单项选择题 A network administrator receives an error message while tring to configure the Ethernet interface of a router with IP address 10.24.24.24/29. which statement explains the reason for this issue？（）

多项选择题 Why do large OSPF networks use a hierarchical design？（）

多项选择题 根据下图，WLANdiagram决定了哪两个事实？（）