多项选择题
What are two uses of the AS Path attribute?（） (Choose two.)
A. route selection B. loop avoidance C. determining equal cost paths for reachablilty D. defining the application of other BGP attributes
多项选择题 Which three BGP attributes are always communicated in a BGP update packet? （）(Choose three.)
单项选择题 Which packet is sent in response to a BGP Open packet?（）
单项选择题 Once the TCP connection is established, which message type initiates the BGP peering process?（）
