以下关于RIPv2对于RIPv1改进的说法中，错误的是（ ）。
- A.RIPv2是基于链路状态的路由协议
- B.RIPv2可以支持VLSM
- C.RIPv2可以支持认证，有明文和MD5两种方式
- D.RIPv2采用的是组播更新
正确答案及解析
正确答案
解析
RIP第二版相对于第一版的改进主要是支持VLSM，同时采用了组播更新的机制。但是它本身仍然是一种距离向量型协议。
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