单项选择题
A. A session key value is exchanged across the network.
B. A session key never passes across the network.
C. A session key is used as the key for asymmetric data encryption.
D. A session key is used as the key for symmetric data encryption.
多项选择题 Which two statements about the use of SCREEN options are correct? （）(Choose two.)
多项选择题 Which two statements about static NAT are true? （）(Choose two.)
单项选择题 You have configured a UTM profile called Block-Spam, which has the appropriate antispam configuration to block undesired spam e-mails.Which configuration would protect an SMTP server in the dmz zone from spam originating in the untrust zone?（）