CCNP R&S Question of the Week: BPDU Guard

April 3, 2015 Johnny Bass Cisco, Cloudera, Featured, Professional Development, Project Management, Routing & Switching, Technology, Training in Business

Why is a Bridge Protocol Data Unit (BPDU) guard an effective way to prevent a rogue switch from joining a network?

A. BPDU guard can guarantee proper selection of the root bridge.
B. BPDU guard can be utilized along with PortFast to shut down ports when a switch is connected to the port.
C. BPDU guard can be utilized to prevent the switch from transmitting BPDUs and incorrectly altering the root bridge election.
D. BPDU guard can be used to prevent invalid BPDUs from propagating throughout the network.

Reveal Answer

Answer: B.

BPDU guard will add a port into an error-disabled state if a Spanning Tree Bridge Protocol Data Unit is received. This will stop any switch from joining that may be possibly trying to take over the Spanning Tree topology.

Related Resources
Cisco White Papers

Related Course
CCNP Routing and Switching e-Camp

CCNP R&S Question of the Week Series

CCNP R&S Question of the Week: IPv6
CCNP R&S Question of the Week: BGP Attribute
CCNP R&S Question of the Week: Gateway of Last Resort
CCNP R&S Question of the Week: Routing Protocols into OSPF
CCNP R&S Question of the Week: BPDU Guard

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