单项选择题
A.HostA is not on the same subnet as its default gateway
B.The address of SwitchA is a subnet address
C.The Fa0/0 interface on RouterA is on a subnet that cannot be used
D.The serial interfaces of the routers are not on the same subnet
E.The Fa0/0 interface on RouterB is using a broadcast address
单项选择题 Refer to the exhibit。A problem with network connectivity has been observed.It is suspected that the cable connected to switch port Fa0/9 on Switch 1 disconnected.What would be an effect of tis cable being disconnected?（）
多项选择题 Refer to the exhibit. The network shown in the diagram is experiencing connectivity problems. Which of the following will correct the problems? （）
多项选择题 Refer to the graphic. R1 is unable to establish an OSPF neighbor relationship with R3. What are possible reasons for this problem?（）