Which statement about IP-directed broadcast is true?
Click on the arrows to vote for the correct answer
A. B. C. D.A.
IP-directed broadcast is a method of sending a single IP broadcast packet to a specific group of hosts on a network. This is different from a standard IP broadcast, which sends a packet to all hosts on the network. IP-directed broadcast is often used to send packets to all hosts on a specific subnet or to a specific group of hosts.
Regarding the given options:
A. This statement is incorrect. When a directed broadcast packet reaches a switch that is directly connected to its destination subnet, the switch will forward the packet to the destination subnet without "exploding" it into a broadcast.
B. This statement is incorrect. An IP-directed broadcast is not a multicast group. Multicast packets are sent to a specific multicast group, while an IP-directed broadcast is sent to a specific subnet.
C. This statement is correct. An IP-directed broadcast is an IP packet whose destination address is a valid unicast address, but which originates from a node that is itself part of that destination subnet. The destination address is modified to be the broadcast address of the subnet.
D. This statement is incorrect. When a switch receives an IP-directed broadcast, it forwards the packet only to the interfaces that are in the same subnet as the original sender. Switches do not forward IP-directed broadcasts to interfaces that are not in the same subnet as the original sender.
In summary, Option C is the correct statement about IP-directed broadcast, which is an IP packet whose destination address is a valid unicast address, but which originates from a node that is itself part of that destination subnet. The destination address is modified to be the broadcast address of the subnet.