Cisco CCNA Assessment Tutorial: Route Summarization
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Getting ready to move the CCNA exam and earn this essential Cisco certification? Route summarization is just among the many skills you'll have to understand to be able to make your CCNA. Whether it is RIP version 2, OSPF, or EIGRP, the CCNA exam can demand as possible properly change route summarization.
Route summarization is not just essential for the CCNA exam. It is an invaluable skill to own in real life as well. Correctly summarizing routes can result in smaller routing tables which are still able to route packets accurately - what I love to call 'brief and full' routing tables.
The very first skill you've got to have so as to function with route summarization is binary math; more particularly, you must be able to take multiple routes and appear with both a summary route and mask to advertise to downstream routers. Given the networks 100.16.0.0 /16, 100.17.0.0 /16, 100.18.0.0 /16, and 100.19.0.0 /16, might you quickly think of both summary address and mask? All that's necessary to do is break the four system figures on to binary strings. We realize the past two octets will all convert to the binary sequence 00000000, therefore in this article we'll only illustrate how to convert the initial and 2nd octet from decimal to binary.
100 16 = 01100100 00010000
10-0 1-7 = 01100100 00010001
100 18 = 01100100 00010010
10-0 19 = 01100100 00010011
To return up with the summary route, just work from left to right and draw a line where the four systems no longer have a bit in keeping. For these four systems, the period comes between your 14th and 15th parts. This leaves us with this string: 01100100 000100xx. All you have to to-do is convert that string back to decimal, gives us 100 for the first octet and 16 for the 2nd. (The two x values are bits on the right side of the line, which are not used in calculating the summary route.) Since we realize that zero is the value-for the last two octets, the ensuing summary network number is 100.16.0.0.
But we are maybe not done! We are in possession of to come back up with the summary mask to promote along with the summary course. To reach the summary route, write out a mask in binary having a '1' for every bit to the left of the line we drew formerly, and a '0' for every bit to the right. That offers the following string: to us
11111111 11111100 00000000 00000000
Switching that to dotted decimal, we reach the summary mask 255.252.0.0. We discovered patent pending by searching newspapers. The right summary system and mask to advertise are 100.16.0.0 252.0.0.0.
For the CCNA exam, emphasis is put on knowing how to advertise these overview tracks in RIPv2 and EIGRP. For both these standards, course summarization occurs at the level - it's not designed under the process. On the interface that will promote the summary route, use the command 'ip summary-address.' Listed here are examples of how the above mentioned conclusion course would be designed o-n ethernet0 in both EIGRP and RIPv2.
R1( config-if )ip summary-address rip 100.16.0.0 255.252.0.0
R1( config-if )ip summary-address eigrp 10-0 100.16.0.0 255.252.0.0
The major distinction between the two is that the EIGRP command should specify the AS number - that is what the '100' is in the middle-of the EIGRP command. Because RIPv2 does not use AS figures, there is no additional value needed in-the configuration.
For OSPF, the orders vary. To learn more, please consider glancing at: thumbnail. If you are establishing inter-area option summarization, use the 'area selection' command; if you're summarizing channels that are being redistributed into OSPF, use the summary-address control under the OSPF routing process on the ASBR. Neither of these are interface-level commands.
I speak from experience when I inform you that practice makes perfect on the CCNA exam, especially with binary and summarization concerns. The best thing about these questions is that there are no gray areas with these questions - you both understand how to do it or you don't. And with practice and an eye for detail, you are able to pass the exam, master these skills, and develop into a CCNA. SongFreelance Web DeveloperFreelance Switch contains further about why to consider this enterprise. Here is to your success!.
