Open Systems, Closed Systems, & Killer Apps

[Duncan Frissell]

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Various correspondents have pointed out that X.25 is an "open system" in
that it is not proprietary.  I knew that.  I was thinking more of
hierarchical vs peer-to-peer.  I have been under the impression that
TCP/IP connections are more peer-to-peer between different sorts of
networks (or nodes) than X.25.  Isn't X.25 more of a standard for a
single network?  Don't X.25 networks need someone more "in charge" than
TCP/IP networks, or am I mixing up different layers on the OSI reference
model?  Which gives me an opportunity to post the only mnemonic that I
ever created:

Read from the bottom up:

(and) Anarchists  Application
Progressives      Presentation (back when it was Communication, it was Commies)
Socialists        Session
Trust             Transport
Never             Network
Departments       Data Link
Police            Physical

DCF


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