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当前学科：网络管理员考试
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RIP（路由信息协议）有两个版本RIPv1和RIPv2。与RIPv1相比，RIPv2做了哪些方面的改进？（）
A . 身份验证
B . 支持多播
C . 支持无类路由
D . 最大跃点数增大
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