0/7 is a summary, 00:54:40, Nullo Notice that the route is shown to be a part of a larger network (in this case, 192.168.1.0). We know this because the host route is indented under the major network. The router will attempt to show you which classful (major) network contains the route. If the router knows about only a single subnet mask, it will assume the network has been divided equally with that mask. In this case, the router has assumed that the major network 192.168.1.0/24 has been equally subnetted, with each subnet having a /32 mask. Hence, the natively /24 network 192.168.1.0 is shown as 192.168.1.0/32. The IP Routing Table Subnet Subnets are indented under their source major networks. In our example, the major network 172.16.0.0/16 has been subnetted; in fact, it has been subnetted under the rules of Variable Length Subnet Masks (VLSM), which allow each subnet to have a different subnet mask (within certain limits-see Chapter 34 for more detail). The route in the middle that is not in bold is a summary route, which I'll cover next: 172.16.0.0/16 is variably subnetted, 6 subnets, 2 masks 172.16.200.0/23 is a summary, 00:56:18, Nullo 172.16.200.0/24 is directly connected, Loopback2 172.16.201.0/24 is directly connected, Serialo/o 172.16.202.0/24 is directly connected, Loopback3 172.16.100.0/23 is directly connected, Loopback4 172.16.101.0/24 [90/2172416] via 11.0.0.1, 00:53:07, FastEtherneto/1 10.0.0.0/8 is directly connected, FastEtherneto/o 11.0.0.0/8 is directly connected, FastEtherneto/1 192.168.1.0/32 is subnetted, 1 subnets 192.168.1.11 [90/156160] via 11.0.0.1, 00:00:03, FastEtherneto/1 0.0.0.0/0 [1/0] via 11.0.0.1 10.0.0.0/7 is a summary, 00:54:40, Nullo Summary (Group of Subnets) The term summary is used in the routing table to represent any group of routes. Tech- nically, according to the Cisco documentation, a summary is a group of subnets, while a supernet is a group of major networks. Both are called summaries in the routing table. Thus, while the example routing table shows two summary entrie