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C棟 C棟 A棟 A棟 ISA ISA ISA ISA ISA ISA ISA ISA 老師 老師 DNS DNS DNS DNS PROXY PROXY PROXY WWW WWW WWW MAIL MAIL MAIL D棟 D棟 B棟 B棟 A棟 A棟 宿網PowerStation Netkeeper (IDS) Netkeeper (IDS) CSU/DSU Cisco Router Cisco Router PowerStation PowerStation Hinet Hinet Hinet GSN GSN GSN GSN GSN