IP addresses in a particular subnet will be its range. Each subnet will start with an IP address and end at some IP address.Means there will be 2^15 hosts in a subnet and there will be two subnets.
So, total 15 bits are available for subnetting. Here, 7 bits are available for subnetting in 3 rd octet and 8 bits are available in 4 th octet. Number of Hosts per Subnets = 2^No of non-subnetted bits (No of Zeros) So, we will get 2 subnets from /17 but what about hosts?.And we don’t even have to change the Network. That means if we use /17 subnet mask (255.255.128.0), it will create 2^1=2 sub-networks. That means No of subnetted bits = 17-16=1. Why?īecause IP address that we are using here belongs to Class B and default CIDR Value of Class B is 16. Number of subnets = 2^no of subnetted bits Use the same formulas that we applied in previous class. That will be 172.35.0.0 (because in class B two octets are reserved for networks and two for hosts.) First, check what will be network address of this IP Address. There are 4 main things to consider in subnetting. We have 32-16=16 bits in which we can do subnetting. Let’s take a class B IP address first- 172.35.10.0/16. Subnetting, as we have already discussed in our previous post, is one of the most important topic in CCNA. We have already discussed how to create a sub-network from a single network address? Now, let’s take a look at subnetting of class B IP address.
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