【单选题】以下关于ISP概念的描述中错误的是
A.
ISP为用户接入Internet与使用各种网络服务提供服务
B.
ISP分为最顶层的第一层ISP、第二层的区域或国家级的ISP以及第三层的ISP
C.
第一层的国家服务提供商NSP是由ISOC批准的
【单选题】以下关于ISP概念的描述中错误的是
A.
ISP为用户接入Internet与使用各种网络服务提供服务
B.
ISP分为最顶层的第一层ISP、第二层的区域或国家级的ISP以及第三层的
C.
第一级的国家服务提供商NSP是由ISOC批准的
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