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單項選擇題

Examine the following items， which one offers a variety of security solutions， including firewall， IPS， VPN，antispyware， antivirus， and antiphishing features？（）

A.Cisco IOS router
B.Cisco PIX 500 series security appliance
C.Cisco 4200 series IPS appliance
D.Cisco ASA 5500 series security appliance

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單項選擇題

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

單項選擇題

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

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