s, only the first is technically a summary route: 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 The last entry in the routing table, which is also reported as a summary, is a group of major networks and is technically a supernet. Chapter 9: Routing and Routers The differentiation between supernets and summary routes is primarily an academic one. In the real world, both are routinely called summary routes or aggregate routes. Different routing protocols use different terms for groups of routes, be they subnets or major networks-BGP uses the term "aggregate," while OSPF uses the term "summary." The destination for both summary routes is Nullo. Nullo as a destination indicates that packets sent to this network will be dropped. The summary routes point to Nullo be- cause they were created within EIGRP on this router. The Nullo route is there for the routing protocol's use. The more specific routes must also be included in the routing table because the local router must use them when forwarding packets. The specific routes will not be advertised in the routing protocol; only the summary will be advertised. We can see this if we look at an attached router: 172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks 172.16.200.0/23 [90/156160] via 11.0.0.2, 04:30:21, FastEtherneto/1 172.16.202.0/24 [90/156160] via 11.0.0.2, 04:30:21, FastEtherneto/1 172.16.100.0/23 [90/156160] via 11.0.0.2, 04:30:21, FastEtherneto/1 172.16.101.0/24 is direc