A.C/I B.Ec/Io C.Eb/No D.FER
A.UATIRequest B.ConnectionRequest+UATIRequest C.ConnectionRequest+RouteUpdate D.UATIRequest+RouteUpdate
A.后者需要重新建立A8連接 B.后者不需要建立A10連接 C.后者需要建立A10連接 D.后者不需重新建立A8連接