单项选择题
Which of the following should be done FIRST before installing NOS patches in a production environment？（）
A.Install patches on non critical servers
B.Install patches in test environment
C.Install patches on a PC
D.Install patches on critical servers
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Auserreportsthattheyareunabletoreachaparticularwebsite.Theuserhadnoissuesreaching thesiteearlierintheday.WhichofthefollowingistheMOSTlikelycauseofthelackofaccess？（）
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 -
单项选择题
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. -
单项选择题
Auserreportsthattheyareunabletoprinttoaremoteprinter.Whichofthefollowingshouldthe techniciancheckFIRST？（）
A.Printer driver
B.Protocol stack
C.Network connectivity
D.Correct patch application
