To find its right subnet (subnet ID), router performs the bitwise ANDing of destination IP Address mentioned on the data packet and all the subnet masks one by one. Then, Routing table maintained by the internal router looks like: The IP Address of the 4 subnets are: 200.1.2.0 (Subnet a) Route Determination Process (finding Subnet ID using Routing Table):Ĭonsider a network is subnetted into 4 subnets as shown in the above picture. Tables for static network devices do not change unless a network administrator manually changes them. Dynamic routing tables allow devices to “listen” to the network and respond to occurrences like device failures and network congestion. In dynamic routing, devices build and maintain their routing tables automatically by using routing protocols to exchange information about the surrounding network topology. These Routing tables can be maintained manually or dynamically.
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