在图4所示的网络拓扑中，假设自治系统AS3和AS2内部运行OSPF,AS1和AS4内部运行RIP。各自治系统间用BGP作为路由协议，并假设AS2和AS4之间没有物理链路。则路由器3c基于（）协议学习到网络x的可达性信息。1d通过（作答此空）学习到x的可达性信息。
- A.3A
- B.1A
- C.1B
- D.1C
正确答案及解析
正确答案
解析
1d可以通过1c，也可以通过1a学习到X的可达性信息。首先，IBGP中为了防止AS内部产生环路，BGP设备不会从IBGP对等体学到的路由通告给其他IBGP对等体，所以在1c和1d建立BGP对等的情况下，会从1c学习到X的可达性信息。其次在1c和1d没有建立BGP对等体的情况下，1c和1a建立对等体，1a和1d建立对等体，通过1a作为路由反射器并配置路由反射器功能，那么1d可以通过1a学习到X的可达性信息。此题题干缺少条件，但是基于一般性考虑，我们默认AS内部的路由器都两两建立的BGP对等，此时1d是从1c学习到X的可达性信息。
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