Route summary is not only important for & 39; consideration of NACC. It s & 39; d & 39; is a valuable ability to have & 39; in the real world as well. In short course can lead to smaller routing tables that are still able to route packages - what I love & 39; as & quot; accurate and complete & quot; tables routing.
The first to & 39; have to work with abstract route binary math, specifically, you should be able to several lines and both come with a summary of road and mask the promotion of downstream routers. Faced with networks 100.16.0.0 / 16, 100.17.0.0 / 16, 100.18.0.0 / 16, and 100.19.0.0 / 16, could you quickly to the conclusion of & 39; address and mask? All you have to do is break the four numbers in the network of channels binaries. We know that the last two years, all bytes to convert the binary string 00000000, as well as in this article we will show that, as to convert the first and second octet decimal to binary.
100 16 = 01100100 00010000
100 17 = 01100100 00010001
100 18 = 01100100 00010010
100 19 = 01100100 00010011
To with the conclusion of range, only work from left to right and draw a line, where the four networks, nor that & 39; a little. For these four networks, from this point, between 14 and 15 bits. It allows us with this channel: 01100100 000100xx. All you have to do c & 39; is that the chain of a new convert to decimal, which gives us 100 for the first octet and 16 for the second. (The two values are x-bit on the right side of the line are not used for calculating the conclusion of road.) Since we know that zero is the value for the last two bytes, the resulting number Abstract Network is 100.16.0.0.
But we do not! We have now, with the summary mask to communicate with the conclusion of road. To access the & 39; route summary, you write in a mask with a binary & quot; 1 & quot; for everything on the left side of the line we had previously, and a & amp; quot; 0 & quot; for everything on the right. This gives us the following string:
11111111 11111100 00000000 00000000
Converting dotted decimal that we arrive at the conclusion of mask 255.252.0.0. The good synthesis and netmask to communicate are 100.16.0.0 252.0.0.0.
For l & 39; consideration CCNA l & 39; emphasis is on knowledge, such as the promotion of these lines in short RIPv2 and EIGRP. For these two protocols, route densification position to & 39; interface is the level - it & 39; is not configured under the protocol. On the & 39; interface should provide the summary line, use the command & quot; IP address Abstract & quot;. Here are some examples, as summarized above would be configured Ethernet0 trail in both RIPv2 and EIGRP.
R1 (config-if) ip summary
R1 Rip-address 100.16.0.0 255.252.0.0 (config-if) & 39; Summary of the IP address eigrp 100 100.16.0.0 255.252.0.0
The main difference between the two is that the command must EIGRP number of & 39; AS - c & 39; is what & quot; 100 & quot; is at the heart of the order EIGRP. Since RIPv2 n & 39; uses no figures, it & 39; is no value added in the configuration.
For OSPF, orders. If the configuration inter-densification of & 39; environment Route position, use the field & quot; rich & quot; order if you compilation distances, which is currently divided into OSPF, you can use the abstract address under the command of OSPF routing process on & 39; ASBR. No d & 39; them are at the interface & 39; orders.
I speaks of & 39; experience, if I tell you that & 39; exercise is the master of the & 39; consideration CCNA, especially with binaries and settling the position of questions. The bulk of these questions is that it & 39; n & 39; are no areas d & 39; shadow of these issues - you know, how it works or not. And with a little & 39; exercise and an eye for detail, you can master these skills, & 39; examination and become a CCNA. It is a success!
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