Before a Diffie-Hellman exchange may begin， the two parties involved must agree on what？（）

A.Two secret keys
B.Two nonsecret keys
C.Two secret numbers
D.Two nonsecret numbers

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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 kind of table will be used by most firewalls today to keep track of the connections through thefirewall？（）

A.reflexive ACL
B.dynamic ACL
C.queuing
D.netflow
E.state

单项选择题

The enable secret password appears as an MD5 hash in a router’s configuration file， whereas the enablepassword is not hashed （or encrypted， if the password-encryption service is not enabled）. What is thereason that Cisco still support the use of both enable secret and enable passwords in a router’sconfiguration？（）

A.The enable password is present for backward compatibility.
B.Because the enable secret password is a hash， it cannot be decrypted. Therefore， the enable password is used to match the password that was entered， and the enable secret is used to verify that the enablepassword has not been modified since the hash was generated.
C.The enable password is considered to be a router’s public key， whereas the enable secret password is considered to be a router’s private key.
D.The enable password is used for IKE Phase I， whereas the enable secret password is used for IKE Phase II.

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