Web Science
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| Home | Part1: Foundations of the web | Part2: Emerging Web properties | Part3: Web & society | Flipped Classroom | Enroll | About the Web Science MOOC |
Course elements
- PART1: Block1: Ethernet · Internet Protocol · Block2: Transmission Control Protocol · Domain Name System · Block3: Internet vs world wide web · HTTP · Block4: Web Content Block5: Dynamic Web Content
- PART2:
- PART3:
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Introduction (0th week)
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Web Science/Part1: Foundations of the web
Lessons
- understand the basic problems when communicating over a shared medium
- understand the origins of ethernet
- be able to name the ethernet header fields
- be able to explain the reason for the preamble
- understand that the cable length has an influence to transfer rate
- understand that speed of light is responsible for the connection between cable length and transfer rate
- be able to calculate the maximum cable length for a given transfer rate
- understand that the cable length is part of the Ethernet protocol
- Understand that Ethernet is a non deterministic program
- Be able to reconstruct a collision detection / resolve algorithm
- Understand what happens if two computers send data at the same time
- get introduced to the concept of an IP-network
- understand that networks can be interconnected
- learn about the importance for decentralization as a design principle
- realize that Local area networks can be fragmented via IP networks
- understand that an IP network as an overlay network is an abstract thing that is not directly reflecting the hardware settings
- understand the notion of an IPv4 address and its components like network and host part
- understand why MAC addresses do not fulfill the requirements of IP addresses.
- get introduced to the notion of an IP router / gateway
- review the definition and concept of an IP network
- understand that IP routing works on the level of IP networks
- understand the concept of subnetting
- review network classes and understand classless inter domain routing.
- get a feeling for the IP header
- get a better understanding of how the protocol works
- understand which header fields are changed while routing
- understand which problems of IP will be solved with the transmition control protocol
- be aware of the limitations of the internet protocol and the internet architecture
- get to know the end to end principle and in which only sender and receiver take care that communication works properly
- understand the concept of a logical connection (virtual communication channel) between two computers on the internet
- understand the importance of acknowledging received messages
- be able to understand the process of establishing a tcp / connection
- understand the concept of a socket in a TCP/IP package
- understand that ports are part of the TCP header
- be able to explain the difference between solicited and unsolicited TCP/IP traffic
- understand how ports can be used for multiplexing internet connections
- understand the concept of windowsize and sliding window
- understand how flow controll can prevent TCP connections to overload link layer protocols and slow networks
- In this lesson you will learn some basics on the Question: Why Web Content needs structure and proper markup.
- Understand the Domain Object Model and the DOM tree
- Understand that HTML is just a special dialect of XML
- Understand the relationship between HTML and XML
- Be able to write simple HTML code having learned a few example elements of HTML (headings, paragraphs, lists, tables, links, anchors, emphasize, input fields; but also few dirty ones like italics, color,...)
- See that HTML really is just another simple mark up and has nothing to do with programming
- Be able to structure web Content using HTML and create pages following a specified structure.
- Know about the style attribute and how to use it within HTML elements
- Know already realize that there are some limits using the style attribute
- be able to create websites that follow a certain style guide
- See the problems with inline styles
- Understand that a style sheet gives you freedom
- being able to explain people why they should use style sheets
- be able to name at least 2 important point why to use style sheets
- know how the cascading process works
- know the basic syntax of cascading stylesheets
- know how to include a media file like a graphic to your webpage.
- understand that images like jpg, gif and bitmaps are hard for machines to understand.
- Know how to use a XML based format to create images that are easy to understand for machines and humans an can even make use of stylesheets.
- Understand that metadata is necessary to communicate the semantics of content
- See that using metadata for ranking in search results is a bad idea
- get introduced to modern ways of publishing media data as RDFa
- Understand the separation between content, structure, layout and meta data
- Review HTML, CSS, XML, SVG and RDFa
- Understand what makes a clean HTML markup ("separation of concerns") vs. unclean one ("mixing responsibilities"); and implications (better or worse maintenance, better or worse personalization, better or worse accessibility)
- become aware of the possibilities to create dynamic content within a webserver
- see that you don't have to implement a webserver to be able to serve dynamic content
- understand some main issues like blocking I/O that one should keep in mind when doing server side programming
- see how the web server is the entry point for web applications
- whitelisting of input vs blacklisting and a method of preventing XSS
- understand the basics of HTTP POST requests
- become aware of security issues while transfering data to a web server
- be able to create a simple web form in HTML
- See how a POST request is handled in a Java Servlet
- get to know the Request object
- see how a data base query and more advanced technology can be included to a servlet
- understand how javascript was supposed to support people to fill out web forms
- understand the issues and disadvantages that arise with javascript
- be aware of JavaScript APIs
- know some of the standard JavaScript libraries
- be able to understand the concept of Ajax requests.
