Answer / darshana

Client server is a 2-tier application. In this, front end
or client is connected to
'Data base server' through 'Data Source Name',front end is
the monitoring level.


Web based architecture is a 3-tier application. In this,
browser is connected to webserver through
TCP/IP and webserver is connected to Data base
server,browser is the monitoring level.
In general, Black box testers are concentrating on
monitoring level of any type of application.



All the client server applications are 2 tier
architecutures.
Here in these architecutre, all the "Business Logic" is
stored in clients and "Data" is stored in Servers. So if
user request anything, business logic will b performed at
client, and the data is retrived from Server(DB Server).

Here the problem is, if any business logic changes, then we
need to change the logic at each any every client.

The best ex: is take a super market, i have braches in the
city. At each branch i have clients, so business logic is
stored in clients, but the actual data is store in servers.
If assume i want to give som discount on som items, so i
need to change the business logic. For this i need to goto
each branch and need to change the business logic at each
client. This the disadvantage of Client/Server
architecture.

So 3-tier architecture came into picture:

Here Business Logic is stored in one Server, and all the
clients are dumb terminals. If user requests anything the
request first sent to server, the server will bring the
data from DB Sever and send it to clients. This is the flow
for 3-tier architecture.

Assume for the above. Ex. if i want to give som discout,
all my business logic is there in Server. So i need to
change at one place, not at each client. This is the main
advantage of 3-tier architecture.

Answer / swati

venky,

darshan is not clear, he is not specific about the
technology used in the eg he has considered. i wish he does
it for us to discuss more

if its web based den we could go for browser based else
we could go for .exe installation on clients we could use
remote logins to connect to the server. do correct me if i
am wrong. I wish someone throw highlight on thin or thick
client concept of client server architecture.

regds,
swati
swty79@rediffmail.com

Answer / murali

hi guys

environment means a group of hardware components with some
basic software which can hold business logic,presentation
logic,database logic.

client server application is two tier architecture,one tier
is for client machine and one tier is for database server.
Each client machine contains business logic and presentation
logic and database logic is placed in a database server.
whenever the clients need to share a common data this type
of application is useful.but no security for business logic.

Web application is a 3 tier architecture.one tier is for
client,one tier is for application server,one tier is for
database server.presentation logic is stored in client
machine,business logic is stored in application
server,database logic is stored in database server.
whenever the application is used by worldwide with limited
no of users.Here business logic is full secured and we can
easily update the business logic.

For unlimited users we go for n tier architecture i.e.,
distributed environment

Answer / venky

In the example taken by Darshan(i.e Supermarket) for the
client Server application how do u connect to the server?

Do an .exe or any other application is to be installed in
the client m/c to connect the server

or can we connect to the server using a browser from the
client m/c

pls clarify

Answer / swati

hi

i want to add to dharshana's answer....
the tier has nothing to do with client/server or web
application. we can go for 2-tier in web application too
like fetching of static html pages from server. so plz dont
not use all client.server applications are two tier. one of
my project is a client server application built on n-tier
architecture...that is the business logic on server is
spilt into many units...i wish viewers tooo add to this
answer.

regds,
swati, swty79@rediffmail.com

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