ISP = Internet Service Provider(网络服务提供商)
ICP = Internet Content Provider(网络内容提供商)
CPT = Cisco Packet Tracer
eNSP = Enterprise Network Simulation Platform
CLI = Command Line Interface
GUI = Graphical User Interface
数通设备厂商：Cisco(思科)/Huawei(华为)/Juniper(瞻博)
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