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Hello everyone my name is vijay kumar Devireddy and i am glad to have you back on my episode 55 today we are discussing about Subnetting.Subnetting is the act of creating subnetworks logically through the manipulation of IP addresses.So if I take a large chunk of IPs,like a 256 block, I can break it down into four blocks of 64 IPs,or eight blocks of 32 IPs, however you want to break it down in your subnetting,which you learned back in Network Plus.Now, subnetting has some benefits to our network. First, it allows us to more efficiently use the IP address space that we've been given,and it's going to reduce the broadcast traffic and the number of collisions,because there's less hosts on any given network.But it also can increase our security by making our networks more compartmentalized and allows them to be in smaller sections.Any time information wants to go from one subnet to another,it has to be routed through. And that gives us an additional place to place access control lists and other things to our router to give us additional security.Now, you can use subnets to help secure your network by doing a couple of different things.First, you want to assign different policies to each subnet.For example, I might have a subnet that's associated with my printers,and those have different policies than the ones associated with my servers,and those have different policies than the ones associated with my office workers' desktop computers. Each of those can have different policies for each subnet. Also, you want to be able to monitor all of your subnets and check the traffic that's going into and out of them.By using subnets, we can help isolate an attack, as well,because all traffic has to be routed before it can enter or exit a subnet.And therefore, if somebody breaks into say,the secretary's computer, they're going to be trapped in that subnet, unless they have permission to go into some of the other more secured subnets that we have out there.Each time it goes through a router again,it's going to be checked by the access control list, and that secretary's laptop may not have access to the database server, for example,which has more confidential and secured information.So they're going to be limited in what they can do once they've broken in.