单项选择题

A network administrator wants to detect a login attack against a router. What IOS command can make the attack recorded in syslog server？（）

A.Logging detect fail-login
B.Login on-failure log
C.Login detect login-failure log
D.Logging login on-failure
E.none of the above

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多项选择题

Pick the 4 valid ATM Cell Header fields：（）

A.GFC-4 bits of generic flow control
B.Forward-explicit congestion notification（FECN）
C.VCI-16 bits of virtual channel identifier
D.CLP-1 bit of congestion loss
E.HEC-8 bit of header error control
F.ATM Discard Eligibility（DE）bit

单项选择题

BGP best route selection process is based on what ？（）

A.lowest cost
B.highest bandwidth
C.lowest hop-count
D.path attributes
E.lowest delay

多项选择题

Which two statements are true about RPF checks in MSDP（Multicast Source Discovery Protocol）？（）

A.It prevents message looping，Session Advertisement（SA）messages must be RPF checked
B.RPF check should be done against the route to the Rendez-vous Point of the corresponding PIM-SM domain，which originated the SA
C.RPF checking Session Advertisement（SA）messages will cause message looping
D.RPF check should be done against the route to the source S of the corresponding PIM-SM domain