An application owner reports that their application is "down". An Operator checks the Avi dashboard and finds that the Health Score for the corresponding virtual service is 1. The Operator observes that all four components of the Health Score (Performance, Resource, Anomaly, Security) are extremely low. What are the possible root causes for such a catastrophic failure?
(Select all that apply.)

• A. The administrator's password for the Avi Controller UI has expired.
• B. A network outage has occurred between the Avi Controller and the Service Engines.
• C. The virtual service's VIP address has been misconfigured on the upstream router.
• D. The single Service Engine hosting the virtual service has crashed or lost power.
• E. All backend servers in the pool are powered off or have lost network connectivity.
• F. The "Log Successful Checks" option on the health monitor was disabled.

Which of the following is a direct benefit of Avi's distributed data plane architecture compared to traditional appliance-based load balancers?
Traditional ADC:
- Centralized, monolithic hardware appliance
- All traffic flows through a single point
- Scaling requires deploying a larger appliance
Avi Vantage:
- Distributed software Service Engines
- SEs are deployed near applications
- Scaling is achieved by deploying more SEs

• A. It ensures all backend servers must be in the same Layer 2 network.
• B. It simplifies the management of SSL/TLS certificates.
• C. It eliminates the need for a control plane.
• D. It provides elastic, on-demand scaling of load balancing capacity.

A DevOps Engineer is automating the renewal of an SSL/TLS certificate using the Avi REST API.
The existing certificate, cert-old, is expiring, and a new certificate, cert-new, has been created in the Avi Controller. The cert-old is currently attached to 50 different Virtual Services. What is the most efficient way to replace the old certificate with the new one for all 50 Virtual Services?

• A. Write a script that iterates through all 50 Virtual Services and patches each one to reference cert- new.
• B. Manually edit each of the 50 Virtual Services and change the SSL/TLS certificate from cert-old to cert-new.
• C. Use a single API call to the cert-old object, instructing it to be replaced by cert-new everywhere it is used.
• D. Delete cert-old, which will force all Virtual Services to automatically bind to cert-new.

In a Service Engine Group configured for N+M high availability, what is the state of the 'M' buffer Service Engines during normal operation?

• A. They are used exclusively for processing health monitor traffic to reduce the load on the active SEs.
• B. They are active and processing traffic alongside the 'N' primary Service Engines.
• C. They are powered on and running, but are kept idle (not hosting any virtual services), ready to take over in case of a failure.
• D. They are powered off and are powered on by the Avi Controller only when a failure occurs.

An e-commerce application requires that once a user adds an item to their shopping cart, all subsequent requests from that user during their session are sent to the same backend server.
Which Avi feature is designed to ensure this behavior?
# Application Requirement:
- User A connects and is sent to Server 1.
- User A adds an item to their cart.
- User A's next request must go to Server 1.
- User B connects and can be sent to any server.

• A. Load Balancing Algorithm
• B. Health Monitor
• C. Persistence Profile
• D. Alerting Profile