx: Client Errors
• 5xx: Server Errors

Question 12

What is an URI? And what is difference to URL?

Answer 12

URI = Uniform Resource Identifier: Used to identify a resource.

URL = Uniform Resource Location => https://www.mysite.com/startpage.html

Question 13

How does Tunneling By Proxy works?

Answer 13

Proxy acts as intermediary server between client and web server. All requests go via Proxy server to the internet and all answers come back to proxy. Proxy distributes answers to internal clients again. Clients send CONNECT to Proxy, not a GET command.

Question 14

What are the three core protocols of the WWW?

Answer 14

URI, http, html

Question 15

What is HTTP? What are common HTTP commands?

Answer 15

HyperText Transfer Protocol: protocol used for web traffic; get, post, delete, put, head