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Appendix A IP Addresses and Subnetting
GS-1524/GS-1548 User’s Guide
154
The following figure shows an example IP address in which the first three octets
(192.168.1) are the network number, and the fourth octet (16) is the host ID.
Figure 89
Network Number and Host ID
How much of the IP address is the network number and how much is the host ID
varies according to the subnet mask.
Subnet Masks
A subnet mask is used to determine which bits are part of the network number,
and which bits are part of the host ID (using a logical AND operation). The term
“subnet” is short for “sub-network”.
A subnet mask has 32 bits. If a bit in the subnet mask is a “1” then the
corresponding bit in the IP address is part of the network number. If a bit in the
subnet mask is “0” then the corresponding bit in the IP address is part of the host
ID.
The following example shows a subnet mask identifying the network number (in
bold text) and host ID of an IP address (192.168.1.2 in decimal).
Table 73
Subnet Mask Example
1ST
OCTET:
(192)
2ND
OCTET:
(168)
3RD
OCTET:
(1)
4TH
OCTET
(2)
IP Address (Binary)
11000000
10101000
00000001
00000010
Subnet Mask (Binary)
11111111 11111111 11111111 00000000
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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 ...
Страница 18: ...18 ...
Страница 26: ...Chapter 2 Hardware Installation and Connection GS 1524 GS 1548 User s Guide 26 ...
Страница 34: ...34 ...
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 ...
Страница 96: ...96 ...
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 ...