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2.12.22.3
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2.1
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(1)ISPISPISPInternet
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(2)VANVANVAN
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Internet TCP/IP
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FTP, SMTP, HTTP
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2.2
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Internet+
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2.3
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Internet,VANs
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12N...12N...
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12N...
Recommended
file5, 000 3, 000 2, 000 , 500 , 000 3, 000 1 0, 000 8, 000 5, 000 3, 000 1. 2. 1. 2. 1. 2. 1. 2. 1. 2. 1. 2. 1. 2. 1. 2. 1. 2. 1. 2. 1 1 2 (. sshffl. ntpc. gov
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