CCNP/CCDP Switching (642-813) practice questions: Class D network address range

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Q10. Which of the following is reserved Class D address range meant for local network segment?

         A. 224.0.0.0 through 239.255.255.255

         B. 224.0.0.0/24

         C. 224.0.1.0 through 238.255.255.255

          D. 239.0.0.0/8

Correct Answer:B

Explanation: 

1. Class D address space used for IP Multicast. All IP Multicast-group addresses will fall in this range:
224.0.0.0 - 239.255.255.255 

2. The addresses in the range 224.0.0.0 - 224.0.0.255 are reserved for use by network protocols on a local network segment. Packets with these addresses should never be forwarded by a router. The time-to-live (TTL) for these packets is always set to a value 1 by the originating router, so that these packets never cross local segment.

3. The address range 239.0.0.0 - 239.255.255.255 are called Administratively Scoped Addresses and analogous to private addresses 10.0.0.0/8.

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