1. [单选题]交换机工作在OSI七层模型的哪一层()
A. 物理层
B. 数据链路层
C. 网络层
D. 传输层
2. [单选题]RIP协议负载均衡的路径数量为（）
A. 无限制
B. 最多4条
C. 最多5条
D. 最多6条
3. [多选题]在路由器上，可以使用的命令有：()
A. ping
B. show interfaces
C. show ip route
D. ipconfig
E. wincfg
4. [多选题]There are 2 switches in the Ezonexam LAN, with no routers. Ports 1, 2 & 3 are assigned to VLAN 1 in switch 1 and 2 and ports 4, 5 & 6 are assigned to VLAN 2 in both switches. These two switches are connected together via a trunked link. Which of the conditions below would verify trunk and VLAN operation? (Select all valid answers)
A. Host 1 on VLAN 1 can ping Host 2 on VLAN 1
B. Host 1 on VLAN 1 can ping Host 4 on VLAN 2
C. Host 1 on VLAN 1 can not ping Host 2 on VLAN 1
D. Host 4 on VLAN 2 can not ping Host 1 on VLAN 1
E. Host 4 on VLAN 2 can ping Host 2 on VLAN 2
5. [单选题]下面哪个操作可以使访问控制列表真正生效（）。
A. 将访问控制列表应用到接口上
B. 定义扩展访问控制列表
C. 定义多条访问控制列表的组合
D. 用access-list命令配置访问控制列表
