CCNA系列認(rèn)證CCNA(640-802)單項(xiàng)選擇題每日一練(2019.11.11)

來(lái)源：考試資料網(wǎng)

1 Which layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-in security mechanisms?（）

2 Acknowledgements, sequencing, and flow control are characteristics of which OSI layer?（）

3 Which IP address can be assigned to an Internet interface?（）

4 Which command encrypts all plaintext passwords?（）

5 Which command is used to see the path taken by packets across an IP network?（）

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