352-001 · Question #655
Which option describes a design benefit of Bridge Assurance?
The correct answer is C. It does notgeneratea spanning-tree topology change upon connecting and disconnecting a station. Bridge Assurance is deployed on network-facing ports and requires edge ports to be configured with PortFast, which suppresses Spanning Tree topology change notifications when stations connect or disconnect.
Question
Which option describes a design benefit of Bridge Assurance?
Options
- AIt allows small, unmanaged switches to be plugged into ports of access switches without the risk
- BIt makes the port go immediately into the forwarding state after being connected.
- CIt does notgeneratea spanning-tree topology change upon connecting and disconnecting a station
- DIt prevents switched traffic from traversing suboptimal paths on the network.
- EIt prevents switch loops by detecting one-way communications on the physicalport.
How the community answered
(59 responses)- B2% (1)
- C92% (54)
- D5% (3)
- E2% (1)
Why each option
Bridge Assurance is deployed on network-facing ports and requires edge ports to be configured with PortFast, which suppresses Spanning Tree topology change notifications when stations connect or disconnect.
Protecting the network from unmanaged switches plugged into access ports is the function of BPDU Guard, not Bridge Assurance.
Immediately transitioning a port to the forwarding state upon connection is the behavior of PortFast, not Bridge Assurance.
A design that properly deploys Bridge Assurance categorizes ports as either network ports (where Bridge Assurance continuously exchanges BPDUs) or edge ports (where PortFast is enabled). With PortFast active on edge ports, connecting or disconnecting a station does not generate a Spanning Tree Topology Change Notification (TCN), preventing unnecessary network-wide reconvergence events as a direct design benefit of this deployment model.
Preventing traffic from traversing suboptimal paths is a benefit of proper STP root bridge placement and path cost tuning, not Bridge Assurance.
Detecting one-way communications describes the underlying mechanism of Bridge Assurance, not a design benefit as the question specifically asks.
Concept tested: Bridge Assurance deployment and topology change suppression
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/lanswitch/configuration/xe-16/lanswitch-xe-16-book/lsw-span-tree-prot.html
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