Two BGP peers connected through a routed firewall are unable to establish a peering relationship. What could be the most likely cause？（） ["BGP peers must be Layer 2-adjacent.","EBGP multihop is not configured.","The firewall is not configured to allow IP protocol 89.","The firewall is not configured to allow UDP 179."]
某人持有总市值为100万港元的股票5种，他担心市场利率上升，想利用恒指期贷对
社会化
控制系统的数学模型在时域中常用的类型有（）。 ["微分方程","差分方程","结构图","状态方程"]
what mulcast envionment use RP？
基督
