单项选择题
A user reports that they are unable to reach a particular website. The user had no issues reaching the site earlier in the day. Which of the following is the MOST likely cause of the lack of access？（）
A.The VLAN is misconfigured
B.The user has an improperly configured NIC
C.The DHCP server is down
D.The DNS server is down
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Users report that they are unable to connect to a server. An administrator confirms that it is unreachable across the network. Other administrators have been working in the server room throughout the day. Which of the following is the NEXT step the administrator should take？（）
A. Verify the configuration of the connected port on the network switch.
B. Reboot the server.
C. Install a new NIC on the server.
D. Verify that network cables are connected. -
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WhichofthefollowingbackupmediawouldbeMOSTappropriateforrouterconfigurationfiles？（）
A.Optical
B.Tape
C.Flash drive
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