A help desk technician is tasked with moving a user's computer to a makeshift office for renovations. Upon moving the computer, the technician notices the network card will not utilize anything beyond

DSL is a WAN technology for internet access and does not directly dictate the local network card's duplex or speed.

An unmanaged switch would typically allow for full-duplex communication and auto-negotiate to higher speeds like 100Mbps or 1Gbps, not restrict to 10Mbps half duplex.

NIC teaming combines multiple network cards for increased bandwidth or redundancy and would not cause a single adapter to be limited to 10Mbps half duplex.

Connecting to a hub forces a network interface to operate in half-duplex mode at a lower speed, typically 10Mbps, because hubs are shared media devices that do not manage collisions and broadcast all traffic to all ports. This behavior matches the described symptom of the network card.