多项选择题
A.enabling network migrations B.conserving public IP addresses C.allowing stateful packet inspection D.preventing unauthorized connections from outside the network
A.conserving public IP addresses B.allowing stateful packet inspection C.preventing unauthorized connections from outside the network D.allowing networks with overlapping private address space to communicate
A.DNS traffic is denied. B.HTTP traffic is denied. C.FTP traffic is permitted. D.SMTP traffic is permitted.