What type of address is used for OSPF multicast packets?

OSPF, which stands for Open Shortest Path First, uses multicast packets to efficiently communicate routing information between routers within the same network segment. The specific multicast address used for OSPF packets is 224.0.0.5. This address is part of the well-known multicast addresses reserved for network protocols.

When OSPF is enabled on routers, they send routing updates and other OSPF messages to this address, which is designated for all OSPF routers, allowing them to receive the information without the need for direct unicast communication. This approach helps to minimize network traffic since multiple routers can listen to the same packets sent to the multicast address, rather than each router needing to establish individual connections with every other router.

The other addresses mentioned in the choices are not used for OSPF multicast packets. For example, 239.255.255.1 is part of the administratively scoped multicast addresses and is not specifically for OSPF, while 255.255.255.255 is the limited broadcast address, and 192.168.1.1 is a private IP address typically used for a specific device, not for OSPF communications.