CCNA系列认证CCNA(640-553)单项选择题每日一练(2019.03.21)

单项选择题
For the following options， which feature is the foundation of Cisco Self-Defending Network technology？（）
A.secure network platform
B.secure connectivity
C.threat control and containment
D.policy management
单项选择题
Which example is of a function intended for cryptographic hashing？（）
A.MD65
B.SHA-135
C.XR12
D.MD5
单项选择题
You work as a network engineer， do you know an IPsec tunnel is negotiated within the protection of whichtype of tunnel？（）
A.L2F tunnel
B.L2TP tunnel
C.GRE tunnel
D.ISAKMP tunnel
单项选择题
Based on the username global configuration mode command displayed in the exhibit. What does the optionsecret 5 indicate about the enable secret password？（）
A.It is hashed using MD5
B.It is encrypted using a proprietary Cisco encryption algorithm
C.It is hashed using SHA
D.It is encrypted using DH group 5
单项选择题
Which Public Key Cryptographic Standards （PKCS） defines the syntax for encrypted messages andmessages with digital signatures？（）
A.PKCS #7
B.PKCS #8
C.PKCS #10
D.PKCS #12