Change control, patching, backups and decommissioning

3 quick checks≈3% of the testFoundational

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Explain the purpose and stages of change control, including request, impact assessment, approval, maintenance scheduling, implementation, validation, documentation and rollback.
Apply patch and firmware management practices for network devices, including testing, compatibility checking, staged deployment, verification and risk reduction.

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Verify backup integrity and restoration readiness through validation, retention practices and periodic recovery testing.

Perform secure decommissioning tasks for network hardware and virtual resources, including data sanitization, certificate and key removal, license recovery, asset updates and disposal according to policy.

Explain the operational importance of version control, configuration archives and post-change documentation updates after maintenance activities.

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