1Z0-997-26 Practice Test 4 — 10 Questions

Question 1

When designing an enterprise-grade disaster recovery architecture on OCI, which THREE practices are recommended to ensure a successful failover and minimize operational risk during a disaster event? (Choose three.)

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Automate failover orchestration using tools like OCI Full Stack Disaster Recovery.. Best practices include regularly testing DR plans via drills, automating workflows with FSDR or runbooks, and ensuring identical resource capacity in the DR region.

Answer

Disable all health checks on load balancers to prevent false alarms during failover.

Answer

Rely solely on manual documentation stored on local laptops for failover steps.

Question 2

Which OCI networking component is required to securely connect a VCN in one OCI region to a VCN in another OCI region for cross-region Data Guard database replication?

Accepted Answer

Dynamic Routing Gateway (DRG) with Remote VCN Peering. Remote VCN peering using Dynamic Routing Gateways (DRGs) in both regions connects VCNs across regions.

Answer

Internet Gateway (IGW)

Answer

NAT Gateway

Answer

Local Peering Gateway (LPG)

Question 3

Which OCI service can be used to monitor the health and performance of your load balancers and backend compute instances across multiple availability domains, triggering alarms if health checks fail?

Accepted Answer

OCI Monitoring service with Alarm definitions. OCI Monitoring service collects metrics and logs from resources like Load Balancers and Compute instances, allowing you to create alarms based on metric thresholds.

Answer

OCI DNS Traffic Management

Answer

OCI Audit service

Answer

OCI Vault service

Question 4

Which THREE factors should an architect evaluate when determining Recovery Point Objective (RPO) and Recovery Time Objective (RTO) for an OCI database disaster recovery solution? (Choose three.)

Accepted Answer

Level of automation configured for failover (e.g., Fast-Start Failover vs. manual scripts). RPO and RTO are driven by business tolerance for data loss, network throughput/latency constraints for replication, and the degree of automation (like FSFO or FSDR) applied to failover procedures.

Answer

The color scheme and layout of the OCI Console dashboard

Answer

The default tenant tenancy OCID string length

Question 5

An architect is designing a multi-region disaster recovery architecture for an application running on OCI Compute. The database layer uses Oracle Data Guard. For the application tier, what is the recommended approach to handle stateless application servers in the DR region?

Accepted Answer

Pre-provision compute instances in a stopped state or use instance pools with standby configuration, activating them during a disaster event.. Stateless application servers in the DR region can be pre-provisioned in a stopped state or dynamically provisioned using instance pools and autoscaling, reducing costs while maintaining readiness.

Answer

Run all application servers at full capacity in both regions simultaneously with active write locks.

Answer

Store application binaries solely in Object Storage and compile them on the fly using user-data scripts during failover.

Answer

Rely entirely on manual creation of compute instances via the OCI console after an outage occurs.

Question 6

An enterprise application uses an Oracle Exadata Database Service on Dedicated Infrastructure with Maximum Availability Architecture (MAA). A catastrophic regional disaster occurs, and you must initiate a failover to the standby region. What is the expected behavior of Active Data Guard during this process?

Accepted Answer

The standby database converts to the primary role, opens for read/write operations, and stops applying redo from the old primary.. During a failover, the standby database is transitioned to become the primary role, opening for read/write traffic while breaking the replication relationship with the former primary.

Answer

The standby database automatically initiates a flashback database operation to sync with object storage backups before opening.

Answer

Active Data Guard remains in read-only mode until a manual database restore command is issued.

Answer

The database becomes inaccessible until Full Stack Disaster Recovery automatically reprovisions the storage cells.

Question 7

You are configuring a Data Guard association between two Oracle Base Database Systems in different OCI regions. The primary database encounters an unplanned outage, and you perform a manual failover. What action must you take afterward if you wish to restore the original architecture with the old primary as the new standby?

Accepted Answer

Recreate or reinstate the former primary database (using Flashback Database or backup restoration) to convert it into a valid standby.. After a failover, the old primary database is no longer in sync and cannot act as a standard standby without being reinstated or rebuilt (e.g., using Flashback Database or re-creating the standby).

Answer

Run a simple 'SWITCHOVER' command to reverse roles without any data synchronization checks.

Answer

Modify the listener.ora file manually via SSH and restart the clusterware.

Answer

Delete the standby database and provision a brand-new VCN in the primary region.

Question 8

You are managing an Oracle Base Database Service instance and need to configure Data Guard to provide disaster recovery in another OCI region. Which prerequisite must be met before creating the Data Guard association?

Accepted Answer

Establish network connectivity between the primary and standby VCNs using a DRG and remote VCN peering.. Cross-region Data Guard requires remote VCN peering via a Dynamic Routing Gateway (DRG) or local peering if regional, and proper security list/NSG rules allowing traffic on ports such as 1521.

Answer

Ensure the standby database has a larger shape than the primary database.

Answer

Manually install the Oracle Data Guard binaries on the standby database compute instance prior to association.

Answer

Convert the primary database to an Autonomous Database instance.

Question 9

Your organization has a strict Recovery Point Objective (RPO) of 5 minutes and Recovery Time Objective (RTO) of 15 minutes for a multi-tier application. The database tier uses Oracle Data Guard. During a test drill, you notice that redo transport lag spikes to 8 minutes. What is the most likely architectural bottleneck causing this issue?

Accepted Answer

Inadequate cross-region network bandwidth or high latency causing redo transport congestion.. Redo transport lag exceeding RPO is frequently caused by insufficient network bandwidth or high latency between regions, preventing synchronous or fast asynchronous redo shipping from keeping pace with transaction volume.

Answer

Exceeded OCI Block Volume IOPS limits on the standby database's local NVMe scratchpad.

Answer

Misconfigured OCI IAM policy allowing read-only access to database backups.

Answer

Incorrect OCI Load Balancer SSL certificate configuration on the web tier.

Question 10

An application deployed across two OCI regions uses a DNS-based traffic management steering policy. A database failure occurs in the primary region, and the application must failover to the secondary region. What is the primary limitation of relying solely on DNS Traffic Management for disaster recovery failover?

Accepted Answer

Client-side caching and DNS TTL expiration delays can cause continued traffic routing to the failed region.. DNS failover relies on TTL (Time to Live) values, which can cause clients to continue sending traffic to the failed primary region until the TTL expires, leading to a delay in RTO.

Answer

DNS steering policies cannot route traffic across different geographic regions.

Answer

DNS records are permanently immutable once created in OCI.

Answer

DNS routing requires public IP addresses to be configured on the database backends.