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    Here is the chart that I always write before a Cisco exam while it's doing its demo. The order of the rows is random and non-essential. 1 2 3 4 5 6 7 8 7 6 5 4 3 2 1 0 IIIIIIII IIIIIIII IIIIIII IIIIIIII IIIIIIII IIIIIIII IIIIIII IIIIIIII I II III IIII IIIII IIIIII IIIIII IIIIIIII 128 192 224 240 248 252 254 255 80 C0 E0 F0 F8 FC FE FF /9 /10 /11 /12 /13 /14 /15 /16 /17 /18 /19 /20 /21 /22 /23 /24 /25 /26 /27 /28 /29 /30 /31 /32 128 64 32 16 8 4 2 1 127 63 31 15 7 3 1 0 126 62 30 14 6 2 0 0 Explained Line by Line: 1 2 3 4 5 6 7 8 [Subnet bits borrowed, counting from the left and including the leftmost bit position in the count] 7 6 5 4 3 2 1 0 [Host bits borrowed, counting from the right and NOT including the rightmost bit position in the count] IIIIIIII IIIIIIII IIIIIII IIIIIIII IIIIIIII IIIIIIII IIIIIII IIIIIIII [Visualization of a full 32-bit subnet mask] I II III IIII IIIII IIIIII IIIIII IIIIIIII [Subnet mask bits being used for the active octet] 128 192 224 240 248 252 254 255 [Decimal sum of the namespace for IP addresses; also the network address of the last subnet] 80 C0 E0 F0 F8 FC FE FF [Hexadecimal sum of the namespace for IP addresses] /9 /10 /11 /12 /13 /14 /15 /16 /17 /18 /19 /20 /21 /22 /23 /24 /25 /26 /27 /28 /29 /30 /31 /32 [CIDR (Classless Inter-Domain Routing)] 128 64 32 16 8 4 2 1 [Number of valid IP addresses given subnet length - known as the block size or the increment] 127 63 31 15 7 3 1 0 [Wildcard IP addresses] 126 60 30 14 6 2 0 0 [Number of valid hosts give the subnet length, making room for broadcast and default gateway]
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    Please check back later for more details. ETA of completion: July 31. Last updated: July 3. There are about 5 more that still need to be manually added to this list which have since been selected. Please note that this website's Twitter channel is @vNetworking. Below is the VMware Top Contributors List that I've found on Twitter. The criteria for being on this list is not just being one of the best but also being a substantial contributor to the advancement of VMware research. @ady189: Adrian Roberts is a VCDX in DCV and CMA, and posts on a wide range of advanced VMware topics. @DuncanYB: Duncan Epping is chief technologist at VMware, runs Yellow-Bricks.com, and is author of Essential Virtual SAN and many other titles. @ericsiebert: The web author of vLaunchPad, which is an excellent list of VMware resources including the top 100 voted-on VMware blogs. @EzzeldinHussein: He is on top of daily news developments in VMware. @MarcHuppert: He is VCDX #181 and shares tutorials often related to VSAN and NSX. @mlydy: Matt Lydy is a well-rounded contributor who covers advanced storage and virtual networking topics. @nathan_owen: Founder of Blue Medora, which develops monitoring tools for VMware vRealize. @PatGelsinger: Pat Gelsinger is the CEO of VMware, and has a strong technical grasp of his business as is self-evident from his keynote presentations. @RoshniMadaiah: She works at VMware and shares helpful info on topics such as vRealize Operations and VSAN. @vCommunityGuy: The vExpert and VMware Community Manager. @VFrontDe: Posts many tutorials, often with an emphasis on VMware updates and patching. @vGhetto: Virtually Ghetto is a channel that provides many VMware DevOps tutorials. @virtRich: Rich Dowling is a VCAP5-DCA/DCD and posts many useful guides on topics including NSX and PowerCLI. @vmwarehorizon: VMware Horizon is an official channel reporting on the most excited VDI use cases worldwide. @vmware_za: VMware South Africa is an official channel which offers useful VMware news from around the world. @wholmes: Wade Holmes is VCDX #15 and specializes in NSX.