Enterasys Vertical Horizon VH-2402S2 Spécifications télécharger pdf (Page 147)

9033691-01 VH-2402-L3 Management Guide 139

always be pinged from a local node because it forms a

loopback and points back to the same node.

Class D addresses are reserved for multicasting.

Class E Addresses are reserved for future use. They are not

used for node addresses.

The part of the IP address that belongs to the network is the

part that is ‘hidden’ by the ‘1’s in the subnet mask. This can

be seen below:

• Class A NETWORK.node.node.node

• Class B NETWORK.NETWORK.node.node

• Class C NETWORK.NETWORK.NETWORK.node

For example, the IP address 10.42.73.210 is a Class A

address, so the Network part of the address (called the

Network Address) is the first octet (10.x.x.x). The node part

of the address is the last three octets (x.42.73.210).

To specify the network address for a given IP address, the

node part is set to all “0”s. In our example, 10.0.0.0

specifies the network address for 10.42.73.210. When the

node part is set to all “1”s, the address specifies a broadcast

address. So, 10.255.255.255 is the broadcast address for

the network 10.0.0.0.

Subnet Masking

A subnet mask can be applied to an IP address to identify

the network and the node parts of the address. A bitwise

logical AND operation between the IP address and the

subnet mask results in the Network Address.

For example:

00001010.00101010.01001001.11010010 10.42.73.210

Class A IP address

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Enterasys Vertical Horizon VH-2402S2 Spécifications Page 147