CCNA系列認(rèn)證CCNA(640-801)單項(xiàng)選擇題每日一練(2019.05.08)

來(lái)源：考試資料網(wǎng)

1
You are unable to connect to the TESTKING1 router. Which of the following command sequences will correct this problem?（）

2 How many usable sub network and usable hosts per subnet result in the network address 201.105.13.0 is sub netted with a mask of /26? （）

3 If NVRAM lacks boot system commands, where does the router look for the Cisco IOS by default?（）

4 Why would a network administrator configure port security on a switch?（）

5 Which OSI layer header contains the address of a destination host that is another network?（）