问题：
[单选题]6. 假设R1通过BGP从R3学到了去往9.1.0.0/16的最佳路由，R1通过一条使用子网8.1.1.4/30的点对点串 行链路与R2建立了邻居连接，并且R1配置了auto-summary命令，那么下面有关R1向R2宣告哪些路由的 描述，哪一项是正确的?
A.R1仅向R2宣告9.0.0.0/8，而不宣告9.1.0.0/16
B.如果配置了BGP子命令aggregate-address 9.0.0.0 255.0.0.0，那么R1仅向R2宣告9.0.0.0/8，而 不宣告9.1.0.0/16
C.如果配置了BGP子命令network 9.0.0.0 mask 255.0.0.0，那么R1仅向R2宣告9.0.0.0/8，而不宣 告9.1.0.0/16
D.以上均不正确
Tags：思科认证CCIE路由和交换分类模拟试题
答案解析：
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