Which multicast group address is specifically for all routers on a network?

• A. All devices
• B. Network address
• C. All routers
• D. Specific routers

Answer: (C)

The correct answer pertains to the multicast group address that is designated for communication among routers within a network. Multicast addresses are a special class of addresses used for sending a single packet to multiple destinations simultaneously, rather than broadcasting it to all devices or targeting specific ones.

The multicast group address reserved for all routers is 224.0.0.2. This address allows all routers on a local network segment to receive multicast traffic that is intended for them. This is crucial for various routing protocols, as it ensures that routers can maintain proper routing tables and share information efficiently.

Other choices refer to broader classifications or specific targets that do not serve the same purpose. A multicast address for "all devices" would typically indicate broadcast communication, which is not limited to routers. The term "network address" does not specify a multicast group and usually refers to identifying an entire network segment rather than a select group of devices. Lastly, "specific routers" would suggest targeting individual routers instead of the broader group needed to streamline the communication among all routers on a segment.

Overall, identifying the correct multicast address for all routers helps ensure effective routing protocol operations and network management.