多项选择题
A.2811 B.2801 C.2851 D.2821 E.1841 F.3825
A.Providing technical customer support B.Changing configurations C.Updating software D.Monitoring network performance E.Replacing hardware F.Scheduling backups
A.broadcast, multicast B.unicast, broadcast C.broadcast, unicast D.multicast, unicast E.broadcast, broadcast F.unicast, multicast