A Talk on System Architecture

Chat with childhood friend, who has recently joined a B school !!!!!!!!!! 

Me: Hey Rashi u there??

Rashi: Hey hi, long time... :)

Me: Yup, u really got busy in your new MBA college... : P

Rashi: Huh.. I am getting too frustated, so many things to take care off... so many assignments, clubs, committees, don't know what to do. And today I got assignment on System Architecture too.. :(.. I don't know how will I manage all this.. :(

Me:  Hey, don't worry, u will manage everything as u are going to be the manager in next two years.. :P
For the assignment part may be I can help. I will help you out with the concepts.

Rashi: That would be so great... :)

Me: First you need to understand the two basic entities of the information system, data and application.
System architectures main principle says that data must be largely distinct with the application.

Rashi: ok.

Me: System architecture is of numbers of types:
       1). Single tier
       2). Two tier
       3). Three tier
       4). Multi tier

Rashi: huh.. again so many things... :S

Me: Don't worry, they are pretty easy... :) Starting with

        SINGLE TIER ARCHITECTURE
 
Single tier system consist both data and application in same hardware. e.g. Laptops and desktops.

         
       
              TWO TIER ARCHITECTURE
 It is also called client server architecture. It consists of data on server and the application on                                          
 individual machines. It is better for graphics user interface. It works on LAN. The disadvantage is if
a number of users are present the system will slow down.

Rashi: Hey they both look so easy.. thanks dear.... :)

Me: Now the things become a bit complex, but you will grab them too ;)

          THREE TIER ARCHITECTURE

In three tier architecture, data remains at the server, however the application is partitioned,where the business logic kept centrally and presentation logic kept on the individual machines. In this the data
transfer is minimized.They work on WAN.

              FOUR TIER ARCHITECTURE

This is based on internet which is similar to WAN in three tier architecture. This is inexpensive but
insecure as internet is public, so no need for specialized software at client location but the business
application needs to be web enabled. As internet is public and insecure try to have some level of
security such as firewall.

Rashi: Hmm, now I could get some insight thanks dear this will help me a lot in completing the assignment.

Me: My Pleasure, go ahead if you have any queries, I am just a ping away.. :D. Prepare it well and do show assignment to me as well.... ;) Gd nyt tc... :)

Rashi: sd.. :)