Pass the Oracle Cloud Infrastructure 1z0-1124-25 Questions and answers with ExamsMirror

Requirement Analysis: Strict compliance mandates logging all user access to private resources in a multi-tier setup.

Option A Assessment: Dynamic port forwarding with no logging fails compliance, as it provides no audit trail.

Option B Assessment: Managed Bastion sessions in OCI offer detailed logging (e.g., session start/end times, user IDs), integrated with OCI Logging. This meets compliance needs with a managed, scalable solution.

Option C Assessment: SSH port forwarding with minimal logs doesn’t provide the detailed auditing required for strict compliance.

Option D Assessment: A jump server with manual logging is error-prone, lacks scalability, and isn’t a managed OCI service, making it less suitable.

Conclusion: Option B provides the most robust, compliance-ready solution with detailed logging.

From Oracle’s Bastion documentation:

"OCI Bastion provides managed SSH sessions with detailed logging capabilities, capturing user access details for audit and compliance. Enable session logging to record all activities."This supports Option B as the best choice. Reference:Bastion Service Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Bastion/Concepts/bastionoverview.htm).

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).

Requirements: HA, HTTP/HTTPS support, health checks, cost-effectiveness.

Option A: NLB with TCP is Layer 4, lacks HTTP/HTTPS features—incorrect.

Option B: Flexible Load Balancer (Application LB) supports Layer 7 HTTP/HTTPS and health checks, ideal for production—correct.

Option C: NLB with UDP is irrelevant for HTTP/HTTPS—incorrect.

Option D: Flexible LB with TCP only limits Layer 7 features—incorrect.

Conclusion: Option B meets all needs efficiently.

Oracle states:

"The Application Load Balancer (Flexible LB) supports HTTP/HTTPS with health checks, suitable for production workloads."This supports Option B. Reference:Load Balancer Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Balance/Concepts/balanceoverview.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).

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.

Problem:DNSSEC validation fails post-setup.

DNSSEC Chain:Requires DS record in parent zone for trust.

Evaluate Causes:

A:Low TTL affects caching, not validation; unlikely.

B:Missing DS in parent zone breaks chain; most likely.

C:Resolver config is client-side, not affecting external tools; incorrect.

D:OCI uses standard algorithms; highly unlikely.

Conclusion:Registrar delay in publishing DS is the primary cause.

DNSSEC relies on the parent zone. The Oracle Networking Professional study guide explains, "DNSSEC validation fails if the registrar hasn’t published the DS record in the parent zone, as this breaks the chain of trust" (OCI Networking Documentation, Section: DNSSEC Troubleshooting). This is a common post-enablement issue.

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).

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).

Requirement: Private communication between VCNs in different OCI regions via DRG.

Option A: LPGs are for same-region VCN peering, not cross-region—incorrect.

Option B: Service Gateways are for OCI service access, not VCN-to-VCN routing—incorrect.

Option C: Attaching both VCNs to a single DRG (via Remote Peering Connections implicitly) and configuring route tables enables cross-region communication over OCI’s backbone. This is the standard approach.

Option D: Internet Gateways use public IPs, which is insecure and not private—incorrect.

Conclusion: Option C is the necessary configuration for DRG-based cross-region connectivity.

Oracle documentation confirms:

"To connect VCNs in different regions, attach each to a DRG using Remote Peering Connections (RPCs). Configure DRG route tables to route traffic between VCN CIDRs."Option C reflects this setup (RPCs are implied). Reference:VCN Peering Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/remoteVCNpeering.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).