Routing Requirements

AD

To communicate between two devices, there are two main routing requirements:

1. End-to-End Communication Path: For communication to occur between two devices, there must be an end-to-end communication path. This means that the devices must be able to send and receive data to each other through a network. This path can involve multiple devices, routers, and networks, and the data must be able to travel from the source device to the destination device without interruption.

2. Routing Information on Participating Layer 3 Devices: To ensure that data travels through the correct path, the participating Layer 3 devices must have routing information. Routing information includes network addresses and paths to reach other devices on the network. This information is used by the devices to forward data to the correct destination. The routing information is maintained in the devices' routing tables, which are updated as the network topology changes.

Therefore, options C and D are both correct as hosts on the same Layer 3 broadcast domain must have the correct routing information on the participating Layer 3 devices to communicate with each other, and end-to-end communication path is required to ensure that the devices can send and receive data to each other through the network.

Option B is incorrect as hosts on the same Layer 2 broadcast domain can communicate with each other without the need for routing information or devices because Layer 2 operates on MAC addresses, which are used to directly communicate with devices on the same broadcast domain.