200-301: Cisco Certified Network AssociateDemo

Question

What are two reasons to configure PortFast on a switch port that is connected to an end host?

Choose two

A to block another switch or host from communicating through the port
B to enable the port to enter the forwarding state immediately when the host boots up
C to prevent the port from participating in Spanning Tree Protocol operations
D to protect the operation of the port from topology change processes
E to limit the number of MAC addresses learned on the port to 1

Explanation

PortFast is designed for edge/access ports connected to end devices so the interface can move to the forwarding state immediately instead of waiting through the normal Spanning Tree listening and learning states. This allows the host to obtain connectivity as soon as it boots or the link comes up. It is also used on end-host ports because those ports are treated as edge ports, reducing the effect of normal host link-up or link-down events on spanning-tree topology change behavior. PortFast does not disable STP on the port, block communication, or limit MAC learning.

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Understand Spanning Tree PortFast and BPDU Guard

200-301: Cisco Certified Network AssociateDemo

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Notes

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