在BGP4协议中，当接收到对方打开（open）报文后，路由器采用（ ）报文响应从而建立两个路由器之间的邻居关系。
- A.建立（hello）
- B.更新（update）
- C.保持活动（keepalive）
- D.通告（notification）
正确答案及解析
正确答案
解析
BGP建立邻居后，会通过相互发送Keepalive的数据来维持邻居关系，默认每60秒发送一次，保持时间为180秒，即到达180秒没有收到邻居的Keepalive，便认为邻居丢失，则断开与邻居的连接。
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