And we're just going to finish this video with just some terminology.
Much of the terminology I've already discussed, so this will be just a
quick review. So in the multicast stream, we typically call it a stream.
That's your data like your voice or your video that's going out just into
this multicast address.
We call that a multicast stream.
You might also hear that referred to as a multicast channel.
I've also seen it called that as well.
So a multicast source, right?
That's the actual server that's generating the multicast packets.
So if you're ever are reading multicast configuration guys or documents
and they talk about the MCast source or just the source, that's what it
is. It's the server, it's typically a server that's generating the multicast
traffic. And then your laptop or your PC or your tablet that's receiving
that traffic, you are a receiver, a multicast receiver.
GDA, that stands for group destination address, right?
Because at layer two and at layer three, the address is not going to a
broadcast, it's not going to a particular unicast, it's going to a group.
So GDA is group destination address.
We've also talked about the multicast distribution tree, which means,
okay, if there's one or more routers in between the source and the receivers,
there has to be some path built.
So the routers know that when the multicast comes in to forward it down
various interfaces until it reaches the receiver.
So that path from the source to the receivers is called building the multicast
distribution tree.
And we talked a little bit about how that can be built either via a push
model, which means flooded everywhere or a pull model.
We talked about that.
And then I already defined PIM.
PIM is a multicast routing protocol and it stands for protocol independent
multicast. Not going to go into why is it called protocol independent.
That would be more of a layer three discussion, but PIM is the most popular
of the multicast routing protocols.
So that concludes this particular discussion of an introduction to multicast.
In the next video, we're going to start going into IgMP and look at the
details of that.