CCNP/CCDP Switch (642-813) practice questions: Multicast traffic 

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Q8. Which of the following is true of Multicast traffic?

         A. In Multicast traffic, one copy of each packet sent to every host computer. For example, if there are n hosts, the number of times a packet is sent over the network is 'n'.

         B. In Multicast traffic, only one copy of each packet using a broadcast address.

         C. In Multicast traffic, one copy of each packet is sent out to a host group identified by a single IP destination address.

        D. In Multicast traffic, one copy of each packet is sent out using Class E address.

Correct Answer: C

Explanation: 

IP Multicasting is characterized by the following:
1. IP Multicasting uses User Datagram Protocol (UDP) protocol. UDP is a connectionless protocol and doesn't have features like flow control, error recovery.
2. The application server of a Multicast group does not know the Unicast address of any host, and all recipients share the same Multicast network address. This ensures anonymity of clients joining the Multicast network.
3. Multiple applications on a host can use single group address.
4. Hosts can join and depart a Multicast group dynamically.