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Cards In This Set
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Powers of 2
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2^1 =22^2 = 42^3 = 82^4 = 162^5 = 322^6 = 642^7 = 1282^8 = 2562^9 = 5122^10 = 1,0242^11 = 2,0482^12 = 4,0962^13 = 8,1922^14 = 16,384
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/25
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128 mask 1 bits on and 7 bits off (10000000) Block size of 128 2 subnets, each with 126 hosts
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/26
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What do we know about a /26? 192 mask 2 bits on and 6 bits off (11000000) Block size of 64 4 subnets, each with 62 hosts
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/27
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What do we know about a /27? 224 mask 3 bits on and 5 bits off (11100000) Block size of 32 8 subnets, each with 30 hosts
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/28
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240 mask 4 bits on and 4 bits off Block size of 16 16 subnets, each with 14 hosts
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/29
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248 mask 5 bits on and 3 bits off Block size of 8 32 subnets, each with 6 hosts
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/30
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252 mask 6 bits on and 2 bits off Block size of 4 64 subnets, each with 2 hosts
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How do you find the subnet increment?
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256 - host bits
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How do you find the number of hosts?
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2^y - 2, where y is the number of host bits set to 0.
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How do you find the number of subnets?
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2^x, where x is the number of host bits set to 1.
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How do you find the first and last host in a subnet range?
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The first host is the first number after the beginning of a submet. The last host is the number before the broadcast of that subnet, which is itself one less than the beginning of the next one.
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192.168.100.25/30
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192.168.100.25/30. A /30 is 255.255.255.252. The valid subnet is 192.168.100.24,broadcast is 192.168.100.27, and valid hosts are 192.168.100.25 and 26.
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192.168.100.37/28
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192.168.100.37/28. A /28 is 255.255.255.240. The fourth octet is a block size of 16. Justcount by 16s until you pass 37. 0, 16, 32, 48. The host is in the 32 subnet, with a broadcastaddress of 47. Valid hosts 33–46.
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192.168.100.66/27
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192.168.100.66/27. A /27 is 255.255.255.224. The fourth octet is a block size of 32.Count by 32s until you pass the host address of 66. 0, 32, 64, 96. The host is in the 64 subnet,broadcast address of 95. Valid host range of 65–94.
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192.168.100.17/29
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192.168.100.17/29. A /29 is 255.255.255.248. The fourth octet is a block size of 8. 0, 8,16, 24. The host is in the 16 subnet, broadcast of 23. Valid hosts 17–22.
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