Before upgrading the dual-machine system software version, which of the following tasks need to be prepared? (Multiple choice)

Question

Options

• ADual-machine switching situation
• BConfirm the current business operation status and record it, such as MAC table, session table,
• CBack up important data, such as current configuration files and system software
• DConfirm the operating status of the device and record it, such as the current version of software,

• A
  100% (37)

Explanation

All four options are correct because upgrading dual-machine (active/standby) systems carries significant risk - a failed upgrade can cause service outages - so thorough pre-upgrade documentation and verification are essential for both safety and rollback capability.

Why each option is required:

• A - Knowing the current dual-machine switchover status (which node is active, which is standby) ensures you upgrade the standby node first and don't accidentally disrupt the active traffic path.
• B - Recording live state like MAC address tables and session tables gives you a baseline to verify service continuity after the upgrade and helps diagnose regressions.
• C - Backing up configuration files and system software is your insurance policy; if the upgrade fails or introduces bugs, you can restore the device to a known-good state.
• D - Documenting the current software version and device health confirms you're starting from a supported upgrade path and provides a reference point for troubleshooting.

Since all four choices are correct, there are no wrong distractors in this question.

Memory tip: Use the acronym S-S-B-V - Switchover status, State/sessions, Backup configs, Version/device health - to recall the four pre-upgrade checkboxes for any dual-machine upgrade scenario.

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