What is the scope and address range for multicast addresses that are reserved for use inside private domains?
- administratively scoped: 239.0.0.0-239.255.255.255
- global scope: 224.0.1.0-238.255.255.255
- local scope: 239.0.0.0-239.255.255.255
- local scope: 224.0.0.0-224.0.0.255
Explanation: The multicast IP address space (Class D) is categorized into three primary functional groups based on their scope of use:
- Administratively scoped addresses: These range from 239.0.0.0 through 239.255.255.255 and are specifically reserved for use inside private domains.
- Local-scope addresses: These range from 224.0.0.0 through 224.0.0.255 and are reserved by IANA for network protocol use; they are never forwarded off the local network regardless of their Time to Live (TTL) value.
- Global-scope addresses: These range from 224.0.1.0 through 238.255.255.255 and are allocated dynamically across the internet.
The administratively scoped range acts similarly to RFC 1918 private unicast addresses, allowing organizations to use multicast internally without conflicting with addresses used on the public internet.
Related exam: Modules 8 – 13: Checkpoint Exam: Network Routing Answers (CCNP ENCOR v9)
