What is the effect of entering the spanning-tree portfast configuration command on a switch?
- It disables an unused port.
- It disables all trunk ports.
- It enables portfast on a specific switch interface.
- It checks the source L2 address in the Ethernet header against the sender L2 address in the ARP body.
Explanation: The spanning-tree portfast interface configuration command is used to enable PortFast on a specific switch port, which allows the interface to bypass the standard Spanning Tree Protocol (STP) listening and learning states to transition immediately from a blocking state to a forwarding state. This feature is specifically designed for ports connected to end devices to minimize the time they must wait for STP to converge, thereby preventing issues such as DHCP timeouts during the initial connection process.
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