多项选择题
What are two advantages of BGP route aggregation?（） (Choose two.)
A. It can reduce routing table size. B. It allows for optimal route selection. C. It can reduce the number of routing updates. D. It always shortens the attribute list for the aggregated route.
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?（）
单项选择题 Which CLI command displays the IS-IS level used by each interface?（）
