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

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Whichkindoftablewillbeusedbymostfirewallstodaytokeeptrackoftheconnectionsthroughthefirewall？（）

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

单项选择题TheenablesecretpasswordappearsasanMD5hashinarouter’sconfigurationfile，whereastheenablepasswordisnothashed（orencrypted，ifthepassword-encryptionserviceisnotenabled）.WhatisthereasonthatCiscostillsupporttheuseofbothenablesecretandenablepasswordsinarouter’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.

单项选择题Which statement best describes the relationships between AAA function and TACACS+， RADIUS based onthe exhibit shown？（）

A.TACACS+ - P4S1 and P4S4RADIUS - P4S2 and P4S3
B.TACACS+ - P4S2 and P4S4RADIUS - P4S1 and P4S3
C.TACACS+ - P4S1 and P4S3Actual RADIUS - P4S2 and P4S4
D.TACACS+ - P4S2 and P4S3RADIUS - P4S1 and P4S4

单项选择题Whatwillbeenabledbythescanningtechnology-TheDynamicVectorStreaming（DVS）？（）

A.Firmware-level virus detection
B.Signature-based virus filtering
C.Layer 4 virus detection
D.Signature-based spyware filtering