B) Guaranteed delivery? Haha, good one! Multicast is all about best-effort delivery, not promises and guarantees. If you want that, you should probably look into unicast routing protocols instead.
E) Prevention of Denial of Service attacks? Now that's just wishful thinking. PIM is great, but it's not a silver bullet against DDoS. Maybe we should ask the network admin to install a firewall or something.
A) Authentication, really? That's more like something I'd expect from IPSEC or SSL, not PIM. This exam is testing our multicast knowledge, not our security chops.
D) Prevention of forwarding loops seems like the obvious choice here. I mean, who doesn't love a good loop-free network? PIM is all about keeping the traffic flowing in the right direction, you know?
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