Building 3 access switches at 99% CPU — intermittent connectivity loss

A easy Network Engineering scenario on STP Loop.

Practice this scenario

Start a graded attempt against this scenario. Your response is scored by the same deterministic rubric used across the catalog. Email and evidence content stay hidden until you start.

Launches this exact scenario. One of 3 templates in this Track + Difficulty pool.

catalog id · network-stp-loop-bldg3

Training alignment

What this scenario practices, mapped to recognized frameworks.

Educational mapping only. Not a compliance attestation.

What this trains

Layer-2 loop diagnosis
Spanning-tree recovery discipline

MITRE ATT&CKmitre-attack

Not applicable to this scenario.Not applicable

MITRE D3FENDmitre-d3fend

Network Traffic AnalysisD3-NTA
PartialMedium confidence
Trains traffic-visibility reasoning while diagnosing the loop.

NIST CSF 2.0nist-csf-2

Anomalies and Events · DetectDE.AE · DE
MappedHigh confidence
Trains anomaly recognition on switching telemetry.
Protective Technology · ProtectPR.PT · PR
MappedHigh confidence
Trains the protective-technology baseline (STP / BPDU guard).

NIST SP 800-61r3nist-sp-800-61r3

IR lifecycle phaseDetection & Analysis
MappedHigh confidence
Trains structured triage of switching-fabric symptoms.
IR lifecycle phaseContainment, Eradication & Recovery
MappedHigh confidence
Trains loop containment and recovery workflow.

CISA Cybersecurity Performance Goalscisa-cpg

Document Network Topology2.M
MappedHigh confidence
Trains the topology-documentation baseline.
Document Device Configurations2.L
MappedHigh confidence
Trains the config-documentation baseline.

CIS Controls v8cis-controls

Network Infrastructure ManagementControl 12
MappedHigh confidence
Trains the network-management control the scenario centers on.