A.Host Local→DNS Cache→DNS ServerB.Host Local→DNS Server→DNS CacheC.DNS Server→Host Local→DNS CacheD.DNS Server→DNS Cache→Host Local
A.1+1主备B.N+M互备C.全负荷分担D.N*(1+1)互备
A.GUAMI池配置B.安全参数配置C.SUPI号码段配置D.标识配置