Web Science/Part1: Foundations of the web/Domain Name System/DNS address resolution

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Web Science/Part1: Foundations of the web

Web Science/Part1: Foundations of the web/MoocIndex

Web Science/Part1: Foundations of the web/Domain Name System/DNS address resolution

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DNS address resolution

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1 What is the difference between a forward and a reverse lookup

	The used transport layer protocol is different
	Forward lookups turn domain names to ip addresses
	Forward lookups turn ip addresses to domain names
	Reverse lookups turn ip addresses to domain names
	Reverse lookups turn domain names to ip addresses

2 Will all forward queries for domains be issued to a root server?

	Yes
	No

3 What is a problem that occurs when ISPs cache address resolution answers

	There is no problem
	The cache might get outdated
	Inconsistency might arise
	DNS stops to be a hierarchical protocol
	Caching and spreading results is prohibited in some countries due to copy right violations

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1. Ethernet
   1. Communication over a shared Medium
   2. Ethernet header
   3. Minimum package length vs maximum cable length
   4. Collision detection
   5. Summary, further reading, homework
2. Internet Protocol
   1. Motivation for IP
   2. Classful IPv4 networks
   3. IP forwarding algorithm
   4. IP header
   5. Summary, further reading, homework
3. Transmission Control Protocol
   1. End to end principle and connection oriented communication
   2. Three way handshake
   3. Port numbers
   4. Sliding window and flow control
   5. Summary, further reading, homework
4. Domain Name System
   1. Tree structure
   2. Terminology
   3. Zones
   4. Review some facts about DNS
   5. Delegating DNS queries
   6. DNS address resolution
   7. Summary, further reading, homework
5. Internet vs World Wide Web
   1. Summary of the internet architecture
   2. Motivation and requirements for the World Wide Web
   3. Design principles of the web
   4. Uniform Resource Identifier
   5. Summary, further reading, homework
6. Hypertext Transfer Protocol
   1. Making HTTP requests
   2. A simple web client
   3. A simple web server
   4. HTTP header
   5. Content negotiation
   6. Summary, further reading, homework
7. Web content
   1. Problem setting for web content formats
   2. Working with XML
   3. HTML for web document structures
   4. Layout elements in HTML
   5. Motivating separation of content and layout
   6. Cascading Style Sheets
   7. Media content
   8. Metadata
   9. Summary, further reading, homework
8. Dynamic Web Content
   1. Basics of server side web programming
   2. Forms and HTTP post request
   3. Handling a post request in a Java Servlet
   4. Client side JavaScript
   5. Ajax and the XMLHttpRequest class
   6. Summary, further reading, homework

Delegating DNS queries

Summary, further reading, homework