W3C Website?

I had never heard aboutthe W3C site until our last class... W3C is a web application that validates sites. It is a good validation service however not a good way to debug html. All you have to do is enter the url, and the document type from the drop down and if you see the green line saying congratulations, that means it has passed the standard requirements for that doc type. If not, you will see a list of errors. Some of the errors that we saw in class were:
1-Pars Mode error: This is when the Doc command is missing. Doc type needs to be specified before the htmal tag.
2-No character encoding found: This means that we need to have the correct css doc. It can be fixed by putting a meta tag. Meta tag itself means info about info....Information about structure on how it is stored (data). In html we out that in head and start with meta...Example: You can put things like keywords,author name etc.
3- Alt tags need to be error: If another application cant read the doc, then it needs the alt tag. Alternatively if the picture got deleted, then words would show up on the page. A classic example for this is Internet spiders. Some other application exaple can be for blind people, which reading(audio) the text is used rather than displaying.

OSI Model-7 layers

In our last class, we were introduced to the seven layers of the OSI model (Open System Interconnection Reference Model ). It was a neat way to learn it because we got into different groups and each group got to research and introduce their layer. Our group was responsible for the application layer. This layer is the closest layer to the end user and acts like a service layer. One example can be name resolution. For example, we remember "google" by its name, not by it's ip address....it a nutshell it Provides access to the network for applications.

Here is a short description for the other 6 layers:
Physical (Layer 1)
Defines the physical structure of the network.
Data-link (Layer 2)
Provides error detection and correction.

Network (Layer 3)
Provides the method which data can be passed from one network system to another.
Transport (Layer 4)
Provides connection services between the sending and receiving devices and ensures reliable data delivery.
Session (Layer 5)
Coordiantes the data exchange between applications on separate devices.

Presentation (Layer 6)
Formats data from the application layer into a format that can be sent over the network.

Welcome to my Blog!!!!

Hello and Welcome to my Blog! This blog has been set up for the MIST 7500 Course. I will be posting a few blogs weekly and will share some of the material that I learn in my Introduction to JAVA course. Thanks for visiting!