HP -UX SNAplus2 Instrukcja Użytkownika Pobierz pdf (Strona 25)

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Chapter 1 25

SNA Terms and Concepts

Systems Network Architecture

Systems Network Architecture (SNA) is an IBM data communication

architecture that speciﬁes common conventions for communicating

among a wide variety of hardware and software data communication

products. This architecture consists of two kinds of deﬁnitions: formats

that deﬁne the layout of messages exchanged by network components,

and protocols that deﬁne the actions that network components take in

response to messages.

An SNA network is a collection of computers that are linked together and

communicate using SNA.

Originally, SNA was designed to enable communications with a host

computer. Each network or sub-network was controlled by the host; other

computers communicated directly with the host, but not with each other.

This older, host-controlled style of network is often referred to as subarea

SNA. SNA has since developed to support direct peer-to-peer

communications between computers in the network, without requiring a

host. This newer, peer-level networking is APPN.

Many SNA networks have elements of both subarea and peer-to-peer

networking. As networks migrate from subarea SNA to APPN, an

APPN-capable host may act to control older systems while also acting as

a peer to newer systems. Similarly, a single computer may access both

peer computers (in an APPN network) and an older host; its

communications with the host are controlled by the host, but its

communications with other computers are peer-to-peer and do not

involve the host.

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