| Recent
Articles |
Four Important Commands For Your CCNA / CCNP Home Lab
More CCNA and CCNP candidates than ever before are putting together their own home practice labs.
How to Install and Configure a Forum
Once you've built your website, you might like to offer your visitors an opportunity to interact with it, and to talk to you and each other without having to use email. Forums are absolutely ideal for this purpose.
PHPBB2: All It Can Be?
Please allow me to start off and say that I am very happy to run PHP software on my computer.
How And Why Switches Trunk
Your CCNA studies are going to include quite a bit of information about switches, and for good reason.
Sober Worm Algorithms Finnished
The scheme used by the virus writer behind the Sober worms to determine where it will connect on the Internet has been cracked by the Finnish security firm.
Web site IP Filtering
We've talked here before about filtering IP traffic by source for mail servers.
Google Desktop Slams Door On IE Flaw
While users of Internet Explorer still have to be concerned about CSS exploits affecting a newly-discovered problem with the browser, Google Desktop is no longer open to attacks via that flaw.
|
|
|
|
02.23.06
Static Routing Tutorial
 By
Chris Bryant
In studying for your CCNA exam and preparing to earn this valuable certification, you may be tempted to spend little time studying static routing and head right for the more exciting dynamic routing protocols like RIP, EIGRP, and OSPF.
This is an understandable mistake, but still a mistake. Static routing is not complicated, but it's an important topic on the CCNA exam and a valuable skill for real-world networking.
To create static routes on a Cisco router, you use the ip route command followed by the destination network, network mask, and either the next-hop IP address or the local exit interface. It's vital to keep that last part in mind - you're either configuring the IP address of the downstream router, or the interface on the local router that will serve as the exit interface.
Let's say your local router has a serial0 interface with an IP address of 200.1.1.1/30, and the downstream router that will be the next hop will receive packets on its serial1 interface with an IP address of 200.1.1.2/30. The static route will be for packets destined for the 172.10.1.0 network. Either of the following ip route statements would be correct.
R1(config)#ip route 172.10.1.0 255.255.255.0 200.1.1.2 (next-hop IP address)
OR
R1(config)#ip route 172.10.1.0 255.255.255.0 serial0 ( local exit interface)
You can also write a static route that matches only one destination. This is a host route, and has 255.255.255.255 for a mask. If the above static routes should only be used to send packets to 172.10.1.1., the following commands would do the job.
R1(config)#ip route 172.10.1.1 255.255.255.255 200.1.1.2 (next-hop IP address)
OR
R1(config)#ip route 172.10.1.1 255.255.255.255 serial0 ( local exit interface)
Finally, a default static route serves as a gateway of last resort. If there are no matches for a destination in the routing table, the default route will be used. Default routes use all zeroes for both the destination and mask, and again a next-hop IP address or local exit interface can be used.
R1(config)#ip route 0.0.0.0 0.0.0.0 200.1.1.2 (next-hop IP address)
OR
R1(config)#ip route 0.0.0.0 0.0.0.0 serial0 ( local exit interface)
IP route statements seem simple enough, but the details regarding the next-hop IP address, the local exit interface, default static routes, and the syntax of the command are vital for success on CCNA exam day and in the real world.
About the Author:
Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage (www.thebryantadvantage.com), home of FREE CCNA and CCNP tutorials and daily exam questions, as well as The Ultimate CCNA and CCNP Study Packages.
For a FREE copy of his latest e-books, "How To Pass The CCNA" or "How To Pass The CCNP", and for free daily exam question, visit the website and download your copies!
|
