单项选择题 Which PPP subprotocol negotiates authentication options?（）

单项选择题 You are working in a data center environment and are assigned the address range 10.188.31.0/23.You are asked to develop an IP addressing plan to allow the maximum number of subnets with as many as 30 hosts each.Which IP address range meets these requirements?（）

单项选择题 Assuming the default switch configuration,which approach should you use to configure the extended vlan range(1006 through 4094) on a cisco catalyst 3750 series switch?（）