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Appendix A IP Addresses and Subnetting
GS-1524/GS-1548 User’s Guide
158
The following figure shows the company network after subnetting. There are now
two sub-networks, A and B.
Figure 91
Subnetting Example: After Subnetting
In a 25-bit subnet the host ID has 7 bits, so each sub-network has a maximum of
2
7
– 2 or 126 possible hosts (a host ID of all zeroes is the subnet’s address itself,
all ones is the subnet’s broadcast address).
192.168.1.0 with mask 255.255.255.128 is subnet A itself, and 192.168.1.127
with mask 255.255.255.128 is its broadcast address. Therefore, the lowest IP
address that can be assigned to an actual host for subnet A is 192.168.1.1 and
the highest is 192.168.1.126.
Similarly, the host ID range for subnet B is 192.168.1.129 to 192.168.1.254.
Example: Four Subnets
The previous example illustrated using a 25-bit subnet mask to divide a 24-bit
address into two subnets. Similarly, to divide a 24-bit address into four subnets,
you need to “borrow” two host ID bits to give four possible combinations (00, 01,
10 and 11). The subnet mask is 26 bits
(11111111.11111111.11111111.11000000) or 255.255.255.192.
Содержание GS-1524
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Страница 8: ...Safety Warnings GS 1524 GS 1548 User s Guide 8 ...
Страница 10: ...Contents Overview GS 1524 GS 1548 User s Guide 10 ...
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Страница 26: ...Chapter 2 Hardware Installation and Connection GS 1524 GS 1548 User s Guide 26 ...
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Страница 42: ...Chapter 4 The Web Configurator GS 1524 GS 1548 User s Guide 42 ...
Страница 52: ...Chapter 6 Port Settings GS 1524 GS 1548 User s Guide 52 ...
Страница 62: ...Chapter 8 VLAN GS 1524 GS 1548 User s Guide 62 ...
Страница 82: ...Chapter 12 Port Rate Limit and Storm Control GS 1524 GS 1548 User s Guide 82 ...
Страница 86: ...Chapter 13 Layer 2 L2 Management GS 1524 GS 1548 User s Guide 86 ...
Страница 92: ...Chapter 15 Auto Denial of Service DoS GS 1524 GS 1548 User s Guide 92 ...
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Страница 136: ...Chapter 19 RMON Lite GS 1524 GS 1548 User s Guide 136 ...
Страница 144: ...Chapter 21 Troubleshooting GS 1524 GS 1548 User s Guide 144 ...
Страница 150: ...Chapter 22 Product Specifications GS 1524 GS 1548 User s Guide 150 ...
Страница 151: ...151 PART IV Appendices and Index IP Addresses and Subnetting 151 Legal Information 163 Index 167 ...
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Страница 166: ...Appendix B Legal Information GS 1524 GS 1548 User s Guide 166 ...