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Oracle 1z0-1124-25 Exam Syllabus Topics:
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Oracle Cloud Infrastructure 2025 Networking Professional Sample Questions (Q62-Q67):
NEW QUESTION # 62
You are a Cloud Architect troubleshooting connectivity issues in your OCI environment. Your application servers, residing in private subnets within a VCN, need to access Object Storage within the same region to retrieve critical data. You have confirmed that there are no NSG rules blocking traffic between the subnets.
However, the instances cannot access Object Storage. You have a Service Gateway configured, and route rules in the private subnets directing traffic for Oracle Services to the Service Gateway. What is the most likely cause of this issue?
Answer: C
Explanation:
* 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.
NEW QUESTION # 63
You are using Terraform to deploy a multi-tier application architecture consisting of a public subnet hosting a load balancer, a private subnet hosting application servers, and another private subnet hosting a database. The Terraform code successfully creates all the required infrastructure, including route tables and security lists.
However, after deployment, you realize that the load balancer cannot reach the application servers in the private subnet. You have verified that the load balancer is healthy and the application servers are running.
What is the most likely cause of this connectivity problem?
Answer: D
Explanation:
* 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.
NEW QUESTION # 64
You have configured DNSSEC for your domain hosted on OCI DNS. You understand the importance of regularly rotating your Key Signing Key (KSK) to maintain security best practices. Which of the following statements regarding KSK rotation in OCI DNS is TRUE?
Answer: B
Explanation:
* 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).
NEW QUESTION # 65
You are setting up a Site-to-Site VPN connection between your on-premises network and OCI. You have generated the IKE pre-shared key and configured the VPN connection in OCI. You now need to configure your on-premises Customer Premises Equipment (CPE). Which information from the OCI console is ESSENTIAL for configuring your on-premises CPE to establish the VPN connection?
Answer: D
Explanation:
* 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).
NEW QUESTION # 66
You are designing a hybrid cloud architecture connecting your on-premises network to OCI. You have established a Site-to-Site VPN between your on-premises network and an OCI DRG. You have two VCNs attached to the DRG: VCN-A (10.0.0.0/16) and VCN-B (10.1.0.0/16). You need to ensure that only VCN-A can communicate with the on-premises network (192.168.1.0/24), while VCN-B should remain isolated. What is the MOST effective and secure method to achieve this connectivity requirement using DRG route tables?
Answer: A
Explanation:
* 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).
NEW QUESTION # 67
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