Oracle 1Z0-1124-25 Practice Exam Questions & Answers

Problem: OKE web tier pods cannot reach the application tier.

Traffic Flow: Web tier (OKE) initiates outbound (egress) traffic to application tier (port 8080).

NSG Role: Controls traffic at VNIC level; must allow egress from OKE and ingress to app tier.

Evaluate Options:

A: Missing egress rule on OKE NSG blocks traffic; plausible but incomplete context.

B: Ingress on OKE NSG affects incoming traffic, not outbound to app tier; incorrect.

C: No ingress on OKE NSG doesn't block egress to app tier; incorrect.

D: Egress limited to internet blocks app tier access (port 8080); most likely.

Conclusion: Missing egress rule to app tier NSG is the primary issue.

NSGs require explicit egress rules for outbound traffic. The Oracle Networking Professional study guide notes, 'For OKE pods to communicate with other tiers, the node pool's NSG must include egress rules to the destination NSG or CIDR on the required ports' (OCI Networking Documentation, Section: Network Security Groups with OKE). Option D reflects a common misconfiguration in IaC setups.

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: Filter Flow Logs for traffic rejected by a specific security list rule.

Option A: ''action'' = ''REJECT'' identifies rejected traffic; ''securityListRule'' with rule ID pinpoints the exact rule---correct.

Option B: ''status'' and ''securityRule'' aren't standard Flow Log fields (''action'' and ''securityListRule'' are)---incorrect.

Option C: ''direction'' and ''port'' filter traffic but don't specify rejection or rule---incorrect.

Option D: ''type'' and ''rule'' aren't valid Flow Log fields---incorrect.

Conclusion: Option A is the precise filtering method.

Oracle states:

'In Flow Logs, use the 'action' field ('REJECT') and 'securityListRule' field (rule ID) to filter traffic rejected by a specific security list rule.''

This validates Option A. Reference: Flow Logs Fields - Oracle Help Center (docs.oracle.com/en-us/iaas/Content/Network/Concepts/flowlogs.htm#fields).

Problem: VPN instability during peak hours due to latency and packet loss.

Evaluate Actions:

A: Optimizing IKE/IPSec reduces overhead; improves stability.

B: QoS prioritizes VPN traffic; enhances reliability.

C: Increasing MTU may worsen fragmentation if path MTU isn't matched; least effective.

D: Dedicated interconnect eliminates internet issues; most effective.

MTU Insight: Raising MTU without path MTU discovery risks more fragmentation, not less.

Conclusion: Increasing MTU is least likely to help.

VPN stability requires addressing network conditions. The Oracle Networking Professional study guide notes, 'Adjusting IKE/IPSec parameters or using QoS can stabilize VPN tunnels, while increasing MTU without path MTU alignment may exacerbate fragmentation' (OCI Networking Documentation, Section: VPN Troubleshooting). Dedicated interconnects are ideal, but MTU adjustment is risky here.

Problem Scope: Identify and adjust WAF rules causing false positives in Detection mode without disrupting traffic.

Detection Mode Behavior: Logs potential violations without blocking, allowing analysis.

Evaluate Options:

A: Use OCI Logging Analytics to pinpoint rule IDs from logs, then set rules to 'log only' for testing; efficient and non-disruptive.

B: Disabling all rules risks security and is time-consuming; inefficient.

C: Increasing sensitivity worsens false positives; counterproductive.

D: Whitelisting IPs is a temporary fix, not scalable or diagnostic; unsuitable.

Conclusion: Logging analysis with rule adjustment is the most efficient approach.

OCI WAF logs provide detailed insights for troubleshooting. The Oracle Networking Professional study guide states, 'In Detection mode, WAF logs all triggered rules, which can be analyzed in OCI Logging Analytics to identify false positives. Rules can then be adjusted to 'log only' to refine policies without affecting traffic' (OCI Networking Documentation, Section: Web Application Firewall). This method ensures precision and minimal disruption.

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).

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).