Which spanning-tree feature places a port immediately into a forwarding stated?
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A. B. C. D. E.B
PortFast causes a switch or trunk port to enter the spanning tree forwarding state immediately, bypassing the listening and learning states. You can use PortFast on switch or trunk ports that are connected to a single workstation, switch, or server to allow those devices to connect to the network immediately, instead of waiting for the port to transition from the listening and learning states to the forwarding state.
The correct answer to the question is B. PortFast.
Spanning Tree Protocol (STP) is a protocol used in network bridges and switches to prevent loops in a network. STP's main function is to ensure that only one active path exists between any two network switches or bridges. STP uses a set of algorithms to create a tree-like structure of network paths and selects the best path, while blocking redundant paths.
PortFast is a feature in Cisco switches that allows a port to immediately transition from blocking to forwarding state, bypassing the listening and learning states. PortFast is used to reduce the amount of time it takes for a host to gain access to the network after being connected to a switch port.
When a switch port is enabled with PortFast, it is assumed that the port is connected to an end device, such as a workstation or a server, and not to another switch or bridge. PortFast allows the port to immediately transition from blocking to forwarding state without waiting for the normal STP process to complete.
This feature is useful in scenarios where there is no risk of creating a network loop, such as connecting a workstation to a switch port. If a switch port enabled with PortFast receives a BPDU (Bridge Protocol Data Unit), which is a message sent between switches to exchange information about network topology, it will automatically be disabled, preventing the possibility of creating a network loop.
To summarize, PortFast is a feature that immediately places a port into the forwarding state, bypassing the STP algorithm. It is used to reduce the amount of time it takes for a host to gain access to the network after being connected to a switch port.