LAN is created only by dlink normal switch

HI all professionals.
In my company all the network is created by cascading the normal 12 or 24 ports switches.For around 150 computers, is it the right way to create a network. Or we need to change something in this for make it better.

Munish,
Ideally no - this is not a good way of doing it, as you are creating 1 very large broadcast domain, which can be counter-productive.
I would suggest you consider actuallu purchasing "Switches" and consider a 3 layer model:-
Access (users connect to this)
|
Distribution (the access layer switches are aggregated here - & possibly some dynamic routing)
|
Core (where everything comes to, perhaps you just have layer 3 interfaces here)
I suggest you read the below design guides to get an idea of what you can do!
http://www.cisco.com/en/US/netsol/ns742/networking_solutions_program_category_home.html
HTH>

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