QMS magicolor 2 DeskLaser User Manual

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Once the Internet address, subnet addresses, and subnet masks are in place, infor-
mation can be sent, or routed, to any destination in the Internet. Both hosts and gate-
ways participate in the routing process.

If information is sent between two devices on a single physical network, or subnet, no 
gateways are involved. The sending device encapsulates the datagram in a physical 
frame, binds the destination internet address to a physical hardware address, and 
sends the resulting frame directly to the destination.

If the information is sent between two devices on two different physical networks, how-
ever, the internet gateways form a cooperative, interconnected structure. Datagrams 
pass from gateway to gateway until they reach a gateway that can deliver them directly 
to a device on that physical network.

464  

TCP/IP defines a means for the network administrator to configure the network that 
best suits the network environment at a site. One method is to define the 32-bit TCP/
IP network address in terms of the number of networks and the number of hosts at the 
site. The network address is partitioned into a network part and a host part.

There are 3 common partitions—Class A, Class B, and Class C. The classification is 
done by the highest order bits. For example, a 0 in the highest order bit of the 32-bit 
address indicates that the address is Class A. Thus, the next 7 bits constitute the net-
work address, and the last 24 bits form the host address. The high order bits also con-
stitute the network mask for the Class A address.

The following table identifies the differences between Class A, B, and C addresses.

A

Sites with few 
networks and many 
hosts

0

7 bits

24 bits

0xFF000000