42 lines
1.5 KiB
Plaintext
42 lines
1.5 KiB
Plaintext
Network Concepts
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^^^^^^^^^^^^^^^^
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NODE A bulletin board system that calls another
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bulletin board system (a hub) in order to
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transfer mail. A node doesn't receive its mail
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directly from any other BBS (that is, no one
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calls it to transfer mail.)
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HUB A bulletin board system which may or may not
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call another hub system in order to transfer
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mail, but is called by one or more nodes to
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transfer mail.
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REGIONAL HUB A hub which calls another hub in order to
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transfer mail. It's called a regional hub
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because when designing a network, a hub is
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usually placed in each of the major regions
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serviced in order to minimize long distance
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phone charges.
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For example :
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P&BNetHub
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/ \ \
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/ \ \
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/ \ \
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RUBYS BBS1 BBS2
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/ \
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/ \
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BBS3 BBS4
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P&BNetHub is the NATIONAL HUB because it does not call anyone for mail.
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BBS1 and BBS2 are NODES, directly linked to P&BNetHub. BBS3 and BBS4 are
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nodes connected to RUBYS. RUBYS is a node of P&BNetHub and also a
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REGIONAL HUB since it calls P&BNetHub to transfer mail.
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Each hub that is a regional hub has a HUB ID. This ID is used by the
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regional hub to identify itself when it calls the hub "above" it to
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transfer mail. The network shown above would consist of four nodes, one
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regional hub and one national hub (P&BNetHub).
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