以下关于BGP路由协议的说法中，错误的是（ ）。
- A.BGP协议是一种外部网关协议
- B.BGP协议为保证可靠性使用TCP作为承载协议，使用端口号是179
- C.BGP协议使用keep-alive报文周期性的证实邻居站的连通性
- D.BGP协议不支持路由汇聚功能
正确答案及解析
正确答案
解析
BG P协议是一种外部网关协议，主要用于自治系统之间的路由选择。它采用了TCP作为承载协议，对应的端口是179。PGP协议支持路由汇聚功能，以降低自治系统之间路由表项的个数。
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