A10 Certified Professional System Administration 4 Free Sample Questions

According to the ACOS 2.7x to 4.x Migration Guide, legacy HA parameters for Real Servers, which includes ha-priority-cost, are not supported by the automated migration script. These configurations are considered exceptions and must be removed or manually reconfigured using VRRP-A's tracking options before the vrrp-a ha-migration command can succeed.

ACOS 4.x enhances SNMP to be partition-aware. This allows administrators to configure SNMP settings, including community strings, independently within each L3V partition. This is essential for multi-tenant environments where monitoring credentials and configurations must be isolated.

The best practice for a controlled, graceful failover in a VRRP-A setup is to manipulate the VRID priorities. By increasing the priority of the standby device (ACOS2) to be higher than the active device (ACOS1), you trigger a standard VRRP-A election process, causing a failover with minimal disruption. Rebooting is disruptive, and a vmaster-take-over affects the control plane (vMaster role) which is distinct from the data plane traffic flow managed by VRRP-A.

A 403 Forbidden error indicates that the server understood the request but refuses to authorize it. This is a permissions issue, not an authentication issue (which would be a 401 Unauthorized). ACOS maintains separate privilege sets for different management interfaces. It is possible for a role to have write access in the GUI and CLI but be denied access to the corresponding aXAPI endpoints. The administrator needs to verify the RBAC configuration for aXAPI access.

This is false. If a vBlade loses connectivity to the vMaster, it enters a standalone state. It will continue to process traffic based on its last known configuration but will cease to receive updates from the vMaster. It does not automatically reboot. An administrator must intervene to troubleshoot the connectivity issue and manually reintegrate the vBlade into the aVCS cluster.

According to the ACOS 4.x documentation, a key change in default behavior is that the WAF 'sql-check' feature, which previously checked cookies for malicious SQL keywords, no longer does so in release 4.1.4 and later. This change was made to reduce false positives and improve performance.