In an MPLS network, what is true regarding label distribution control mode?

In MPLS (Multiprotocol Label Switching) networks, label distribution control mode is a critical concept that helps in the association of labels with FECs (Forwarding Equivalence Classes). The correct answer indicates that the downstream LSR (Label Switching Router) is responsible for determining the label that is bound to a specific FEC.

In MPLS, this is particularly relevant in the context of how labels are communicated and established between routers. When a label is assigned to a particular FEC, the downstream LSR can assign the label based on its own considerations, such as its internal routing logic and policies. As a result, it ensures that traffic destined for a specific FEC is labeled appropriately as it traverses the network, facilitating efficient switching and routing based on those labels.

The other choices do not accurately capture the mechanics of label distribution in MPLS:

• The second option incorrectly implies that a label can be distributed without a request in Downstream on Demand mode. In this mode, a request must be made before a label is assigned, making this statement inaccurate.

• The third option states that a label request is needed in Downstream Unsolicited mode, which contradicts the nature of this mode, where labels are distributed without