High Availability & Redundancy Flashcards
7 cards from real ACA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 High Availability & Redundancy flashcards as text
What does 'Hitless Switchover' mean in the context of AudioCodes HA?
Answer: Active calls are preserved and continue without interruption after failover to the standby unit
Hitless switchover means that in-progress calls are maintained through the failover event, with media streams continuing on the standby unit.
What mechanism does the AudioCodes standby unit use to detect that the active unit has failed?
Answer: Keep-alive messages exchanged over the dedicated HA link
Keep-alive messages over the dedicated HA synchronization link allow the standby unit to detect active unit failure and initiate switchover.
In AudioCodes HA, what is a 'Manual Switchover' used for?
Answer: Forcing a failover during planned maintenance without waiting for a failure event
Manual switchover allows administrators to gracefully transfer the active role to the standby unit for maintenance, upgrades, or testing without an actual failure.
What is the recommended approach for upgrading firmware on an AudioCodes HA pair to minimize downtime?
Answer: Upgrade the standby unit first, perform a manual switchover, then upgrade the originally-active unit
Upgrading the standby first, then switching over, then upgrading the other unit allows rolling upgrades with minimal (or zero) service disruption.
Which AudioCodes HA state indicates the unit is fully synchronized and prepared to assume the active role?
Answer: Hot Standby
A unit in 'Hot Standby' state is fully synchronized with the active unit and can assume the active role immediately without any delay or data loss.
What happens to SIP registrations on endpoints when an AudioCodes HA failover occurs with hitless switchover enabled?
Answer: Registrations are preserved because the standby takes the virtual IP and retains the registration database
Because the standby assumes the virtual IP and has a synchronized registration database, existing SIP registrations are maintained without requiring re-registration.
In an AudioCodes HA pair, which unit is responsible for sending SNMP traps and syslog messages to the NMS during normal operation?
Answer: Only the active unit sends traps and logs; the standby suppresses these events
During normal operation, only the active unit generates SNMP traps and syslog messages; after failover, the newly active unit takes over this responsibility.