CCNA系列認證CCNA(640-553)單項選擇題每日一練(2019.03.21)

來源：考試資料網(wǎng)

1 For the following options， which feature is the foundation of Cisco Self-Defending Network technology？（）

2 Which example is of a function intended for cryptographic hashing？（）

3 You work as a network engineer， do you know an IPsec tunnel is negotiated within the protection of whichtype of tunnel？（）

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4 Based on the username global configuration mode command displayed in the exhibit. What does the optionsecret 5 indicate about the enable secret password？（）

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5 Which Public Key Cryptographic Standards （PKCS） defines the syntax for encrypted messages andmessages with digital signatures？（）

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