What occurs when PortFast is enabled on an interface that is connected to another switch?
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A. B. C. D.D
Enabling the PortFast feature causes a switch or a trunk port to enter the STP forwarding-state immediately or upon a linkup event, thus bypassing the listening and learning states.
Note: To enable portfast on a trunk port you need the trunk keyword spanning-tree portfast trunk
When PortFast is enabled on an interface that is connected to another switch, it can lead to network issues as it can potentially create a switching loop, which could cause broadcast storms and other problems.
PortFast is a Cisco feature that is used to accelerate the STP (Spanning Tree Protocol) process. STP is a protocol that helps prevent switching loops by blocking redundant paths in the network. When a switch is first connected to the network, it goes through a process called "listening" and "learning" before forwarding data. This process can take some time, and PortFast is designed to speed it up.
However, if PortFast is enabled on an interface that is connected to another switch, it can bypass the listening and learning process and cause the switch to start forwarding data immediately. This can create a switching loop if the switch on the other end of the connection is not also using PortFast.
The correct answer to the question is D. When PortFast is enabled on an interface that is connected to another switch, it can bypass the STP process, which increases the likelihood of a switching loop. This, in turn, can cause broadcast storms and other network issues. Therefore, it is important to be careful when using PortFast and to ensure that it is only enabled on interfaces that are not connected to other switches or devices.