ELSA LANCOM Business 6000, Руководство пользователя, Страница: 112 / 174

Technical basics
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ELSA LANCOM Business 6000
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112
EN
Router The transport of packets between two hosts occurs indirectly through
exchanges that pass packets on to the target computer. These exchanges are
called routers. A router has at least two interfaces so that it can receive the
data from a sender and pass them on to a recipient. Apart from the exchange
function, the router also has the properties of a host so that it can also be the
recipient of data packets, for configuration purposes for example.
7.1.2 Connection modes
Point-to-point
connection
When exactly two hosts are connected via a medium, this is referred to as a
point-to-point connection. One host transmits packets that can only be
received by exactly
one recipient (unambiguous connection).
Access to the Internet is also established through point-to-point connections.
Even though the data packets are sent from the host at the Internet user to
the host at the Internet provider (server) via several routers, every data packet
still has its own specific destination. Furthermore, the routers will only
forward the data packets to one recipient. That's why we also call this
connection unambiguous.
Strictly speaking, the term “point-to-point connection” is not quite correct.
For our purposes though, it is sufficient to distinguish this kind of connection
from the following “point-to-multipoint connections”.
Host
Host
Medium
Data packet
Host Host
Internet user Web server
Connections to other routers
Router