300-365 · Question #102
An engineer is attempting to send multicast data to all multicast routers in the network with ID 338789750. Which IP address should be used?
The correct answer is B. 224.0.0.2. The question asks which well-known multicast address is used to reach all multicast routers on a local network segment.
Question
An engineer is attempting to send multicast data to all multicast routers in the network with ID 338789750. Which IP address should be used?
Options
- A224.0.0.1
- B224.0.0.2
- C224.0.0.4
- D224.0.0.3
How the community answered
(37 responses)- A3% (1)
- B92% (34)
- D5% (2)
Why each option
The question asks which well-known multicast address is used to reach all multicast routers on a local network segment.
224.0.0.1 is the 'All Hosts' address that targets all multicast-capable hosts on the subnet, not specifically routers.
224.0.0.2 is the IANA-reserved link-local multicast address for the 'All Routers' group, which is received by all multicast-capable routers on the local subnet. Any traffic sent to this address is processed by every router participating in multicast routing on that segment. The network ID value referenced in the question is a distractor and does not change which well-known group address applies.
224.0.0.4 is reserved for DVMRP (Distance Vector Multicast Routing Protocol) routers only, not all multicast routers.
224.0.0.3 is currently unassigned by IANA and has no defined multicast group function.
Concept tested: Well-known IPv4 link-local multicast group addresses
Source: https://www.iana.org/assignments/multicast-addresses/multicast-addresses.xhtml
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