多项选择题
A.They are always present in the NATt able.
B.They allow connection to be initiated from the outside.
C.They can be configured with access lists，to allow two or more connections to be initiated from the outside.
D.They require no inside or outside interface markings because addresses are statically defined.
单项选择题 Which IPsec security protocol should be used when confidentiality is required？（）
单项选择题 Wich command can you use to manually assign a static IPV6 address to a router interface?（）
单项选择题 In order to allow the establishment of a Telnet session with a router, which set of commands must be configured（）。