多项选择题
A.Passive routes are in the process of being calculated by DUAL.
B.EIGRP supports VLSM, route summarization, and routing update authentication.
C.EIGRP exchanges full routing table information with neighboring routers with every update.
D.If the feasible successor has a higher advertised distance than the successor route, it becomes the primary route.
E.A query process is used to discover a replacement for a failed route if a feasible successor is not identified from the current routing information.
单项选择题 Why will a switch never learn a broadcast address（）。
单项选择题 Which commands is necessary to permit SSH or Telnet access to a cisco switch that is otherwise configured for these vty line protocols？（）
多项选择题 As a frame leaves a Layer 3 device, the Layer 2 encapsulation information is changed from what it was when it entered the devicE.For what two reasons can this happen? （）