In OSPF, do DR and BDR elected in a broadcast network listen on both 224.0.0.6 and 224.0.0.5?

In OSPF (Open Shortest Path First), when a network is operating in broadcast mode, designated routers (DR) and backup designated routers (BDR) are crucial for efficient routing. The reason why the answer is true is rooted in how OSPF manages multicast communication.

The DR and BDR facilitate the exchange of routing information among other OSPF routers within the same broadcast network. These routers listen on two multicast addresses: 224.0.0.5 and 224.0.0.6.

The address 224.0.0.5 is used for all OSPF routers, which means all OSPF-enabled routers on the network segment can receive updates sent to this address. Conversely, the address 224.0.0.6 is specifically allocated for the DR and BDR, which enables them to receive messages intended solely for them.

In essence, while all OSPF routers listen to 224.0.0.5, the DR and BDR are also specifically set up to listen on 224.0.0.6. This dual listening capability allows them to efficiently manage and disseminate network topology information, providing a more streamlined routing process across the network.