It prevents message looping， Session Advertisement （SA）messages must be RPF checked
RPF check should be done against the route to the source S of the corresponding PIM-SM domain
RPF check should be done against the route to the Rendez-vous Point of the corresponding PIM-SM domain，which originated the SA
RPF checking Session Advertisement （SA） messages will cause message looping
第1题：
A. Sparse mode multicast uses a pull model to send multicast traffic to where it is requested
B. Dense mode multicast uses a push model to flood traffic throughout the network and then prunes the unwanted traffic
C. Dense mode multicast requires explicit join messa ges from their members
D. Sparse mode uses reverse path forwarding (RPF) to prune off redundant flows
E. The primary use of sparse mode multicast is for test labs and router performance testing
第2题：
Which two statements are tru e about the rendezvous point (RP) in a multicast network?（）
第3题：
A. It checks the database for intrablock corruptions.
B. It can detect corrupt pfiles.
C. It can detect corrupt spfiles.
D. It checks the database for interblock corruptions.
E. It can detect corrupt block change tracking files.
第4题：
In order to configure two routers as anycast RPs， which of these requirements， af a minimum， must besatisfied？（）
第5题：
Which two statements are true about the RMAN validate database command?（）
第6题：
Which two statements are true about the rendezvous poin t (RP) in a multicast network?（）
第7题：
Which two of these multicast deployments are most susceptible to attacks from unknown sources？（）
第8题：
A. PAT is not supported.
B. PAT is enabled by default.
C. It supports the address-persistent configuration option.
D. It supports the junos-global configuration option.
第9题：
Which two statements about RPF checks in Multicast Source Discovery Protocol （MSDP） are true？（）
第10题：
Which three statements are true about Source Specific Multicast？（）