单项选择题
A. DHCP
B. VLANs
C. DMZ
D. VPNs
单项选择题 AcompanyutilizestheGFSbackupstandard.Whichofthefollowingdescribes（解释，翻译，描述）thisbackupmethod（方法，方式）？（）
单项选择题 Acompanywantstoexpandtheirstoragecapacityinaflexiblemannerovertheirexistingnetwork.Whichofthefollowingstoragesolutionswouldtheyconsider？（）
单项选择题 Atechniciansupportsusersinaclient/serverenvironment.Ausersuddenlycannotaccessany networkresources.Theusertriedtologontoaknownworkingcomputerbutwasunsuccessful.WhichofthefollowingshouldthetechniciancheckFIRST？（）