After the dual-machine hot standby system software version upgrade is completed, which of the following items need to be verified? (Multiple choice)

Question

Options

• ASystem software version
• BFirewall active and standby status
• CDual-machine switching
• DSession table

• A
  24% (10)
• B
  76% (32)

Explanation

After a dual-machine hot standby upgrade, the primary concern is confirming that high-availability functions still work correctly, not just that the upgrade ran. Verifying the firewall active/standby status (B) ensures the upgrade didn't disrupt role assignment - an incorrect active/standby designation means your redundancy is invisible and broken. Dual-machine switching (C) must be tested because the entire point of a hot standby system is seamless failover; if switching is broken post-upgrade, you have a false sense of redundancy. The session table (D) must be checked to confirm that state synchronization between units is intact - without it, a failover causes existing connections to drop, defeating the purpose of a "hot" (stateful) standby.

Option A (System software version) is incorrect in this context because the version is already confirmed as a natural outcome of completing the upgrade - it's a precondition, not a post-upgrade verification step. The exam is asking what you validate about the HA system's operational health, not the upgrade artifact itself.

Memory tip: After any hot standby maintenance, think "SFS" - Status (who is active/standby?), Failover (does switching work?), Sessions (is state syncing?) - these three confirm the system is genuinely redundant, not just upgraded.

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