What is a cause for unicast flooding?
A.
Unicast flooding occurs when multicast traffic arrives on a Layer 2 switch that has directly
connected multicast receivers.
B.
When PIM snooping is not enabled, unicast flooding occurs on the switch that interconnects the
PIM-enabled routers.
C.
A man-in-the-middle attack can cause the ARP cache of an end host to have the wrong MAC
address. Instead of having the MAC address of the default gateway, it has a MAC address of the
man-in-the-middle. This causes all traffic to be unicast flooded through the man-in-the-middle,
which can then sniff all packets.
D.
Forwarding table overflow prevents new MAC addresses from being learned, and packets
destined to those MAC addresses are flooded until space becomes available in the forwarding
table.