Asymmetric and symmetric ciphers differ in which of the following way（s）？ （） 

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  A . Only symmetric algorithms have a key exchange technology built in B . Asymmetric algorithms are used quite often as key exchange protocols for symmetricalgorithms C . Only asymmetric algorithms have a key exchange technology built in D . Asymmetric algorithms are based on more complex mathematical computatio

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• Which description about asymmetric encryption algorithms is correct？（）

  A . They use the same key for encryption and decryption of data. B . They use different keys for decryption but the same key for encryption of data. C . They use different keys for encryption and decryption of data. D . They use the same key for decryption but different keys for encryption of data.

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  A . Configure dynamic NAT on the firewall. B . Configure the firewall to allow the use of Teredo. C . Configure a link local IPv6 address for the internal interface of the firewall. D . Configure a global IPv6 address for the external interface of the firewall.

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  A .  only operational in routed mode B .  only operational in transparent mode C .  only eight interfaces can belong to an asymmetric routing group D .  operational in both failover and non-failover configurations E .  only operational when the firewall has been configured for failover

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  A．对称数字用户线 B．非对称数字用户线 C．超高速数字用户线 D．速率自适应数字用户线

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• Symmetric, or private-key, encryption is based on ...

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• 约束类型为“角度”（Angle)时，子类型有对称（Symmetric)。（)

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