D-Link DES-3326SR User Manual page 74

DES-3326SR Layer 3 Fast Ethernet Switch User's Guide
•
Class A – 11111111.00000000.00000000.00000000
255.0.0.0
•
Class B – 11111111.11111111.00000000.00000000
255.255.0.0
•
Class C – 1111111.11111111.11111111.00000000
255.255.255.0
Additional bits can be added to the default subnet mask for a
given Class to further subnet a network.
logical AND operation is performed between the subnet mask
and the IP address, the result defines the Subnet Address.
Some restrictions apply to subnet addresses. Addresses of all
"0"s and all "1"s are reserved for the local network (when a host
does not know it's network address) and for all hosts on the
network (the broadcast address). This also applies to subnets.
A subnet address cannot be all "0"s or all "1"s. A 1-bit subnet
mask is also not allowed.
Calculating the Number of Subnets and Nodes
To calculate the number of subnets and nodes, use the formula
(2 – 2) where n = the number of bits in either the subnet mask
n
or the node portion of the IP address. Multiplying the number
of subnets by the number of nodes available per subnet gives
the total number of nodes for the entire network.
Example
00001010.00101010.01001001.11010010
Class A IP address
11111111.11100000.00000000.00000000
Subnet Mask
00001010.00100000.00000000.00000000
Network Address
00001010.00101010.11111111.11111111
Broadcast Address
When a bitwise
10.42.73.210
255.224.0.0
10.32.0.0
10.32.255.255
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