Sunday, February 5, 2012

Cisco ICND1 Flashcard: Static Routing

Use of Static Routes
When the network is small and there are few routers, a network administrator can program static routes to set the path from one LAN to another. In a small network, this results in more security because routing table updates don't have to be sent over the network periodically because things won't change!

usage: ip route network-address-destination subnet-mask-remote-network ip-address of next hop router or exit-interface

Default Static Route
A default static route allows a stub network to reach all known networks beyond the next hop router.   It is useful when the route from source to destination is not known or there are just too many routers to name. This is the perfect setting for the edge router of a company reaching to the ISP network.
 conf t
usage: ip route 0.0.0.0 0.0.0.0 ip-address or the exit-interface
This can be imagined as the gateway of the last resort.

Dynamic Routes
Dynamic routers use a route that a network protocol adjusts automatically for topology or traffic changes. The protocols could include IGRP, RIP, EIGRP, OSP and EGP to name a few.
Confirm, but I believe you use the command
router rip to configure the routing protocol, just like that.

Verify the Routes
usage: show ip route
The output will list the path to networks the router knows by identifying S for a static route and the exit-interface, or a C for directly connected network. The reason it lists the exit-interface rather than the next hop router ip address is to supply the maximum information in a single lookup.

No comments:

Post a Comment