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.
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!