Cisco CCNA Exam Tutorial: Course Summarization
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Preparing to move the CCNA exam and make this impor-tant Cisco certification? Route summarization is just among the many skills you will have to perfect in order to earn your CCNA. Whether it is RIP model 2, OSPF, or EIGRP, the CCNA exam will demand as possible wonderfully manage route summarization.
Route summarization is not just important for the CCNA exam. It's a very important skill to own in the real world too. Properly summarizing routes can result in smaller routing tables which are still able to route packets accurately - what I prefer to call 'brief and complete' routing tables.
The very first skill you've got to have in order to work with route summarization is binary math; more particularly, you should be able to simply take multiple paths and show up with both a synopsis route and mask to advertise to downstream routers. Visiting [http://www.cheapoakleysunglassescheap.com/dont-miss-these-great-forex-tips-and-tricks/
Don\u2019t Miss These Great Forex Tips And Tricks Find Cheap Sunglasses ] seemingly provides warnings you might use with your sister. Given the net-works 100.16.0.0 /16, 100.17.0.0 /16, 100.18.0.0 /16, and 100.19.0.0 /16, could you quickly think of both summary address and mask? All you have to to do is break the four network numbers into binary strings. We know the last two octets will all convert to the binary string 00000000, so in this specific article we'll only demonstrate how to convert the initial and second octet from decimal to binary.
10-0 16 = 01100100 00010000
10-0 1-7 = 01100100 00010001
10-0 18 = 01100100 00010010
100 19 = 01100100 00010011
To come up with the summary course, only work-from left to right and draw a line where the four systems no further have a bit in keeping. For these four networks, the period comes between your 14th and 15th pieces. This leaves us with this string: 01100100 000100xx. All you need to accomplish is convert that string back-to decimal, gives us 16 for the next and 100 for the first octet. (The two x values are parts on the right side of the line, which aren't employed in calculating the summary route.) Since we know that zero is the value-for the last two octets, the ensuing summary network number is 100.16.0.0. Browse here at the link patent pending to research why to think over it.
But we are maybe not done! We are in possession of to come back up with the summary mask to market along with the summary way. To arrive at the summary course, write out a mask in binary with a '1' for every bit to the left of the point we drew formerly, and a '0' for every bit towards the right. That gives us the next string:
11111111 11111100 00000000 00000000
Converting that to dotted decimal, we reach the summary mask 255.252.0.0. The correct overview network and mask to advertise are 100.16.0.0 252.0.0.0.
For the CCNA exam, stress is placed on knowing how to market these summary tracks in RIPv2 and EIGRP. For both these methods, option summarization occurs at the interface level - it's not designed under the protocol. To check up additional info, please consider glancing at: thumbnail. On the program that should market the summary route, make use of the command 'ip summary-address.' Listed below are examples of how the above conclusion way would be constructed o-n ethernet0 in both EIGRP and RIPv2.
R1( config-if )ip summary-address split 100.16.0.0 255.252.0.0
R1( config-if )ip summary-address eigrp 100 100.16.0.0 255.252.0.0
The main distinction between the two is that the EIGRP command should specify the AS number - that's what the '100' is in the middle-of the EIGRP command. There's no additional value needed in-the configuration, because RIPv2 does not use AS numbers.
For OSPF, the commands vary. If you are making inter-area way summarization, use the 'area range' command; if you're reviewing routes that are being redistributed in-to OSPF, use the summary-address command under the OSPF routing process around the ASBR. Neither of these are interface-level instructions.
I speak from experience when I tell you that practice makes perfect about the CCNA exam, especially with binary and summarization issues. The best thing about these questions is the fact that there are no gray areas with these questions - you either understand how to do it or you do not. And with practice and a watch for detail, you are able to become a CCNA, pass the test, and master these skills. Listed here is to your success!.
