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intermediate system (IS)

In an OSI network, an intermediate system (IS) is a switching component that provides certain services for the end devices. The generally applicable, network-independent term for such a network component is node; on the Internet, these are gateways or routers

. In OSI terminology, a distinction is made between an intermediate system and a relay system. The former can be any router or host

with router intelligence, the latter are pure "link elements", i.e. only routers.

Designations for the switching components in the different network configurations

Designations for the switching components in the different network configurations

An intermediate system links subnets of different technologies on OSI layer 3. An example is the coupling ofCSMA/CD LANs with an X.25 WAN. In this way, subnets of different types in both the LAN and the WAN area can be connected to form a uniform global network. Intermediate systems only comprise protocol layers 1 to 3 in contrast to end systems, which have the full OSI layers 1 to 7.

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Englisch: intermediate system - IS
Updated at: 04.08.2005
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