1Z0-997-26 Security Practice Question
An incident response team needs to automatically isolate a compromised compute instance in OCI by revoking its network access while preserving its storage volumes for forensic analysis. Which sequence of actions should be automated using OCI Events and Functions?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Update the instance's Network Security Groups (NSGs) to remove existing rules and apply a restrictive quarantine NSG that denies all traffic.
To isolate a compromised instance while keeping volumes intact, the automated function should remove the instance's existing NSGs and attach a restrictive quarantine NSG that blocks all traffic, or disassociate its VNIC from active subnets, while leaving block volumes untouched.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Delete the VCN containing the instance to stop all routing.
Why it's wrong here
Deleting the entire VCN disrupts all other workloads in that network, which is overly destructive.
- ✗
Terminate the compute instance and delete all attached block volumes immediately.
Why it's wrong here
Terminating the instance and deleting volumes destroys critical forensic evidence needed for incident investigation.
- ✗
Revoke the IAM user credentials of the administrator who launched the instance.
Why it's wrong here
Revoking the administrator's credentials does not stop an already running, compromised compute instance.
- ✓
Update the instance's Network Security Groups (NSGs) to remove existing rules and apply a restrictive quarantine NSG that denies all traffic.
Why this is correct
Applying a quarantine NSG instantly cuts off network communication for the instance while preserving OS memory and storage volumes for forensics.
Visual reference
About these practice questions
Courseiva writes every 1Z0-997-26 question from scratch — 344 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Oracle exam blueprint
This 1Z0-997-26 practice question is part of Courseiva's free Oracle certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 1Z0-997-26 exam.