Oracle 1z0-1124-25 Oracle Cloud Infrastructure 2025 Networking Professional Exam Practice Test

Goal:Minimize downtime in blue/green deployment with ALB.

ALB Capabilities:Supports weighted routing for gradual traffic shifts.

Evaluate Options:

A:Immediate switch risks downtime if ‘green’ fails; less efficient.

B:Listener swap causes abrupt change; not optimal.

C:Gradual shift with weights ensures smooth transition; most efficient.

D:Forcing ‘blue’ unhealthy is disruptive and hacky; inefficient.

Conclusion:Weighted routing provides the smoothest transition.

ALB supports blue/green via routing rules. The Oracle Networking Professional study guide states, "Application Load Balancer’s routing rules allow weighted traffic distribution between backend sets, enabling blue/green deployments with minimal downtime" (OCI Networking Documentation,Section: Load Balancer Routing). This method ensures stability during updates.

Problem:Private subnet instances can’t access Object Storage via Service Gateway.

Setup Check:Route rules point to Service Gateway; NSGs allow traffic.

Evaluate Causes:

A:Incorrect CIDR labels block Object Storage access; likely.

B:Internet Gateway irrelevant for Service Gateway; incorrect.

C:NSGs confirmed open, security lists secondary; less likely.

D:NAT Gateway not used here; incorrect.

Conclusion:Misconfigured Service Gateway CIDR is the most likely issue.

Service Gateway requires specific CIDR labels. The Oracle Networking Professional study guide states, "For private subnets to access Object Storage via a Service Gateway, the gateway must be configured with the correct regional Oracle Services CIDR label" (OCI Networking Documentation, Section: Service Gateway Configuration). Misconfiguration prevents access despite proper routing.

Context: Zero Trust assumes no trust, requiring strict isolation (micro-segmentation).

Option A: Bandwidth isn’t increased by segmentation—incorrect.

Option B: Segmentation may increase route tables for granularity, not reduce them—incorrect.

Option C: Micro-segmentation isolates workloads, limiting breach impact (blast radius)—core Zero Trust goal and correct.

Option D: Inter-region connectivity isn’t simplified by micro-segmentation—incorrect.

Conclusion: Option C aligns with Zero Trust principles.

Oracle notes:

"Micro-segmentation in OCI VCNs, using NSGs and security lists, limits the blast radius of breaches by isolating resources, a key Zero Trust principle."This supports Option C. Reference:Zero Trust in OCI - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Concepts/zerotrust.htm).

Objective: Securely transition from self-signed to trusted CA certificates.

Option A: Importing self-signed certificates into OCI Certificates doesn’t improve security—incorrect.

Option B: Immediate replacement risks outages if clients don’t trust the new CA—unrecommended.

Option C: Gradual replacement with OCI Certificates, updating client truststores, ensures security and minimizes disruption—correct.

Option D: Bypassing validation via WAF weakens security—incorrect.

Conclusion: Option C is the most secure and recommended method.

Oracle advises:

"Replace self-signed certificates with OCI Certificates from a trusted CA. Perform a phased rollout and update client truststores to avoid disruptions."This validates Option C. Reference:OCI Certificates Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Security/Certificates/overview.htm).

Goal: Verify routing for inter-region VCN peering via DRG.

Option A: Cloud Guard monitors security, not routing—incorrect.

Option B: Audit Logs track changes, not current routing state—incorrect.

Option C: DRG Route Tables define routing rules, directly showing misconfigurations—correct.

Option D: Network Visualizer shows topology but not detailed routing rules—less effective.

Conclusion: DRG Route Tables are most effective.

Oracle states:

"DRG Route Tables are the primary tool for verifying and troubleshooting routing configurations for inter-region VCN peering."This validates Option C. Reference:DRG Troubleshooting - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/managingDRGs.htm#troubleshooting).

Goal:Stable endpoint for MySQL DB with HA failover support.

Endpoint Options:

Public IP:Exposed, changes on failover; unsuitable.

DNS with Floating IP:Persistent across failovers; ideal.

Private IP:Tied to primary, fails on switch; incorrect.

Service Gateway:For OCI services, not MySQL DB; incorrect.

Evaluate Options:

A:Public exposure, no HA; incorrect.

B:Floating private IP with DNS ensures continuity; correct.

C:Static IP breaks on failover; incorrect.

D:Misaligned purpose; incorrect.

Conclusion:DNS with floating IP is most suitable.

MySQL DB in OCI uses floating IPs for HA. The Oracle Networking Professional study guide explains, "A DNS hostname resolving to the floating private IP of the active MySQL Database Service instance ensures seamless connectivity during failover events" (OCI Networking Documentation, Section: MySQL Database Service HA). This provides predictability and stability.

Goal:Prefer FastConnect routes over public internet in OCI.

BGP Attributes:

Local Preference:Higher value prefers a path within an AS.

AS Path:Shorter path preferred, but manipulated on sender side.

Prefix Length:More specific wins, but not controllable here.

MED:Influences inbound traffic, not OCI preference.

Evaluate Options:

A:Higher Local Preference ensures FastConnect priority; correct.

B:AS Path is set by on-premises, not OCI; incorrect.

C:Prefix specificity is on-premises controlled; incorrect.

D:MED affects on-premises, not OCI; incorrect.

Conclusion:Local Preference is the right attribute.

Local Preference controls route preference in BGP. The Oracle Networking Professional study guide states, "To prioritize FastConnect routes in OCI, increase the Local Preference for routes learned via the FastConnect virtual circuit over other paths" (OCI Networking Documentation, Section: BGP Configuration). This ensures OCI prefers the private path.

Goal: Force spoke-to-spoke traffic via a network appliance in hub-and-spoke topology.

Option A: Static routes on DRG to appliance ensure transitive routing—correct.

Option B: Service Gateway is for OCI services—incorrect.

Option C: Internet Gateway is public, not hub-and-spoke—incorrect.

Option D: LPG bypasses the appliance—incorrect.

Conclusion: Option A is necessary.

Oracle notes:

"In a hub-and-spoke topology, configure DRG route tables with static routes to the network appliance’s private IP for transitive routing between spokes."This supports Option A. Reference:Hub-and-Spoke Topology - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/hubspoke.htm).

Requirements:VCN isolation, inter-VCN traffic via on-premises appliances.

DRG Role:Central hub for VCN and FastConnect connectivity.

Evaluate Options:

A:DRG routes inter-VCN traffic via FastConnect to on-premises; meets isolation and inspection needs.

B:Transit Routing allows direct VCN-to-VCN communication, bypassing on-premises; incorrect.

C:Bypassing DRG with VPNs is complex and unsupported; incorrect.

D:LPG is for intra-region peering, not DRG-to-FastConnect; incorrect.

Conclusion:Option A enforces the policy via DRG route tables.

DRG route tables control traffic flow. The Oracle Networking Professional study guide states, "To force inter-VCN traffic through an on-premises network via FastConnect, configure DRG route tables to route VCN-destined traffic to the FastConnect attachment, ensuring isolation and inspection" (OCI Networking Documentation, Section: DRG Routing). This setup leverages a single DRG effectively.

Objective: Identify a VPN disadvantage for large dataset migration.

Option A: VPNs can be secure with IPSec; not inherently less secure—incorrect.

Option B: VPNs are automatable with IaC (e.g., Terraform)—incorrect.

Option C: Public internet limits VPN throughput due to bandwidth and latency variability—correct disadvantage.

Option D: VPNs are compatible with OCI services—incorrect.

Conclusion: Option C is the key disadvantage.

Oracle notes:

"Public internet-based VPNs face throughput limitations due to bandwidth and latency variability, impacting large data migrations.”This supports Option C. Reference:VPN Limitations - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/settingupIPSec.htm#limitations).

Objective: Improve OCI-AWS data transfer performance.

Option A: Region distance affects latency—valid.

Option B: Dedicated interconnect boosts bandwidth and stability—valid.

Option C: Compute pricing doesn’t influence inter-cloud bandwidth—invalid.

Option D: WAN optimization can enhance transfer efficiency—valid.

Conclusion: Option C is not a design consideration for performance.

Oracle notes:

"To optimize OCI-AWS connectivity, consider region proximity, dedicated interconnects, or WAN optimization. Compute pricing is unrelated to network performance."This excludes Option C. Reference:Hybrid Cloud Networking - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Concepts/hybridcloud.htm).

Objective:Enable DNSSEC to secure OCI DNS against spoofing.

DNSSEC Process:Requires enabling on the zone, generating keys, and updating the registrar.

Evaluate Options:

A:Steering policies manage traffic, not DNSSEC; incorrect.

B:OCI DNS auto-generates keys; manual upload unnecessary; incorrect.

C:Enabling DNSSEC starts the process, provides DS record; correct first step.

D:Resolver validation is client-side, not enabling DNSSEC; incorrect.

Conclusion:Enabling DNSSEC on the zone is the critical first step.

DNSSEC setup begins at the zone level. The Oracle Networking Professional study guide states, "The first step to enable DNSSEC in OCI DNS is to activate it on the zone, which generates keys and provides a DS record to share with your registrar" (OCI Networking Documentation, Section: DNSSEC Configuration). This establishes the chain of trust.

Context: Inter-tenancy VCN peering connects VCNs across different OCI tenancies using Remote Peering Connections (RPCs).

Option A: Authentication of the root user is handled by IAM policies, not the peer ID, which is a technical identifier—incorrect.

Option B: The peer ID is the OCID of the RPC created by the requesting tenancy. It uniquely identifies the RPC, allowing the accepting tenancy to target and establish the peering—correct.

Option C: CIDR blocks are part of VCN configuration and shared separately, not via thepeer ID—incorrect.

Option D: Security rules are defined by NSGs or security lists, not the peer ID—incorrect.

Conclusion: The peer ID’s purpose is to identify the requesting tenancy’s RPC, making Option B the correct answer.

From Oracle’s documentation:

"For inter-tenancy peering, the requesting tenancy provides the OCID of its Remote Peering Connection (RPC), known as the peer ID, to the accepting tenancy. The accepting tenancy uses this ID to establish the peering."This confirms Option B. Reference:Remote VCN Peering Across Tenancies - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/remoteVCNpeering.htm#cross-tenancy).

Requirement: Low-latency, direct access to an on-premises SQL Server via FastConnect.

Option A: Internet Gateway with a public endpoint exposes the SQL Server to the internet, increasing latency and security risks—incorrect.

Option B: Service Gateway is for OCI services (e.g., Object Storage), not on-premises resources—incorrect.

Option C: FastConnect with a DRG provides a private, low-latency link. No additional OCI endpoint is needed; the SQL Server’s private IP is accessed directly via DRG routing—correct.

Option D: Private Endpoints are for OCI services within the VCN (e.g., ADB), not on-premises resources—incorrect.

Conclusion: Option C leverages FastConnect and DRG for direct, secure access.

Oracle documentation notes:

"FastConnect with a DRG enables private, low-latency connectivity to on-premises networks. Configure route tables to access on-premises resources directly; no additional endpoints are required."This supports Option C. Reference:FastConnect Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/fastconnect.htm).

Requirements:Low latency, high bandwidth, multi-region VCNs via one FastConnect, minimal cost/overhead.

DRG Strategy:

Multiple DRGs:Increases cost and complexity.

Single DRG:Centralizes management, reduces FastConnect attachments.

Evaluate Options:

A:Multiple DRGs and FastConnects; costly and complex; incorrect.

B:Remote peering connections imply RPC, not standard DRG attachments; less precise.

C:Single DRG with remote peering attachments; efficient and correct terminology; optimal.

D:LPGs are intra-region, not cross-region; incorrect.

Conclusion:Single DRG with remote peering attachments is most efficient.

A single DRG optimizes multi-region setups. The Oracle Networking Professional study guide notes, "For connecting multiple VCNs across regions to a single FastConnect, use one DRG with remote peering attachments to minimize cost and management overhead" (OCI Networking Documentation, Section: DRG with FastConnect). Option C aligns with OCI’s recommended architecture.

Requirements: Centralized DRG with tenant isolation.

Option A: Separate DRGs complicate management—incorrect.

Option B: NSGs work but are less secure than routing isolation—less optimal.

Option C: Single DRG with per-VCN route tables restricting routes to FastConnect only ensures isolation at the routing level—correct.

Option D: Compartments don’t isolate traffic at DRG—incorrect.

Conclusion: Option C is the most effective.

Oracle states:

"Use separate DRG route tables per VCN attachment to isolate traffic. Include only FastConnect routes to prevent VCN-to-VCN communication."This supports Option C. Reference:DRG Route Tables - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/managingDRGs.htm).

Problem: Instances with IPv6-only traffic can’t ping external IPv6 addresses despite FastConnect and IPv6 prefixes.

Option A: OCI supports Bring Your Own IP (BYOIP) for IPv6, including global unicast addresses, so this is incorrect.

Option B: NAT Gateways are for IPv4 outbound traffic, not IPv6—irrelevant here.

Option C: For IPv6-only instances to reach external IPv6 addresses (beyond FastConnect),an Internet Gateway (IGW) is required with a default route (::/0) in the subnet route table. This enables public IPv6 connectivity—correct.

Option D: Service Gateway is for OCI services, not general IPv6 internet access—incorrect.

Conclusion: Option C fixes the issue by enabling IPv6 internet access.

Oracle states:

"To enable IPv6 traffic to the internet, attach an Internet Gateway to the VCN and add a route rule for ::/0. OCI supports BYOIP for public IPv6 prefixes."This aligns with Option C. Reference:IPv6 in OCI - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/managingIPv6.htm).

Objective: Identify the OCI component for dynamic routing in a hybrid setup.

Option A: Internet Gateway enables public internet access, not private hybrid routing—incorrect.

Option B: DRG is a virtual router that dynamically routes traffic between on-premises networks and VCNs via FastConnect or VPN, using protocols like BGP—correct.

Option C: Service Gateway provides private access to OCI services, not on-premises connectivity—incorrect.

Option D: LPG peers VCNs within the same region, not with on-premises—incorrect.

Conclusion: DRG is essential for hybrid dynamic routing.

Oracle documentation confirms:

"The Dynamic Routing Gateway (DRG) enables dynamic routing between your on-premises network and VCNs, supporting hybrid cloud connectivity via FastConnect or VPN."This validates Option B. Reference:Dynamic Routing Gateway Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/managingDRGs.htm).

Goal:Prioritize application traffic over FastConnect for consistent performance.

Features:

VLAN Tagging:Segments traffic, no prioritization.

QoS:Prioritizes traffic based on rules.

BGP Communities:Route policy, not QoS.

Jumbo Frames:Increases MTU, not priority.

Evaluate Options:

A:No prioritization; incorrect.

B:QoS ensures priority; correct.

C:Routing control, not QoS; incorrect.

D:Throughput, not latency control; incorrect.

Conclusion:QoS is the right feature.

FastConnect QoS manages traffic priority. The Oracle Networking Professional study guide explains, "FastConnect Quality of Service (QoS) allows you to prioritize critical traffic over the circuit, ensuring consistent performance despite competing traffic" (OCI Networking Documentation, Section: FastConnect Features). This addresses latency variability effectively.

Identify the Goal: Troubleshoot efficiently to determine if stateful inspection is causing intermittent connectivity issues.

Option A Evaluation: Disabling stateful inspection globally removes all security checks, potentially restoring connectivity but disrupting the entire VCN’s security. This is inefficient and risky.

Option B Evaluation: Creating a bypass rule for the application server avoids inspection, which could confirm the issue but weakens security for that server. It’s a workaround, not a diagnostic step, and requires policy changes during troubleshooting.

Option C Evaluation: Reviewing firewall logs for denied traffic is targeted and non-disruptive. Logs show if stateful inspection is dropping packets (e.g., due to session timeouts or rule mismatches), directly identifying the cause without altering configurations.

Option D Evaluation: Recreating the firewall is highly disruptive, time-consuming, and doesn’t guarantee insight into the current issue. It’s not a troubleshooting step.

Conclusion: Option C is the most efficient, as it leverages logs for precise diagnosis without impacting operations.

Per Oracle’s Network Firewall documentation:

"Network Firewall logs provide detailed information about allowed and denied traffic, including source/destination IPs, ports, and protocols. Use logs to troubleshoot connectivity issues by identifying dropped packets due to stateful inspection or rule mismatches."

"Stateful inspection tracks connection states; misconfigurations can lead to dropped sessions."This confirms logs are the best tool for diagnosing stateful inspection issues. Reference:Network Firewall Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/NetworkFirewall/overview.htm).

Requirement:Centralized logging of Network Firewall traffic for analysis.

OCI Services:

Audit Service:Logs API calls, not network traffic.

Logging Analytics:Analyzes logs but needs log ingestion.

Service Connector Hub with Logging:Moves firewall logs to OCI Logging.

Cloud Guard:Monitors security posture, not detailed logging.

Evaluate Options:

A:Audit Service is for API events; incorrect.

B:Logging Analytics requires log source; incomplete.

C:Service Connector Hub with Logging captures and stores firewall logs; best fit.

D:Cloud Guard is for threat detection, not logging; incorrect.

Conclusion:Service Connector Hub with OCI Logging meets the requirement.

OCI Network Firewall logs require integration with OCI Logging. The Oracle Networking Professional study guide states, "Service Connector Hub can be configured to transfer Network Firewall logs to OCI Logging for centralized storage and analysis, meeting auditing requirements" (OCI Networking Documentation, Section: Network Firewall Logging). This ensures every session is logged and auditable.

Objective: Identify the true statement about KSK rotation in OCI DNS.

Option A: OCI DNS automates much of the process but requires user initiation, not fully automated—incorrect.

Option B: OCI DNS generates keys internally; manual generation and upload aren’t required—incorrect.

Option C: OCI DNS offers a “KSK Rollover” feature that, once enabled, automates the rotation process, ensuring minimal disruption—correct.

Option D: KSK rotation is supported via the rollover feature—incorrect.

Conclusion: Option C accurately describes OCI DNS KSK rotation.

Oracle documentation confirms:

"OCI DNS supports KSK rotation through the KSK Rollover feature. Enable it to automatically rotate keys while maintaining DNS resolution continuity."This validates Option C. Reference:DNSSEC in OCI DNS - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/DNS/Tasks/managingdnssec.htm).

Objective: Identify the essential Service Connector Hub task for routing Flow Logs to Object Storage.

Option A (Ingest Logs): Ingesting is for bringing external logs into OCI, but Flow Logs are already OCI-native—incorrect.

Option B (Process Logs): “Process Logs” isn’t a specific task type in Service Connector Hub—incorrect.

Option C (Deliver Logs): Deliver Logs moves logs to a target (e.g., Object Storage), ensuring storage—correct and essential.

Option D (Transform Logs): Transforming modifies logs optionally, but delivery is required for storage—incorrect as the primary task.

Conclusion: Deliver Logs is the essential task type for this scenario.

Oracle documentation states:

"The Deliver Logs task in Service Connector Hub moves logs, such as VCN Flow Logs, to a specified destination like Object Storage for storage and analysis."This supports Option C. Reference:Service Connector Hub Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/ServiceConnectorHub/Concepts/serviceconnectorhub.htm).

Goal:Minimize maintenance of Bastion session configurations.

Bastion Options:

Individual Sessions:High maintenance per instance.

Dynamic Port Forwarding:Flexible but user-managed, prone to errors.

Centralized Service:Predefined targets, low maintenance.

Separate Hosts:Increases complexity and overhead.

Evaluate Options:

A:Per-instance sessions require constant updates; inefficient.

B:SOCKS5 shifts burden to users; moderate maintenance.

C:Centralized with managed sessions reduces effort; optimal.

D:Multiple hosts multiply management tasks; worst option.

Conclusion:Centralized Bastion with managed sessions is most efficient.

OCI Bastion service supports centralized management. The Oracle Networking Professional study guide notes, "A centralized Bastion service with managed sessions and predefined target configurations minimizes administrative overhead by streamlining access to private subnet resources" (OCI Networking Documentation, Section: Bastion Service). This approach leverages OCI’s automation capabilities.

Requirements:Dedicated, high-bandwidth, low-latency, no Oracle FastConnect location, third-party provider.

FastConnect Models:

Direct Cross-Connect:Requires Oracle location; unsuitable.

Partner:Uses third-party network to Oracle; fits scenario.

Hosted:Third-party hosts, less common term; less precise.

Public Peering:Internet-based; doesn’t meet dedicated need.

Evaluate Options:

A:Needs Oracle presence; incorrect.

B:Third-party to Oracle; correct.

C:Similar but less standard term; less optimal.

D:Public internet; incorrect.

Conclusion:FastConnect Partner is most suitable.

Partner model extends FastConnect reach. The Oracle Networking Professional study guide states, "FastConnect Partner model leverages third-party providers to connect on-premises networks to OCI in regions without direct Oracle FastConnect locations" (OCI Networking Documentation, Section: FastConnect Models). This ensures dedicated connectivity.

Requirement:Private, secure access to OIC from a private subnet.

Endpoint Types:

Public:Internet-based; violates policy.

Service Gateway:For OCI services like Object Storage, not OIC.

Private:VCN-internal access to services; fits OIC.

Regional:Ambiguous, not specific; incorrect.

Evaluate Options:

A:Public internet; incorrect.

B:Wrong service target; incorrect.

C:Private within VCN; correct.

D:Undefined scope; incorrect.

Conclusion:Private Endpoint ensures secure connectivity.

Private Endpoints secure OIC access. The Oracle Networking Professional study guide notes, "A Private Endpoint allows applications in a private subnet to access Oracle Integration Cloud (OIC) within the OCI network, avoiding public internet exposure" (OCI Networking Documentation, Section: Private Endpoints). This meets the security policy directly.

Requirement Analysis:The solution must ensure private access to Object Storage without public internet traversal, while being cost-effective.

Evaluate OCI Components:

Internet Gateway:Provides public internet access, unsuitable for private connectivity.

NAT Gateway:Allows outbound internet access from private subnets, but traffic still exits OCI.

Service Gateway:Enables private access to OCI services like Object Storage within the same region.

DRG with FastConnect:Used for on-premises connectivity, not intra-OCI service access.

Option Assessment:

A:Uses public internet, violating the security policy.

B:HTTPS encrypts data, but traffic traverses the internet via NAT, violating the policy.

C:Service Gateway keeps traffic within OCI’s private network, meeting security and cost goals.

D:Overly complex and costly, with public endpoints contradicting the requirement.

Conclusion:Service Gateway with regional Object Storage endpoints ensures private, secure, and cost-effective access.

The Service Gateway is designed for private access to OCI services like Object Storage, avoiding the public internet. The Oracle Networking Professional study guide states, "A Service Gateway allows instances in a private subnet to access supported OCI services without an Internet Gateway or NAT Gateway, ensuring traffic remains within the Oracle network" (OCI Networking Documentation, Section: Service Gateway). Using the Oracle Services Network service CIDR label for the region ensures compatibility with Object Storage endpoints, optimizing cost and security.

Goal: Restrict subnet traffic to a specific on-premises IP range via FastConnect.

Option A: Internet Gateway is for public access, not FastConnect—incorrect.

Option B: Default security list applies broadly, lacking granularity; NSGs are more effective—less optimal.

Option C: Custom route table with DRG ensures FastConnect routing; NSGs provide precise, instance-level traffic restriction—correct.

Option D: LPG is for same-region VCN peering, not on-premises—incorrect.

Conclusion: Option C is the most effective method.

Oracle notes:

"Use a custom route table with a DRG route rule for FastConnect traffic. NSGs offer granular control to restrict traffic to specific IP ranges."This supports Option C. Reference:FastConnect and NSG Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/fastconnect.htm & docs.oracle.com/en-us/iaas/Content/Network/Concepts/NSGs.htm).

Requirements:Private subnet, no internet, access to other VCN subnets, HA database.

Analyze Components:

Public Subnet:Internet-exposed, against policy.

Private Subnet:No internet, aligns with policy.

Service Gateway:For OCI services, not ADB connectivity.

DRG:For inter-VCN routing.

NSGs:Granular traffic control.

Evaluate Options:

A:Public subnet violates no-internet policy; incorrect.

B:Service Gateway for Object Storage/Yum irrelevant to ADB; incomplete.

C:Private subnet, NSGs, DRG, and CIDR planning meet all needs; correct.

D:Public subnet with internet access; violates policy.

Conclusion:Option C is the most effective approach.

Autonomous Database requires private deployment for security. The Oracle Networking Professional study guide notes, "For Autonomous Database on Dedicated Exadata, use a private subnet with NSGs for access control and a DRG for inter-VCN connectivity, reserving CIDR for scalability" (OCI Networking Documentation, Section: Autonomous Database Networking). Service Gateway isn’t used for ADB access, but the private setup ensures compliance.

Objective: Identify essential info for CPE to establish a Site-to-Site VPN with OCI.

Option A: Region and availability domain are for OCI resource placement, not CPE config—incorrect.

Option B: The DRG’s public IP is the VPN endpoint, and the IKE pre-shared key authenticates the tunnel—essential and correct.

Option C: OCID and compartment ID are for OCI management, not CPE setup—incorrect.

Option D: Subnet CIDRs are for routing, configured later, not for tunnel establishment—incorrect.

Conclusion: Option B provides the critical VPN connection details.

Oracle documentation states:

"To configure your CPE for Site-to-Site VPN, you need the public IP address of the DRG (VPN headend) and the IKE pre-shared key from the OCI console."This confirms Option B. Reference:Setting Up IPSec VPN - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/settingupIPSec.htm).

Goal: Private, secure, least-privilege access to Object Storage across subnets.

Option A: Internet Gateway uses public access, violating privacy—incorrect.

Option B: NAT Gateway is for internet, not OCI services—incorrect.

Option C: Service Gateway provides private access; IAM policies enforce least privilege; route tables manage traffic—correct.

Option D: Private Endpoints per bucket/subnet are inefficient and unscalable—incorrect.

Conclusion: Option C is efficient and secure.

Oracle states:

"A Service Gateway enables private access to Object Storage. Use IAM policies for least-privilege access and route tables for traffic control."This supports Option C. Reference:Service Gateway Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/servicegateway.htm).

Goal: Layer 7 routing for OKE microservices via a single entry point.

Option A: Manual configuration is inefficient and doesn’t support path-based routing—incorrect.

Option B: LoadBalancer service provisions a Layer 4 balancer, not Layer 7 path routing—incorrect.

Option C: NodePort with NLB is Layer 4, less secure, and lacks path routing—incorrect.

Option D: Ingress controller with Regional Load Balancer (Application LB) provides Layer 7 routing based on paths—correct and efficient.

Conclusion: Option D is the best integration method.

Oracle states:

"Use a Kubernetes Ingress controller with OCI Regional Load Balancer for Layer 7 routing to OKE microservices based on request paths."This supports Option D. Reference:OKE Networking - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/ContEng/Tasks/contengnetworking.htm).

Requirements: HA and redundancy for on-premises-to-OCI connectivity.

Option A: Single FastConnect lacks redundancy—incorrect.

Option B: Single VPN over internet has no redundancy and poor performance—incorrect.

Option C: Dual FastConnect with diverse paths ensures HA and redundancy via separate routes—correct.

Option D: Internet Gateway with public IPs isn’t dedicated or redundant—incorrect.

Conclusion: Option C is the recommended approach.

Oracle advises:

"For high availability, use dual FastConnect connections with diverse paths to eliminate single points of failure in hybrid connectivity."This supports Option C. Reference:FastConnect High Availability - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/fastconnect.htm#ha).

Objective: Allow VCN-A to access on-premises (192.168.1.0/24) via VPN, isolate VCN-B using DRG route tables effectively and securely.

Option A: Single route table for both VCNs with NSGs on VCN-B to block traffic. This works but relies on NSGs, which are secondary to routing. Routing-level isolation is more secure and efficient.

Option B: Single route table for VCN-A with the VPN route, default table (no VPN route) for VCN-B. This isolates VCN-B effectively at the routing level, but managing one table across all attachments can complicate scaling.

Option C: Two route tables, both with VPN routes, then blocking VCN-B with security lists. This is inefficient—routes are advertised unnecessarily, relying on security lists instead of routing isolation.

Option D: Two route tables—DRG-RT-A with VPN route for VCN-A, DRG-RT-B with no VPN route for VCN-B. This ensures VCN-B has no path to on-premises at the DRG level, providing the strongest isolation.

Conclusion: Option D is the most effective and secure, leveraging routing for isolation rather than secondary security controls.

Oracle documentation states:

"DRG route tables control traffic between VCN attachments and external connections (e.g., VPN). Associate a unique route table with each attachment to enforce specific routing policies."

"To isolate a VCN, ensure its DRG route table contains no routes to the destination."Option D aligns with this approach. Reference:Dynamic Routing Gateway Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/managingDRGs.htm).

Objective:Enable transitive routing via a network appliance (e.g., firewall) between VCNs.

Transitive Routing Setup:DRG connects VCNs; appliance processes traffic.

Key Requirement:DRG must route traffic to the appliance’s private IP.

Evaluate Options:

A:Service Gateway is for OCI services, not transitive routing; incorrect.

B:Static routes on DRG to appliance ensure correct traffic flow; essential.

C:Load Balancer is optional, not essential for routing; incorrect.

D:LPG is for intra-region VCN peering, not appliance-DRG connection; incorrect.

Conclusion:DRG static routes to the appliance are critical for transitive routing.

Transitive routing with a network appliance requires explicit routing configuration. The Oracle Networking Professional study guide notes, "To enable transitive routing through a network appliance, configure static routes in the DRG route table pointing to the appliance’s private IP as the next hop" (OCI Networking Documentation, Section: Transitive Routing with DRG). This ensures traffic is processed by the appliance between VCNs.

Requirement Breakdown: Maintain a specific public IP for external communication with high availability (HA).

Option A: Private IP with NAT Gateway is for outbound traffic from private subnets, not inbound public access. It doesn’t support a fixed public IP for external clients.

Option B: Network Load Balancer (NLB) preserves client IPs (source IP) but doesn’t allow reserving a specific public IP. IPs are assigned dynamically, failing the requirement.

Option C: Flexible Load Balancer (Application Load Balancer) supports reserving a public IP, ensuring the legacy IP is maintained. It also provides HA across Availability Domains (ADs).

Option D: Multiple load balancers with DNS round-robin don’t maintain a single IP—clients see different IPs, violating the requirement.

Conclusion: Option C meets both the specific IP and HA needs efficiently.

Per Oracle documentation:

"The Application Load Balancer (Flexible Load Balancer) allows you to reserve a public IP address, which can be associated with the load balancer for consistent external access."

"It provides high availability by distributing traffic across multiple backend instances."This supports Option C. Reference:Load Balancer Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Balance/Concepts/balanceoverview.htm).