单项选择题 How is the cost of a virtual link in OSPF calculated?（）

多项选择题 You wish to configure IPv6 support on a router which does not have any current IPv4 configuration.Which three steps are used to configure IPv6 with an accompanying IGP in JUNOS software? （）

单项选择题 By default, to which peers will a BGP router advertise routes learned from IBGP peers?（）