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Multicasting is a vital topic on your BCMSN, CCNP, and CCIE exams, and it can also be really confusing when you very first start studying it. Multicasting uses ideas that are in contrast to something you have run into in your routing protocol research, and that can throw you at initial. This striking http://www.indyarocks.com/blog/2291244/Get-Your-Annual-Free-Credit-Report-Why-Buy-It encyclopedia has various ideal warnings for where to do it. I speak from knowledge that multicasting is like any other Cisco technologies - learn the basics, master the fundamentals, and then construct your expertise on that foundation. A single such fundamental is the RPF Verify, or Reverse Path Forwarding Examine. A basic distinction in between unicasting and multicasting is that a unicast is routed by sending it toward the destination, although a multicast is routed by sending it away from its source. "toward the destination" and "away from its supply" sound like the identical factor, but they are not. Browse this hyperlink http://www.indyarocks.com/blog/2290451/Renewing-Your-Domain-Name-Is-Important to read the meaning behind it. A unicast is going to follow a single path from source to destination. The only element the routers care about is the destination IP address - the source IP address is not a element. With multicast routing, the destination is a multicast IP group address. Http://Blogs.Rediff.Com/Hintsreviewjumbo/2015/06/10/Renewing Your Domain Name Is Important/ contains additional information about the inner workings of it. It really is the multicast routers job to determine which paths will lead back to the supply upstream and which paths are downstream from the source. Get new info on this affiliated use with - Visit this link http://www.colourlovers.com/lover/helpfulhintssleet. Reverse Path Forwarding refers to the routers behavior of sending multicast packets away from the supply rather than toward a particular destination. The RPF Examine is run against any incoming multicast packet. The multicast router examines the interface that the packet arrived on. If the packet comes in on an upstream interface - that is, an interface located on the reverse path that leads back to the source - the packet passes the verify and will be forwarded. If the packet comes in on any other interface, the packet is dropped. The RPF Check serves to verify the integrity of your multicasting network, and also serves as a reminder that the simple operation of multicasting is a lot diverse than unicasting.