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EIGRP Passive Interface EIGRP does not send any hello messages on the passive interface. EIGRP router ignores any EIGRP messages received on the interface which means no neighbors relation but EIGRP still advertises about the connected subnet only if matched with an EIGRP network command. let's understand it more clearly In our diagram, we have 4 Routers and a switch, Router_1 and Router_2. Down side there’s the network 10.1.1.1/8 with a switch connected to Router_1 and come computers. We need Router_1 to advertise the network 10.1.1.1/8 to our Autonomous system and of course router_2 but we have one problem there is no router on the 10.1.1.1/8 network. There is no reason to send EIGRP hello packets on the interface FastEthernet 0/0 There is also one big problem it’s a security risk if someone connects his computer to our switch with an application that advertises fake routes and becomes EIGRP neighbors with our router1 this is a nightmare. We do not...

  The default route is used by IP to forward any packet with a destination not found in the routing table, which is why it is also called the gateway of last resort. Also, it can be used at an end location where there is only one exit path for any destination (internet). We can also use the default routes for better network performance. How? For example, our routers on the access layer do not need to know all our routes in our Autonomous system. When we use a default route, we can significantly reduce the size of our router routing table and surely improve our network performance on the access layer.  Default routes help in reducing the size of your routing table. It’s the least preferred route in the routing table. Let's see the configuration: Topology:  EIGRP DEFAULT ROUTE CONFIGURATION                                          ...

  EIGRP name mode operates the same way as EIGRP classic mode. EIGRP name mode provides one place for all configurations. Since IOS 15, EIGRP has had a new method of configuration called mode EIGRP.  When we use the classic EIGRP version, before IOS 15, we configured EIGRP globally and a few other things like authentication on interfaces, but with named mode EIGRP, we can do everything globally   In EIGRP name mode, we can create a single instance of EIGRP. Topology: Task configure the topology as pr the diagram  assign IP addresses to their interfaces as per our topology  configure EIGRP IPv4 name mode. R1(config)#Interface fastethernet 0/0 R1(config-if)#Ip address 10.1.1.1   255.0.0.0 R1(config-if)#No shutdown R1(config-if)#No keepalive R1(config-if)#Exit R1(config)#Interface serial 3/0 R1(config-if)#Ip address  1.1.1.1 255.0.0.0 R1(config-if)#No shut...