Appendix B IP Addresses and Subnetting
XGS-4728F User’s Guide
412
Subnetting
You can use subnetting to divide one network into multiple sub-networks. In the following
example a network administrator creates two sub-networks to isolate a group of servers from
the rest of the company network for security reasons.
In this example, the company network address is 192.168.1.0. The first three octets of the
address (192.168.1) are the network number, and the remaining octet is the host ID, allowing a
maximum of 2
8
– 2 or 254 possible hosts.
The following figure shows the company network before subnetting.
Figure 239
Subnetting Example: Before Subnetting
You can “borrow” one of the host ID bits to divide the network 192.168.1.0 into two separate
sub-networks. The subnet mask is now 25 bits (255.255.255.128 or /25).
The “borrowed” host ID bit can have a value of either 0 or 1, allowing two subnets;
192.168.1.0 /25 and 192.168.1.128 /25.
The following figure shows the company network after subnetting. There are now two sub-
networks,
A
and
B
.
255.255.255.192
/26
1100 0000
192
255.255.255.224
/27
1110 0000
224
255.255.255.240
/28
1111 0000
240
255.255.255.248
/29
1111 1000
248
255.255.255.252
/30
1111 1100
252
Table 158
Alternative Subnet Mask Notation (continued)
SUBNET MASK
ALTERNATIVE
NOTATION
LAST OCTET
(BINARY)
LAST OCTET
(DECIMAL)
Содержание XGS-4728F
Страница 2: ......
Страница 8: ...Safety Warnings XGS 4728F User s Guide 8 ...
Страница 24: ...24 ...
Страница 30: ...Chapter 1 Getting to Know Your Switch XGS 4728F User s Guide 30 ...
Страница 34: ...Chapter 2 Hardware Installation and Connection XGS 4728F User s Guide 34 ...
Страница 42: ...Chapter 3 Hardware Overview XGS 4728F User s Guide 42 ...
Страница 44: ...44 ...
Страница 78: ...Chapter 7 System Status and Port Statistics XGS 4728F User s Guide 78 ...
Страница 92: ...Chapter 8 Basic Setting XGS 4728F User s Guide 92 ...
Страница 94: ...94 ...
Страница 114: ...Chapter 9 VLAN XGS 4728F User s Guide 114 ...
Страница 118: ...Chapter 10 Static MAC Forward Setup XGS 4728F User s Guide 118 ...
Страница 148: ...Chapter 14 Bandwidth Control XGS 4728F User s Guide 148 ...
Страница 162: ...Chapter 17 Link Aggregation XGS 4728F User s Guide 162 ...
Страница 186: ...Chapter 21 Policy Rule XGS 4728F User s Guide 186 ...
Страница 230: ...Chapter 25 AAA XGS 4728F User s Guide 230 ...
Страница 268: ...268 ...
Страница 324: ...324 ...
Страница 332: ...Chapter 38 Maintenance XGS 4728F User s Guide 332 ...
Страница 358: ...Chapter 41 Syslog XGS 4728F User s Guide 358 ...
Страница 366: ...Chapter 42 Cluster Management XGS 4728F User s Guide 366 ...
Страница 370: ...Chapter 43 MAC Table XGS 4728F User s Guide 370 ...
Страница 374: ...Chapter 44 IP Table XGS 4728F User s Guide 374 ...
Страница 378: ...Chapter 46 Routing Table XGS 4728F User s Guide 378 ...
Страница 381: ...381 PART VI Troubleshooting Product Specifications Troubleshooting 383 Product Specifications 393 ...
Страница 382: ...382 ...
Страница 392: ...Chapter 48 Troubleshooting XGS 4728F User s Guide 392 ...
Страница 402: ...Chapter 49 Product Specifications XGS 4728F User s Guide 402 ...
Страница 403: ...403 PART VII Appendices and Index IP Addresses and Subnetting 409 Legal Information 405 Index 417 ...
Страница 404: ...404 ...
Страница 408: ...Appendix A Legal Information XGS 4728F User s Guide 408 ...