Appendix E IP Addresses and Subnetting
DMA-1000 Series User’s Guide
126
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 95
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 40
Alternative Subnet Mask Notation (continued)
SUBNET MASK
ALTERNATIVE
NOTATION
LAST OCTET
(BINARY)
LAST OCTET
(DECIMAL)
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Страница 78: ...Chapter 11 Troubleshooting DMA 1000 Series User s Guide 78 ...
Страница 88: ...Appendix A Product Specifications DMA 1000 Series User s Guide 88 ...
Страница 114: ...Appendix C Setting up Your Computer s IP Address DMA 1000 Series User s Guide 114 ...
Страница 182: ...Appendix G Legal Information DMA 1000 Series User s Guide 182 ...
Страница 192: ...Index DMA 1000 Series User s Guide 192 ...