1. [多选题]CDP is being used throughout the Ezonexam network. What are two reasons why the Ezonexam network administrator would use CDP? (Choose two)
A. To determine the status of network services on a remote device
B. To obtain the IP Address of a connected device in order to telnet to the device
C. To verify the type of cable interconnecting two devices
D. To verify Layer 2 connectivity between two devices when Layer 3 fails
E. To obtain VLAN information from directly connected swticehs
F. F. To determine the status of the routing protocols between directly connected routers
G. G. To support automatic network failover during outages
2. [单选题]扩展IP访问权限表的表号范围是：()
A. 1—100
B. 1-99
C. 100-199
D. 800-899
3. [单选题]FTP工作在OSI哪一层（）
A. 会话层
B. 表示层
C. 传输层
D. 应用层
