The total size of the network is 4*2⁸ i.e.
For any network to be aggregated it should follow three rules. There are some rules according to which the network can be aggregated. How does supernetting work?Īll the networks are not suitable for aggregation. Supernetting is used to reduce the size of the IP routing table to improve network routing efficiency. When the router has a big routing table then it takes a lot of time for the router to process the routing table. If there are lots of small networks then the size of the routing table increases. The routing table contains the entry of a subnet mask for every network. In this multiple smaller networks are combined together to form a large network. The range of IP address that lies in the 2nd subnet network is from 201.10.1.128 to 201.10.1.255. The range of IP address which is in 1st subnet network is from 201.10.1.0 to 201.10.1.127. If we want to divide it into four networks then we need 2 bits(2²=4 networks). Using 1 bit we can divide it into 2 networks i.e. If the leftmost bit of the host address is 0 then it is the 1st subnet network and if the leftmost bit is 1 then it would be 2nd subnet network. We are going to borrow the left-most bit of the host address and declare for identifying the subnet. In the above class C network, we have 24 bits for Network ID and the last 8 bits for the Host ID. So, in subnetting we will divide these 254 hosts logically into two networks. This is because the first IP address is for the network ID and the last IP address is Direct Broadcast Address(for sending any packet from one network to all other hosts of another network ). So the total number of hosts is 256(for class C host is defined by last octet i.e. Suppose we have a class C network having network ID as 201.10.1.0( range of class C 192–223). So if we divide this large network into the smaller network then maintaining each network would be easy. So to manage such a large number of hosts is tedious. Subnettingĭividing the network into smaller contiguous networks or subnets is called subnetting. In this blog, we will learn about these concepts in detail. This is done by IP subnetting and supernetting. Directly connected, dynamically learned, and local routes are ultimate routes.Computer networks can be broken into many networks or small networks can be combined to form large networks depending upon our needs. This route is called An ultimate route is a routing table entry that contains either a next-hop IPv4 address or an exit interface.
#Youtube.com subnet mask table serial
Serial 0/0/0 = Existing interface for this route. Each entry displays the classful network address, the number of subnets, and the number of different subnet masks that the classful address has been subdivided into. The routing table basically provides a heading for the specific subnets it contains. In the technical word, above mentioned route is called level 1 parent routes in the routing table of R1. Let understand the routing table to make easy the process:ġ0.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
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