单项选择题
A.Route entry for the session changed.
B.Security policy for the session changed.
C.The ARP table entry for the source IP address timed out.
D.No traffic matched the session during the timeout period.
多项选择题 InJUNOSSoftware，whichthreepacketelementscanbeinspectedtodetermineifasessionalreadyexists？（）
多项选择题 WhichtwostatementsaboutJUNOSSoftwarepackethandlingarecorrect？（）
单项选择题 HostAopensaTelnetconnectiontoHostB.HostAthenopensanotherTelnetconnectiontoHostB.TheseconnectionsaretheonlycommunicationbetweenHostAandHostB.Thesecuritypolicyconfigurationpermitsbothconnections.HowmanyflowsexistbetweenHostAandHostB？（）