Consider the tunneling technique between two mrouters. Describe how a multicast packet is encapsulated in a unicast packet. How does the mrouter at the other side of the tunnel know it is an...

Consider the tunneling technique between two mrouters. Describe how a multicast packet is encapsulated in a unicast packet. How does the mrouter at the other side of the tunnel know it is an encapsulated packet?

Since there are no centralized controls on IP multicast address assignment, what is the probability that two groups of users choose the same multicast address if they choose the address randomly?