单项选择题
A.It cannot support UDP flows.
B.It cannot ensure each TCP connection follows a legitimate TCP three-way handshake.
C.It cannot detect application-layer attacks.
D.The status of TCP sessions is retained in the state table after the sessions terminate.
单项选择题 WhichstatementbestdescribesCiscoIOSZone-BasedPolicyFirewall？（）
单项选择题 Examinethefollowingoptions，wheneditingglobalIPSsettings，whichonedeterminesiftheIOS-basedIPSfeaturewilldroporpermittrafficforaparticularIPSsignatureenginewhileanewsignatureforthatengineisbeingcompiled？（）
单项选择题 AsacandidateforCCNAexamination，whenyouarefamiliarwiththebasiccommands，ifyouinputthecommand"enablesecretlevel5password"intheglobalmode，whatdoesitindicate？（）