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R1、R2是一个自治系统中采用RIP路由协议的两个相邻路由器，R1的路由表如下图( A)所示，当R1收到R2发送的如下图( B)的[V，D]报文后，R1更新的4个路由表项中距离值从上到下依次为0、3、3、4。 那么，①②③④可能的取值依次为______。 A) 0、4、4、3 B) 1、3、3、3 C) 2、2、3、2 D) 3、2、2、3A.
B.
C.
D.
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