In Junos, which layer is primarily responsible for determining how packets are forwarded?

The network layer is crucial in determining how packets are forwarded through a network. It is responsible for addressing and routing packets from the source to the destination across multiple hops. This layer uses logical addressing, such as IP addressing, to ensure that data can navigate through interconnected networks effectively. Functions at this layer include packet forwarding, routing decisions, and maintaining information about link states.

By managing these tasks, the network layer enables the transfer of data between devices over various networks, ensuring that every packet reaches its correct destination via the best available path. This forwarding process involves protocols like IP (Internet Protocol), which provide mechanisms for packet handling and route selection, making the network layer the correct choice for understanding packet forwarding in Junos.