单项选择题 Which BGP path attribute is Cisco proprietary?（）

单项选择题 Which BGP attribute is used by BGP to prevent routing loops?（）

单项选择题 The 192.168.0.0 network is not being propagated throughout the network. Observe the BGP configuration commands from the advertising router. What is the reason the 192.168.0.0 route is not being advertised? （）