Oracle Oracle Cloud Infrastructure 2025 Networking Professional 1z0-1124-25 Exam Dumps: Updated Questions & Answers (October 2025)

Understand the Requirement: The goal is high availability (HA) and automatic failover for a Site-to-Site VPN between an on-premises network and OCI with minimal disruption.

Evaluate Option A: A single VPN connection with one tunnel lacks redundancy. If the tunnel fails, there’s no failover mechanism, as OCI doesn’t inherently provide automatic failover for a single tunnel. This is a single point of failure.

Evaluate Option B: A single VPN connection with two tunnels using different CPE IP addresses leverages OCI’s IPSec VPN capabilities. OCI supports multiple tunnels per VPN connection, and using distinct CPE IPs (e.g., via different ISPs or devices) ensures that if one tunnel fails (due to ISP or CPE failure), the second tunnel remains active. OCI’s Dynamic Routing Gateway (DRG) automatically reroutes traffic to the active tunnel using IKE and IPSec health checks.

Evaluate Option C: Two separate VPN connections, each with one tunnel and different CPE IPs, also provide HA. Using BGP, routes are advertised redundantly. However, managing two VPN connections is more complex than a single connection with two tunnels, and BGP failover might introduce slight delays compared to IPSec tunnel failover.

Evaluate Option D: Two tunnels with the same CPE IP address within one VPN connection don’t provide true HA. If the CPE or its ISP fails, both tunnels fail, as they share a single point of failure.

Conclusion: Option B is the simplest, most resilient configuration that ensures automatic failover with minimal disruption using OCI’s native VPN capabilities.

OCI’s Site-to-Site VPN supports multiple tunnels within a single IPSec connection for redundancy. According to the Oracle Help Center:

"You can configure multiple tunnels for a single IPSec connection to provide redundancy. OCI uses IKE (Internet Key Exchange) to monitor tunnel health and automatically fails over to an active tunnel if one becomes unavailable."

"For maximum availability, use different CPE public IP addresses for each tunnel (e.g., different ISPs or devices)."This aligns with Option B, ensuring HA without the complexity of separate VPN connections or BGP. Reference:Site-to-Site VPN Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/settingupIPSec.htm).

Problem Scope:Load balancer (public subnet) cannot reach application servers (private subnet).

Connectivity Flow:Load balancer initiates traffic to application servers; application servers respond. Key checkpoints: routing and security rules.

Analyze Routing:Private subnets typically don’t route to an Internet Gateway by default; they use NAT or Service Gateways. Misrouting (Option B) would affect outbound traffic, not inbound from the load balancer.

Security Rules:

Ingress (App Servers):Must allow traffic from the load balancer’s IP range.

Egress (Load Balancer):Must allow traffic to the application servers.

Evaluate Options:

A:Missing ingress rule on application servers’ security list blocks load balancer traffic; most likely.

B:Incorrect default route affects outbound, not inbound; less likely.

C:NAT misconfiguration impacts outbound, not inbound; incorrect.

D:Load balancer egress is necessary but secondary to application server ingress.

Conclusion:Ingress rule absence on the application server subnet is the primary blocker.

Security lists control traffic at the subnet level in OCI. The Oracle Networking Professional study guide explains, "For a load balancer in a public subnet to communicate with instances in a private subnet, the private subnet’s security list must include an ingress rule allowing traffic from the load balancer’s IP range" (OCI Networking Documentation, Section: Security Lists). Since Terraform deployed the infrastructure, a misconfigured security list is a common oversight.

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: Identify the OCI resource for private, low-latency VCN-to-VCN connectivity in the same region.

Option A: DRG connects VCNs to external networks (e.g., on-premises) or across regions, not for same-region peering—incorrect.

Option B: LPG is designed for private peering of VCNs within the same region, ensuring low-latency communication—correct.

Option C: Internet Gateway provides public internet access, not private connectivity—incorrect.

Option D: Service Gateway connects VCNs to OCI services, not other VCNs—incorrect.

Conclusion: Option B is the appropriate resource.

Oracle documentation states:

"A Local Peering Gateway (LPG) enables private connectivity between two VCNs in the same region, providing direct, low-latency communication."This confirms Option B. Reference:Local VCN Peering Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/localVCNpeering.htm).

Goal: Capture and analyze traffic metadata for anomalies and troubleshooting.

Option A: NSGs control traffic but don’t capture metadata—incorrect.

Option B: Flow Logs record detailed traffic metadata (e.g., IPs, ports), perfect for analysis—correct.

Option C: Route Tables manage routing, not metadata—incorrect.

Option D: Service Gateway enables service access, not traffic logging—incorrect.

Conclusion: Flow Logs are best suited.

Oracle documentation confirms:

"Flow Logs capture network traffic metadata within a VCN, enabling anomaly detection and connectivity troubleshooting.”This supports Option B. Reference:Flow Logs Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Concepts/flowlogs.htm).

Requirements:Quick, cheap, encrypted VPN; interim before FastConnect.

VPN Options:

Static VPN:Simple, native, low cost.

Third-Party Appliance:Complex, costly.

Service Gateway:Not for VPN; incorrect.

BGP VPN:Dynamic, more setup; less quick.

Evaluate Options:

A:Static VPN is fast, secure, budget-friendly; correct.

B:Appliance adds cost and complexity; incorrect.

C:Misaligned use of Service Gateway; incorrect.

D:BGP is overkill for pilot; less efficient.

Conclusion:Static VPN via DRG is most suitable.

Static VPN is ideal for quick setups. The Oracle Networking Professional study guide notes, "A Site-to-Site VPN with static routing via DRG provides a fast, encrypted connection for short-term needs, minimizing cost and setup time" (OCI Networking Documentation, Section: Site-to-Site VPN). This fits the pilot project perfectly.

Zero Trust Principles:Require explicit, identity-based access controls at every network stage.

Evaluate OCI Services:

Internet Gateway:Enables public internet access, no identity-based control.

Service Gateway:Provides private service access, no granular routing control.

NSGs:Offer stateful, identity-based rules at the VNIC level.

DRG:Facilitates routing, not identity-based access control.

NSG Fit:NSGs allow rules based on VNIC identity, source/destination IP, and ports, aligning with Zero Trust.

Conclusion:NSGs are the best fit for granular, identity-based routing control.

NSGs are pivotal for Zero Trust in OCI. The Oracle Networking Professional study guide states, "Network Security Groups provide granular, stateful security rules that can be applied to specific VNICs, enabling identity-based access controls essential for Zero Trust architectures" (OCI Networking Documentation, Section: Network Security Groups). Unlike security lists (subnet-level), NSGs offer instance-level precision.

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.

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.

Constraints: High bandwidth, low latency, secure private connection, redundancy.

Option A: Single VPN Connect offers security but lacks high bandwidth, low latency, and redundancy—unsuitable for migration needs.

Option B: Multiple VPNs improve redundancy but still rely on public internet, limiting bandwidth and latency performance compared to dedicated circuits.

Option C: Single FastConnect provides high bandwidth, low latency, and privacy via a dedicated line, but lacks redundancy.

Option D: Multiple FastConnect circuits ensure high bandwidth and low latency with redundancy. Adding multiple VPNs as backup enhances resilience, meeting all constraints.

Conclusion: Option D is the most suitable and resilient, balancing performance and continuity.

Oracle states:

"FastConnect provides a private, high-bandwidth, low-latency connection to OCI. Use multiple circuits for redundancy."

"Combine FastConnect with IPSec VPN for additional failover options."Option D aligns with this guidance. Reference:FastConnect Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/fastconnect.htm).