单项选择题
Which type of connection must be established before BGP peers can exchange update messages?（）
A.SSL B.UDP C.TCP D.SSH
多项选择题 What are two advantages of BGP route aggregation?（） (Choose two.)
单项选择题 On which destination port in the Layer 4 header does BGP listen?（）
单项选择题 Which CLI command displays the metrics associated with each advertised route?（）
