350-401 · Question #237
Which of the following multicast address ranges match the administratively scoped block? (Choose two.)
The correct answer is A. 239.0.0.0 to 239.255.255.255 D. 239.0.0.0/8. The administratively scoped multicast address block is defined as 239.0.0.0/8, which covers the range from 239.0.0.0 to 239.255.255.255.
Question
Options
- A239.0.0.0 to 239.255.255.255
- B232.0.0.0 to 232.255.255.255
- C224.0.0.0 to 224.0.0.255
- D239.0.0.0/8
- E224.0.1.0/24
How the community answered
(49 responses)- A90% (44)
- B6% (3)
- C2% (1)
- E2% (1)
Why each option
The administratively scoped multicast address block is defined as 239.0.0.0/8, which covers the range from 239.0.0.0 to 239.255.255.255.
The range 239.0.0.0 to 239.255.255.255 accurately defines the entire administratively scoped multicast address block, which is designated for private use within an organization.
The range 232.0.0.0 to 232.255.255.255 (232.0.0.0/8) is designated for Source-Specific Multicast (SSM), not administratively scoped multicast.
The range 224.0.0.0 to 224.0.0.255 is reserved as the "Local Network Control Block" for local subnet control traffic, not for administratively scoped purposes.
239.0.0.0/8 is the CIDR notation for the administratively scoped multicast address block, encompassing all addresses within the 239.0.0.0 to 239.255.255.255 range.
224.0.1.0/24 is a sub-range within the internetwork control block, often used for specific protocol control traffic, but it is not the administratively scoped block.
Concept tested: IPv4 Multicast address ranges and scoping
Source: https://www.iana.org/assignments/multicast-addresses/multicast-addresses.xhtml
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