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？（）
A.The address is abroadcast address. B.The Ehernet interface is faulty. C.VLSM-capable routing protocols must be enable first on the router. D.This address is a network address.
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？（）
单项选择题 Which statement is true，as relates to classful or classless routing？（）
