E24254-01
Appendix G TCP/IP Connectivity 189
TCP/IP Connectivity
■
Subnet Masks
Definitions:
•
Subnets
allow network administrators to further divide the host part of an
IP address into further, smaller, networks—subnets.
•
A
mask
is a filter that selectively includes or
excludes
certain values.
Values that do not conform to the mask can not access the device.
•
A
subnet mask
, or
netmask
, is a 32-bit mask that divides an IP address
into subnets and specifies the available hosts on a network.
A subnet mask looks like an IP address and is often seen in 255.255.255.0
notation. It uses a “1” bit to filter, or “mask” allowable addresses in the
network.
For example: 255.255.255.0 is a subnet mask.
Where:
-
255 values
mask
the access of an IP address range and
-
0 (or 000) values
allow
the access of an IP address range
When configuring the IP address, including the “slash” notation (for example /
24) is known as Classless Inter-Domain Routing (CIDR
1
) format and indicates
the subnet mask for that IP address. While the more conventional notation
255.255.255.0 provides the same information, the subnet mask is more
concise using the CIDR notation.
Here is an example of a netmask, binary conversion, and the number of bits
masked.
The above example is a 32-bit address, which is a broadcast address and
does not allow any hosts, computers, or other network devices access.
1.
CIDR is often pronounced as Cedar.
Netmask
First Octet
Second Octet
Third Octet
Fourth Octet
255.
255.
255.
255
Conversion 11111111
11111111
11111111
11111111
Netmask length
(CIDR notation)
/8 /16 /24 /32
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Страница 12: ...Contents xii SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Страница 18: ...Tables xviii SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Страница 76: ...Introduction 56 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Страница 97: ...E24254 01 Chapter 3 Site Survey Forms 77 Site Survey Forms Figure 21 Content Management Plan ...
Страница 98: ...Site Survey Forms 78 SL8500 Systems Assurance Guide July 2011 E24254 01 Figure 21 Content Management Plan ...
Страница 137: ...E24254 01 Chapter 4 Site Preparation 117 Site Preparation ...
Страница 138: ...Site Preparation 118 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Страница 163: ...E24254 01 Appendix A Content Management 141 Content Management Figure 47 Content Management Work Sheets ...
Страница 164: ...Content Management 142 SL8500 Systems Assurance Guide July 2011 E24254 01 Figure 47 Content Management Work Sheets ...
Страница 198: ...Electrical Conversions 176 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Страница 206: ...Comparisons 184 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Страница 233: ...E24254 01 Appendix H Partitioning 211 Partitioning Make copies as necessary ...
Страница 240: ...Partitioning 218 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Страница 251: ...E24254 01 Appendix J Work Sheets 229 Work Sheets Figure 73 Content Management Work Sheet ...
Страница 276: ...Index 254 SL8500 Systems Assurance Guide June 2011 E24254 01 ...
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