| Ports and
Sockets |
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| n | Communications
through the Internet occurs between a "Client" |
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| application
software and the same application software running on a |
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| "server" |
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| n | Each
connection is uniquely identified by 4 addresses: (1) Client IP |
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| address,
(2) client application port #, (3) server IP address and (4) |
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| server
application port. |
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| n | Application
ports on the server side are called: "Well-known Sockets". |
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| The
port number for each application is known to all hosts |
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