Free Cisco 300-420 Actual Exam Questions - Question 5 Discussion
A network engineer must design a multicast solution based on:
* Many-to-many communications between the users and sources
* Support of up to 50 multicast sources
* Users that must register for steams
Which multicast solution must the engineer select?
It’s A for me. Bidirectional PIM (B) is mostly for one-to-many or many-to-one scenarios and doesn’t handle user registration the way ASM does. Source-Specific Multicast (C) is more for one-to-many with known sources, so it doesn’t fit many-to-many well. Multicast VPN (D) is focused on extending multicast over VPNs, which isn’t the main need here. Since we have many sources and users needing to register for streams, Any Source Multicast fits best.
I think option A makes the most sense, but from a different angle: ASM supports dynamic source discovery and allows receivers to register interest without knowing all sources upfront. Since there are up to 50 sources, SSM (C) would be tough because it needs pre-knowledge of sources. Bidirectional PIM (B) doesn’t really handle user registration well. So, A fits the many-to-many and user registration requirements better than the others here.
D imo, Multicast VPN seems less likely since it's mainly for inter-site multicast over VPNs. The many-to-many with multiple sources points more towards A or B, but user registration means ASM (A) fits better here.
This one’s tricky, but since it’s many-to-many with up to 50 sources, A (Any Source Multicast) fits better. Bidirectional PIM (B) is mainly for many-to-many too, but it doesn’t handle source registration as cleanly. Source-Specific Multicast (C) is more for one-to-many, so it’s not ideal here. Multicast VPN (D) seems unrelated since that’s for VPN multicast scenarios. So, going with A based on the number of sources and the need for user registration.
B, I’m confused about the "users that must register for streams" part. Does that mean IGMP or MLD is involved? Also, do we know if the network supports PIM Sparse Mode or Dense Mode? The choice between ASM and SSM usually depends on whether sources are known or if any source is allowed. The many-to-many and 50 sources hint at Bidirectional PIM maybe, but the registration bit makes me unsure. Would love some clarification on the network environment assumptions here.