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Exam 300-115 topic 4 question 108 discussion

Actual exam question from Cisco's 300-115
Question #: 108
Topic #: 4
[All 300-115 Questions]

What is the effect of configuring the following command on a switch?
Switch(config) # spanning-tree portfast bpdufilter default

  • A. If BPDUs are received by a port configured for PortFast, then PortFast is disabled and the BPDUs are processed normally.
  • B. If BPDUs are received by a port configured for PortFast, they are ignored and none are sent.
  • C. If BPDUs are received by a port configured for PortFast, the port transitions to the forwarding state.
  • D. The command enables BPDU filtering on all ports regardless of whether they are configured for BPDU filtering at the interface level.
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Suggested Answer: A 🗳️
by tpike at Feb. 13, 2020, 11:31 p.m.

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tpike
5 years, 2 months ago
A "At the global level, you can enable BPDU filtering on Port Fast-enabled interfaces by using the spanning-tree portfast bpdufilter default global configuration command. This command prevents interfaces that are in a Port Fast-operational state from sending or receiving BPDUs. The interfaces still send a few BPDUs at link-up before the switch begins to filter outbound BPDUs. You should globally enable BPDU filtering on a switch so that hosts connected to these interfaces do not receive BPDUs. If a BPDU is received on a Port Fast-enabled interface, the interface loses its Port Fast-operational status, and BPDU filtering is disabled." https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3560/software/release/12-2_55_se/configuration/guide/3560_scg/swstpopt.html
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