多項選擇題In Multicast VPN （MVPN） implementations， which two of the following statements are regarding the DefaultMDT Group？（）

A.It is used for PIM control traffic
B.It is optionally configured for a high bandwidth multicast source to reduce multicast traffic replication to uninterested PE routers
C.Within the VPF configuration in the PE router， multiple Default MDT groups are configured so each VPF can support multiple multicast sources
D.There is a reduced multicast state in the MPLS core P routers
E.When multicast traffic exceeds a certain configured threshold， traffic from the Data MDT is switched to the Default MDT to conserve bandwidth


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1.單項選擇題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

2.多項選擇題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

3.單項選擇題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

4.多項選擇題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

5.單項選擇題The mechanisms for distributing LDP are：（）

A.LDP and RSVP
B.RSVP and CEF
C.CEF and the FIB table
D.UDP and IP
E.A and B