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Variable Length Subnet Masks (VLSMs)

FIGURE 3.6

A VLSM table, example one

Variable Length Subnet Masks Worksheet

Subnet

Mask

Subnets

Hosts

Block

/26

192

2

62

64

/27

224

6

30

32

/28

240

14

14

16

/29

248

30

6

8

/30

252

62

2

4

Network

Hosts

Block

Subnet

Mask

A

12

16

/28

240

B

20

32

/27

224

C

25

32

/27

224

D

4

8

/29

248

E

2

4

/30

252

F

2

4

/30

252

G

2

4

/30

252

H

2

4

/30

252

Class C Network

192.16.10.0

0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96 100 104 108 112 116 120 124 128 132 136 140 144 148 152 156 160 154 158 172 176 180 184 188 192 196 200 204 208 212 216 220 224 228 232 236 240 244 248 252 256

D - 192.16.10.8/29

A - 192.16.10.16/28

B - 192.16.10.32/27

C - 192.16.10.64/27

E - 192.16.10.96/30 F - 192.16.10.100/30 G - 192.16.10.104/30 H - 192.16.10.108/30

137

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