?一、网络安全威胁中小企业网络面临的安全威胁大体可分为两种：一是对网络数据的威胁；二是对网络设备的威胁。这些威胁可能来源于各种各样的因素大致有下面３种：１．非人为的、自然力造成的数据丢失、设备失效、线路阻断，如突然断电、雷击等导致网络设备的损坏。２．人为 First, the network security threats Small and medium enterprise network security threats can be broadly divided into two types: one is the threat to the network data; the other is the threat to network equipment. These threats may come from a variety of factors generally have the following three kinds: 1. Non-human, natural data loss, equipment failure, line blocking, such as sudden power outages, lightning and other network equipment damage. 2. Man-made