Why enable PortFast on a switch port connected to an end host? (Choose two.)
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Correct answer: to enable the port to enter the forwarding state immediately when the host boots up, to protect the operation of the port from topology change processes.
Why this is the answer
Enabling PortFast on a switch port connected to an end host allows the port to transition immediately to the forwarding state, bypassing the normal Spanning Tree Protocol (STP) listening and learning states. This significantly speeds up host boot times and network access. Additionally, PortFast prevents the port from generating Topology Change Notifications (TCNs) when the end host connects or disconnects. TCNs can cause temporary network disruptions as switches flush their MAC address tables and re-learn entries. By suppressing TCNs on end-host ports, PortFast protects the network from unnecessary topology change processes, improving stability. PortFast does not block communication, prevent STP participation (it assumes a stable edge), or limit MAC addresses (that's port security).
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