单项选择题
A RIPv1 Response message includes which of the following fields?（）
A.A B.B C.C D.D
单项选择题 Which RIP message type is used to deliver route information to neighbors?（）
单项选择题 Which RIP message type is used to ask neighbors for updates?（）
多项选择题 What are three characteristics of RIPv1?（）
