单项选择题
A. The router will use path1 when it is available and stable.
B. The router will use path3 when it is available and stable.
C. The router will attempt to establish path2 only when path1 and path3 are down.
D. The router will attempt to establish path1 only when path2 and path3 are down.
单项选择题 When importing or exporting routing information using routing policy, the import or export is always done from which point of view?（）
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?（）