单项选择题
Which command encrypts all plaintext passwords?（）
A. Router(config)#password-encryption B. Router(config)#service password-encryption C. Router#service password-encryption D. Router# password-encryption
单项选择题 Which encapsulation type is a Frame Relay encapsulation type that is supported by Cisco routers?（）
单项选择题 What is the default administrative distance of OSPF?（）
单项选择题 Which address is the IPV6 all-RIP-routers muticast group address that is used by RIPng as the destaion address?（）
