Network Id; Host Id; Subnet Addresses - Cabletron Systems EMME User Manual

Range of Network
IDs:
Binary translation:
(of first octet)
Range for the Host
ID:

1.9.1 Network ID

The Internet Assigned Numbers Authority (IANA) assigns the Network
ID and uniquely identifies a network on the Global Internet. On private
internal networks, unofficial IP addresses can be used allowing the
network address to be unique only within that internal network. (This is
not recommended by Cabletron.) The size of the Network ID is
determined by the class of the IP address.

1.9.2 Host ID

Host IDs are assigned by the local administrator. Since all hosts within the
same network share the same Network ID, each host must have a unique
Host ID. This allows for the identification of each host within the network
based on this portion of the IP address. The class of IP address used
determines the size of the Host ID.

1.9.3 Subnet Addresses

Subnet addresses are used to partition an IP network into multiple
subnetworks or subnets. The use of Subnet addresses adds an additional
layer of hierarchy to the IP addressing scheme. This additional addressing
layer facilitates isolation, control, and administration of users within the
network. This is done by grouping hosts into separate subnets. Use of
subnet addresses on the network means using a subnet mask in
conjunction with each IP address.
EMME USER'S GUIDE
Table 1-4. Class C
192 - 223.1 - 254.1 - 254.host
[3 octets for the Network ID]
1100000 - 11011111
[first and second bits always 1 and third is
always 0]
net.net.net.1 - 254
[1 octet for the Host ID - allows 254 hosts per
network]
IP ADDRESSING
Page 1-17