CCNA系列認(rèn)證單項(xiàng)選擇題每日一練(2020.04.27)

來源：考試資料網(wǎng)

1 Which Cisco Catalyst switches fit in the access area？（）

2 You have a network that supports VLSM and you need to reduce IP address waste in your point to point WAN links. Which of the masks below would you use?（）

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3 Which command shows your active Telnet connections?（）

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4 A receiving host computes the checksum on a frame and determines that the frame is damaged.The frame is then discarded.At which OSI layer did this happen?（）

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5 Which protocol is an open standard protocol framework that is commonly used in VPNs,to provid secure end-to-end communication?（）

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