ELSA LANCOM Business 6000, Manual

Page: 118 / 174

Technical basics
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ELSA LANCOM Business 6000
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118
EN
As an example, think of a company with one large network, in which the
different divisions are incorporated as small subnets. The address of the
network for the marketing division is made up hierarchically from the address
of the company and that of the department.
Whenever a host external to the company network sends a packet to a host
in the Example Inc., this is what happens:
햲
The sender gives the packet the destination address “host Smith –
Marketing – Example Inc.”.
햳
An external router that establishes the connections to other networks has
to know how to reach Example Inc. As soon as it receives a packet with
the address for Example Inc., it passes the packet on to the router
responsible for Example Inc.
햴
The router in Example Inc. receives the packet and extracts from the
address the information that it is directed at Example Inc. Since it is itself
part of Example Inc., it takes a closer look at the address to find the name
of the division. It then passes the packet on to the router in the marketing
division.
햵
The router in the marketing division receives the packet and extracts from
the address the information that it is directed at the marketing division of
Marketing
Development
Superordinate
network:
Example Inc.
External router as a
connection to other
networks
Host Smith
Example Inc.'s
router
External host