NAC’s（Network Access Control）role is to restrict network access to only compliant endpoints and __（66）__ users．However, NAC is not a complete LAN__（67）__solution; additional proactive and__（68）__security measures must be implemented．Nevis is the first and only comprehensive LAN security solution that combines deep security processing of every packet at 100Gbps, ensuring a high level of security plus application availability and performance．Nevis integrates NAC as the first line of LAN security __（69）__In addition to NAC，enterprises need to implement role-based network access control as well as critical proactive security measures-real-time, multilevel __（70）__inspection and microsecond threat containment．

（67）处填（）。

A．crisis

B．security

C．favorable

D．excellent

下列投资决策指标中运用得很久、很广的是（）。

A.投资回收期法

B.平均报酬率法

C.净现值法

D.内部报酬率法