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

Requirement:Transitive routing across regions and to on-premises, privately.

Components:

LPG:Intra-region VCN peering; limited scope.

DRG:Cross-region and on-premises routing via private backbone.

Service Gateway:OCI service access; not transitive.

Internet Gateway:Public internet; not private.

Evaluate Options:

A:Region-specific; incorrect.

B:Supports multi-region and on-premises; correct.

C:Service-focused; incorrect.

D:Public; incorrect.

Conclusion:DRG is the key component.

DRG enables complex routing scenarios. The Oracle Networking Professional study guide notes, "The Dynamic Routing Gateway (DRG) facilitates transitive routing between VCNs in different regions and on-premises networks over OCI’s private backbone" (OCI Networking Documentation, Section: Dynamic Routing Gateway). This meets both requirements efficiently.

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.

Analyze Connectivity Successes:Instance A can ping its subnet gateway (10.0.1.1), indicating that local subnet routing and security rules are functioning for IPv4. It can also ping Instance B’s IPv6 address (fc00:1:2::20), confirming that IPv6 routing and security rules between subnets are operational.

Identify the Failure:Instance A cannot ping Instance B’s IPv4 address (10.0.2.20). Since security lists and NSGs allow all traffic, the issue is unlikely to be a security configuration problem.

Examine Routing for Instance A:The route table for Instance A’s subnet (10.0.1.0/24) has a rule directing traffic to 10.0.2.0/24 via the VCN Local Peering Gateway (LPG). In OCI, LPGs are used for intra-region VCN peering, but here, both instances are in the same VCN, so this rule is likely a misconfiguration or irrelevant unless peering is involved. However, the successful IPv6 ping suggests basic connectivity exists.

Check Return Path from Instance B:For a ping to succeed, Instance B must send ICMP replies back to Instance A (10.0.1.10). Instance B’s subnet (10.0.2.0/24) needs a route table entry to send traffic to 10.0.1.0/24. Without this, replies are dropped, causing the IPv4 ping to fail. The IPv6 success indicates that IPv6 routing is correctly configured both ways, possibly via SLAAC or default routes.

Evaluate Options:

A:Incorrect. IPv6 is enabled, as Instance A pings Instance B’s IPv6 address.

B:Correct. Missing route for 10.0.1.0/24 in Instance B’s subnet prevents IPv4 replies.

C:Incorrect. Security lists and NSGs can filter IPv6 traffic in OCI.

D:Incorrect. Ping supports IPv6, as evidenced by the successful IPv6 ping.

The most probable cause is a missing route in Instance B’s subnet route table. In OCI, each subnet has its own route table, and for instances in different subnets within the same VCN to communicate, both subnets must have appropriate routes. The successful IPv6 ping suggests that IPv6 routing is intact (likely due to default behavior or SLAAC), but IPv4 requires explicit routing. Per the Oracle Networking Professional study guide, "Route tables must be configured to direct traffic to the appropriate next hop for inter-subnet communication within a VCN" (OCI Networking Documentation, Section: Virtual Cloud Networks).

Requirements:Global access, geo-routing, advanced traffic management, DDoS protection.

Load Balancer Options:

Regional LB:Single-region, no global routing or advanced policies.

NLB:Layer 4, no HTTP-based traffic management or DDoS features.

Global LB with Steering Policies:Layer 7, supports geo-routing and policies.

Flexible LB:Not a specific OCI service.

Assess Fit:

A:Lacks global and advanced features; unsuitable.

B:No Layer 7 or DDoS protection; incorrect.

C:Meets all requirements with geo-routing, steering policies, and WAF integration; best fit.

D:Non-existent service; incorrect.

Conclusion:Global LB with steering policies is the best solution.

The Global Load Balancer with Traffic Management Steering Policies supports global applications. The Oracle Networking Professional study guide explains, "Global Load Balancer enables geo-based routing and advanced traffic policies like A/B testing and weighted distribution, integrating with OCI WAF for DDoS protection" (OCI Networking Documentation, Section: Load Balancing - Traffic Management). This aligns with all specified requirements.

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).

Requirement: Private, IAM-secured access to Object Storage.

Option A: Public subnet with Internet Gateway uses public IPs—violates policy.

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

Option C: Service Gateway enables private access to Object Storage, paired with IAM for auth—correct.

Option D: Public subnet with firewall still relies on public IPs—incorrect.

Conclusion: Option C meets all requirements.

Oracle states:

"Use a Service Gateway for private access to OCI Object Storage from a private subnet, with IAM policies for authentication and authorization."This supports Option C. Reference:Service Gateway Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/servicegateway.htm).