![]() I've seen a lot of different ways to visualize subnetting, but this chart is easy to remember and write out quickly. There's plenty more studying in my near future. Plus all the topics that don't rely on subnetting and that I don't deal with too much in my daily work - STP, VTP, frame relay, NAT and routing protocols. Summarizing doesn't come quickly either, mostly figuring out where to start the summarization. Fortunately, "This new subnet needs to cover 9,000+ hosts" doesn't come up a lot. I still get slowed down counting 8s and 16s and factors of 2 beyond common RAM sizes (8096). Eg, I can quickly figure that a /21 wildcard mask has a 7 in the 3rd octet: 0.0.7.255. ![]() ![]() Subtract one from the bit value to quickly get the wildcard mask. The bit value tells me the network increment by octet, and the bit value -2 is the number of valid hosts for /24 and smaller networks. ![]() I can quickly map the CIDR to the subnetmask and vice versa. This is the easy to build subnetting chart I made today. ![]()
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