问答题

POP3 服务器默认使用（）协议的（）端口。

A.UDP
B.TCP
C.SMTP
D.HTTP@@@SXB@@@A.21
B.25
C.53
D.110

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某用户得到的网络地址范围为 110.15.0.0~110.15.7.0，这个地址块可以用（）表士，其中可以分配（）个可用主机地址。

A.15.0.0~110.15.7.0，这个地址块可以用（）表士，其
B.110.15.0.0/20
B.110.15.0.0/21
C.110.15.0.0/16
D.110.15.0.0/24@@@SXB@@@A.2048
B.2046
C.2000
D.2056

All three types of cryptography schemes have unique function mapping to specific applications. For example, the symmetric key( ) approach is typically used for the encryption of data providing ( ) , whereas asymmetric key cryptography is mainly used in key ( ) and nonrepudiation , thereby providing confidentiality and authentication. The hash ( ) (noncryptic), on the other hand, does not provide confidentiality but provides message integrity, and cryptographic hash algorithms provide message ( ) and identity of peers during transport over insecure channels.

A.Cryptography
B.decode
C.privacy
D.security@@@SXB@@@A.Conduction
B.confidence
C.confidentiality
D.connection@@@SXB@@@A.Authentication
B.structure
C.encryption
D.exchange@@@SXB@@@A.Algorithm
B.Secure
C.structure
D.encryption@@@SXB@@@A.Confidentiality
B.integrity
C.service
D.robustness