单项选择题
A.denial of service
B.brute force
C.reconnaissance
D.Trojan horse
单项选择题 Thecommandframe-relaymapip10.121.16.8102broadcastwasenteredontherouter.Whichofthefollowingstatementsistrueconcerningthiscommand？（）
多项选择题 Asingle802.11gaccesspointhasbeenconfiguredandinstalledinthecenterofasquareoffice.Afewwirelessusersareexperiencingslowperformanceanddropswhilemostusersareoperatingatpeakefficiency.Whatarethreelikelycausesofthisproblem?(Choosethree.)（）
多项选择题 Whataretworeasonsthatanetworkadministratorwoulduseaccesslists?(Choosetwo.)（）。