Questions about switch

a layer 2 switch is the switch you probably learned about if you have done anything with networking, it remembers where IP's are located on the network and transfers data to the known IP without broadcasting, thus helping keep down network congestion. A layer 3 switch is closer to being a router, but it isn't exactly one so you can't use it that way. It still does all the things the layer 2 switch does. It's more expensive but can offer better security because it works at the network level instead of just the data link level. As far as what's good for what, it is easier to say what your application is and us go from there. If this is a home network or small business, a switch in general is more than necessary. If you're setting up a network for a large company (hopefully not and asking us questions like these) then the layer 3 would be beneficial.
 
does it mean i can use layer3 switch instead of layer2 switch to increase the security of network, but more money are needed to pay? will layer 3 switch be used in normal secondary school?
 
In my opinion, layer 3 is probably more than you need, but if you want to spend the extra bucks, there's more security stuff it does than a layer 2, but you'll have to figure out how to set them up
 
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