多项选择题 In which three ways are C-BGP and E-BGP sessions similar?（）

单项选择题 An OSPF non-backbone area allows external routes to be flooded within the area. These externalroutes are propagated into other areas. However, external routes from other areas are not allowed to enter this area. Which type of OSPF area does this describe?（）

单项选择题 In JUNOS software, how is route summarization at the L1/L2 border configured?（）