Multicast Models

Question 1

What are the benefits of Multicast?

Answer 1

-Multicast sends messages to a specific network members, avoiding broadcast to all nodes.
-Targeted transmission reduces unnecessary message transmissions, cutting network congestion and optimizing bandwidth.
-Multicast supports one-to-many or many-to-many message distribution, enabling efficient communication to multiple recipients.
-Group communication methods include application layer multicast and network-assisted multicast.

Question 2

What are some forms of reliable multicast?

Answer 2

-FIFO multicast: if m1 and m2 are broadcast by the same node and broadcast (m1) -> broadcast (m2), then m1 must be delivered before m2.
-Casual multicast: If broadcast (m1) -> broadcast(m2) then m1 must be delivered before m2.
-Total order multicast: If m1 is delivered before m2 on one node, then m1 must be delivered before m2 on all nodes.
-FIFO-Total order multicast: Combination of FIFO multicast and total order multicast.

Question 3

What is a closed multicast group?

Answer 3

-Only group members are allowed to multicast.
-Enhances reliability and security by restricting message delivery to recipients.
-Limits potential for tampering or interference from external source.