边界网关协议BGP4是一种动态路由发现协议，它的主要功能是（ ）。BGP路由器之间传送的是AS路径信息，这样就解决了（ ）问题。BGP4报文封装在（ ）。
问题1选项
A.发现新的路由
B.计算最短通路
C.控制路由策略
D.维护网络拓扑数据库
问题2选项
A.路由环路
B.最短通路
C.路由计算
D.路由更新
问题3选项
A.IP数据报
B.以太帧
C.TCP报文
D.UDP报文
正确答案及解析
正确答案
解析
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