题目内容
SNMPv1是一个不安全的协议，管理站(Manager)与代理(Agent)之间通过 (56) 进行身份认证，由于认证信息没有加密，所以是不安全的。1998年公布的SNMPv3定义了基于用户的安全模型USM，其中的认证模型块结合 (57) 算法形成认证协议，产生了一个96位的报文摘要。SNMPv3还定义了基于视图的访问控制模型VACM。在这个模型中，用户被分成组，属于同一组的用户可以有不同的安全级别，其中 (58) 是最高安全级别。RFC1757定义的RMON管理信息库是对MIB-2的扩充，其中的统计组记录 (59) 的管理信息，而矩阵组则记录 (60) 的通信情况。
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