CCNA certification requires that you know the basics of OSPF, and for many preparing for the CCNA test, their first exhibition in OSPF is a hub and spoke configuration. It is a tough way to start because a hub and spoke configuration based on a technology such as Frame Relay needs a little attention to the details. Let us take a brief look at some errors in OSPF configuration and how to ignore them on CCNA exam.



Make sure that the hub is the router and there is no backup designated router. This is done by placing special emphasis on zero OSPF interface to very important spoke routers. It is not just a question of ensuring that the hub has won the election with its default interface of OSPF but that prevents the spokes getting opportunity to be the DR.

Configure neighbor statements on the central hub because we have a NBMA network, the hub can not dynamically find its neighbors. Neighbor statements are not required on the spokes. (Not bad, but they do nothing)

If you're neighboring OSPF not work as expected, make sure your knowledge of the OSI model to resolve the problem. If you are not using the "liberation" in their choice of frame relay statements, various OSPF will not be possible success with the neighbors. If you prepare for the exam and win this coveted Cisco CCNA, you must be fully prepared for many types of binary and Cisco sub netting questions which may be sent to you. They also have the opportunity to deal with the various arrangements under which a sub net mask expressed and that are your knowledge. The rating notation is another way to find the value of a sub net mask, unlike the most famous dotted decimal format. You will see it in your Cisco CCNA examination. Pay attention on following two values:

(1) 255.255.255.0

(2) / 24

These values are exactly the same. The first mask is in the dotted decimal format, and you know by the first three bit to "1" as the maximum value is 255.

The second value is exactly the same mask; this value is considered only in the rating notation. This value is "slash twenty-four", and 24 is the number of those in the sub net mask.

Those of us who hate typing numbers are particularly grateful for this because it means that you type, much less a sub net mask. Moreover, it is much easier to discuss hidden in decimal prefix. ( "I thought, with a two-two-five to fifty to fifty to fifty-five-zero five two mask, but then decided, two five-fifty to fifty two and five fifties and two to five-eight mask. .. ")

Make sure you at ease, with the rating prefix before they CCNA examination. As with Cisco documentation, you have the chance to see masks, and in dotted decimal rating prefix, and you must be willing, employment and.

Paying special attention to these details, and that is much closer CNAC day on which the test successfully and to gain their certification. I commend you, some experience with configuring OSPF star before the CCNA test, because it is really for tasks like that is very confident regarding the CCNA test day.