200-301: Cisco Certified Network AssociateDemo

By Cisco · Question Mode

QuestionQ439

Network Access

What are two characteristics of PortFast?

Choose two
  • A Convergence is fast after a link failure.
  • B STP loops are mitigated for uplinks to other switches.
  • C Ports transition directly from the blocking state to the forwarding state.
  • D Ports operate normally without receiving BPDUs.
  • E Ports that connect to the backbone automatically detect indirect link failures.
Explanation

PortFast is an STP edge-port feature for interfaces connected to end hosts. It causes the port to transition immediately from the blocking state to the forwarding state, bypassing the usual listening and learning states. In a valid PortFast configuration, the port is expected to operate as an edge port and not receive BPDUs; receipt of BPDUs indicates the port is not connected only to an end device and should not be treated as PortFast without additional protections such as BPDU Guard.

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