Subnetting
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12 Terms
1
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Subnetting
Dividing a network into smaller subnetworks by borrowing bits from the host portion of an IP address.
2
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Number of Subnets
Calculated as 2^n
3
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Number of Hosts
Calculated as 2^m - 2
4
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Increment
The size of each subnet
5
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Borrow 3 bits in Class C
Number of subnets: 2^3 = 8.
6
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14 hosts needed
Number of host bits required: m = 4 (since 2^4 - 2 = 14).
7
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Increment for /26
Increment: 2^6 = 64.
8
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16 hosts needed
Number of host bits required: m = 5 (since 2^5 - 2 = 30).
9
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Increment for /28
Increment: 2^4 = 16.
10
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Borrow 1 bit in Class C
Number of subnets: 2^1 = 2.
11
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18 hosts needed
Number of host bits required: m = 5 (since 2^5 - 2 = 30).
12
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Borrow 2 bits in Class C
Number of subnets: 2^2 = 4.
Note 
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