Asynchronous transfer mode (ATM) can be transported over multi-protocol label switching (MPLS) networks. What must ATM do that MPLS does not?

The correct answer is that ATM must add an additional header. In an ATM network, data is packaged into fixed-size cells, each of which contains a header that is used for routing and control purposes. This header includes information necessary for switch processing, such as virtual circuit identifiers and payload type indications.

In contrast, MPLS operates differently. While it does involve tags for routing and forwarding, these tags are not structured in the way ATM headers are. As a result, when transmitting ATM traffic over MPLS, the ATM cells maintain their inherent header requirements to ensure proper handling and delivery of the data within the ATM framework.

The other options do not accurately describe a requirement that ATM must fulfill in relation to MPLS. For example, ATM does not inherently lose data integrity; it is designed for reliable data transfer. Additionally, ATM does not necessarily require greater bandwidth than MPLS, nor is increasing latency a requirement for transmission. These aspects instead depend on the specific implementation and the type of data being transported.