book ccna exam canada

book ccna exam canada.Configuring EIGRP Using Wildcard MasksEIGRP's network command syntax without a wildcard mask (as shown in Example 10-1) may be exactly the syntax an engineer wants to use, or it may prove to be a somewhat clumsy approach. For example, if an engineer wants to enable EIGRP on G0/0,not G0/1, and they both have IP addresses in class A network 10.0.0.0,the network 10.0.0.0EIGRP subcommand will match both interfaces, not just G0/0.I0S also has a second EIGRPnetwork command option, which uses a wildcard mask to allow engineers to match exactly the correct interface IP address they want to use. In this case, the network command does not have to list the classed network number. Instead, if the address and wildcard mask in the network command are part of an access control list (ACL), the IOS will match the interface IP address that matches the ACL. The logic is like an ACL address and wildcard mask, similar to the address/mask logic in the OSPFnetwork command discussed in Chapter 8.For example, revisiting Figure W-1, router R3's IP addresses are distributed across three subnets: 10.1.3.0/24, 10.1.4.0/24, and 10 chariot 6.0/24.Example 10-2 shows an alternate EIGRP configuration for router R3 that uses a single network command to match the address range for each of R3's three connected subnets. Because the subnet mask is /24, each network command uses 0.0.0.255 as the wildcard mask and the subnet ID of one of R3's interfaces as the address parameter.Example 10-2 Using a Wildcard Mask in an EIGRP ConfigurationR3(config)# router eigrp 1R3(config-router)# network 10.1.3.00.0.0.255 R3(config-router)# network 10.1.4.00.0.0.255 R3(config-router)# network 10.1.6.00.0.0.255Alternatively, R3 can match each interface by using the wildcard mask 0.0.0.0 command to list the specific IP address of each interface. For example, the network 10.1.3.3 0.0.0.0 command will match R3's LAN interface address 10.1.3.3,on which EIGRP O is enabledVerifying EIGRP Core FeaturesSimilar to OSPF, EIGRP uses three tables to match its three main logical blocks: a neighbor table, a topology table, and an IPv4 routing table. But even before EIGRP attempts to build these tables, the I0S must connect the configuration logic to its local interface. Once EIGRP is enabled on an interface, the router can begin building its three tables.