Use A for this item. A T1 point-to-point circuit provides 1.544 Mbps of bandwidth. T1 service is a legacy digital carrier technology built from twenty-four 64-kbps DS0 channels plus framing overhead. In Cisco CCNA 200-301 v1.1, Network Fundamentals questions frequently test the practical boundary between similar features: what the feature does, where it is configured, and what problem it is meant to solve. 2.048 Mbps is associated with E1 service, while the larger values describe higher-capacity carrier circuits. A clean way to validate the answer is to map the wording of the scenario to the actual device function. If the feature supplies addressing, forwarding, authentication, trunking, route selection, or controller communication, the answer must match that function exactly rather than a nearby protocol name.