Which technology can prevent a workstation from obtaining a DHCP address?

Spanning Tree Protocol (STP) can prevent a workstation from obtaining a DHCP address because it causes ports to transition through several states (blocking, listening, learning) before reaching the forwarding state. During these initial states, the port does not forward frames, including DHCP requests and offers. A workstation connected to a port in a non-forwarding state will time out its DHCP request. VTP (VLAN Trunking Protocol) manages VLAN configurations but doesn't directly impact port forwarding states. 802.1Q is a VLAN tagging standard and doesn't prevent frame forwarding. DTP (Dynamic Trunking Protocol) negotiates trunking, but like VTP and 802.1Q, it doesn't inherently block frames from being forwarded on a port.