![Page 1: Variable Length Subnet Mask(VLSM) 可變長度子網路切割 王振生. Variable Length Subnetting ‣ VLSM allows us to use one class C address to design a networking scheme](https://reader035.vdocuments.pub/reader035/viewer/2022081504/56649d785503460f94a5aeba/html5/thumbnails/1.jpg)
Variable Length Subnet Mask(VLSM)可變長度子網路切割
王振生
![Page 2: Variable Length Subnet Mask(VLSM) 可變長度子網路切割 王振生. Variable Length Subnetting ‣ VLSM allows us to use one class C address to design a networking scheme](https://reader035.vdocuments.pub/reader035/viewer/2022081504/56649d785503460f94a5aeba/html5/thumbnails/2.jpg)
Variable Length Subnetting
‣ VLSM allows us to use one class C address to design a networking scheme to meet the following requirements:
‣ Taipei 60 users‣ Kaohsiung 28 users‣ Taichung 12 users‣ Tainan 12 users‣ WAN links between each router
![Page 3: Variable Length Subnet Mask(VLSM) 可變長度子網路切割 王振生. Variable Length Subnetting ‣ VLSM allows us to use one class C address to design a networking scheme](https://reader035.vdocuments.pub/reader035/viewer/2022081504/56649d785503460f94a5aeba/html5/thumbnails/3.jpg)
Networking Requirements
Taipei 60 users
Taichung 12 users Tainan 12 users Kaohsiung 28 users
WAN 1WAN 2
WAN 3
•If a /26 was used to provide 60 addresses for LANs. There are no addresses left for WAN links•Classful subnetting is very wasteful.
![Page 4: Variable Length Subnet Mask(VLSM) 可變長度子網路切割 王振生. Variable Length Subnetting ‣ VLSM allows us to use one class C address to design a networking scheme](https://reader035.vdocuments.pub/reader035/viewer/2022081504/56649d785503460f94a5aeba/html5/thumbnails/4.jpg)
VLSM Design Scheme
Name/requiredaddresses
Subnet address
Address range
Broadcast
Address/subnet
Taipei/60 192.168.12.0
Kaohsiung/28
Taichung/12
Tainan/12
WAN1/2
WAN2/2
WAN3/2
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VLSM Design Scheme
Name/requiredaddresses
Subnet address
Address range
Broadcast
Address/subnet
Taipei/60 192.168.12.0
.1 - 62 .63 192.168.12.0/26
Kaohsiung/28
Taichung/12
Tainan/12
WAN1/2
WAN2/2
WAN3/2
![Page 6: Variable Length Subnet Mask(VLSM) 可變長度子網路切割 王振生. Variable Length Subnetting ‣ VLSM allows us to use one class C address to design a networking scheme](https://reader035.vdocuments.pub/reader035/viewer/2022081504/56649d785503460f94a5aeba/html5/thumbnails/6.jpg)
VLSM Design Scheme
Name/requiredaddresses
Subnet address
Address range
Broadcast
Address/subnet
Taipei/60 192.168.12.0 .1 - 62 .63 192.168.12.0/26
Kaohsiung/28
192.168.12.64
.65 - .94 .95 192.168.12.64/27
Taichung/12
Tainan/12
WAN1/2
WAN2/2
WAN3/2
![Page 7: Variable Length Subnet Mask(VLSM) 可變長度子網路切割 王振生. Variable Length Subnetting ‣ VLSM allows us to use one class C address to design a networking scheme](https://reader035.vdocuments.pub/reader035/viewer/2022081504/56649d785503460f94a5aeba/html5/thumbnails/7.jpg)
VLSM Design Scheme
Name/requiredaddresses
Subnet address
Address range
Broadcast
Address/subnet
Taipei/60 192.168.12.0 .1 - 62 .63 192.168.12.0/26
Kaohsiung/28
192.168.12.64
.65 - .94 .95 192.168.12.64/27
Taichung/12 192.168.12.96
.97- .110 .111 192.168.12.96/28
Tainan/12
WAN1/2
WAN2/2
WAN3/2
![Page 8: Variable Length Subnet Mask(VLSM) 可變長度子網路切割 王振生. Variable Length Subnetting ‣ VLSM allows us to use one class C address to design a networking scheme](https://reader035.vdocuments.pub/reader035/viewer/2022081504/56649d785503460f94a5aeba/html5/thumbnails/8.jpg)
VLSM Design Scheme
Name/requiredaddresses
Subnet address
Address range
Broadcast
Address/subnet
Taipei/60 192.168.12.0 .1 - 62 .63 192.168.12.0/26
Kaohsiung/28 192.168.12.64 .65 - .94 .95 192.168.12.64/27
Taichung/12 192.168.12.96 .97- .110 .111 192.168.12.96/28
Tainan/12 192.168.12.112
.113 - .126 .127 192.168.12.112/28
WAN1/2
WAN2/2
WAN3/2
![Page 9: Variable Length Subnet Mask(VLSM) 可變長度子網路切割 王振生. Variable Length Subnetting ‣ VLSM allows us to use one class C address to design a networking scheme](https://reader035.vdocuments.pub/reader035/viewer/2022081504/56649d785503460f94a5aeba/html5/thumbnails/9.jpg)
VLSM Design Scheme
Name/requiredaddresses
Subnet address
Address range
Broadcast
Address/subnet
Taipei/60 192.168.12.0 .1 - 62 .63 192.168.12.0/26
Kaohsiung/28 192.168.12.64 .65 - .94 .95 192.168.12.64/27
Taichung/12 192.168.12.96 .97- .110 .111 192.168.12.96/28
Tainan/12 192.168.12.112
.113 - .126 .127 192.168.12.112/28
WAN1/2 192.168.12.128
.129 - .130 .131 192.168.12.128/30
WAN2/2
WAN3/2
![Page 10: Variable Length Subnet Mask(VLSM) 可變長度子網路切割 王振生. Variable Length Subnetting ‣ VLSM allows us to use one class C address to design a networking scheme](https://reader035.vdocuments.pub/reader035/viewer/2022081504/56649d785503460f94a5aeba/html5/thumbnails/10.jpg)
VLSM Design Scheme
Name/requiredaddresses
Subnet address
Address range
Broadcast
Address/subnet
Taipei/60 192.168.12.0 .1 - 62 .63 192.168.12.0/26
Kaohsiung/28 192.168.12.64 .65 - .94 .95 192.168.12.64/27
Taichung/12 192.168.12.96 .97- .110 .111 192.168.12.96/28
Tainan/12 192.168.12.112
.113 - .126 .127 192.168.12.112/28
WAN1/2 192.168.12.128
.129 - .130 .131 192.168.12.128/30
WAN2/2 192.168.12.132
.133 - 134 .135 192.168.12.132/30
WAN3/2
![Page 11: Variable Length Subnet Mask(VLSM) 可變長度子網路切割 王振生. Variable Length Subnetting ‣ VLSM allows us to use one class C address to design a networking scheme](https://reader035.vdocuments.pub/reader035/viewer/2022081504/56649d785503460f94a5aeba/html5/thumbnails/11.jpg)
VLSM Design Scheme
Name/requiredaddresses
Subnet address
Address range
Broadcast
Address/subnet
Taipei/60 192.168.12.0 .1 - .62 .63 192.168.12.0/26
Kaohsiung/28 192.168.12.64 .65 - .94 .95 192.168.12.64/27
Taichung/12 192.168.12.96 .97- .110 .111 192.168.12.96/28
Tainan/12 192.168.12.112
.113 - .126 .127 192.168.12.112/28
WAN1/2 192.168.12.128
.129 - .130 .131 192.168.12.128/30
WAN2/2 192.168.12.132
.133 - 134 .135 192.168.12.132/30
WAN3/2 192.168.12.136
.137 - .138 .139 192.168.12.136/30
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Networking Scheme
Taipei/3620192.168.12.0/26
Taichung/1721192.168.12.96/28
Tainan/1721192.168.12.112/28
Kaohsiung/1721192.168.12.64/27
WAN 1 192.168.12.128/30
S1/0 .129
S1/.130
S1/2 .133
S1/1 .137WAN 2
192.168.12.132/30
WAN 3 192.168.12.136/30
S1/.138
F0/.65F0/.113F0/.97
E0/0 .1
S1/.134