1Z0-1072-26 Networking Practice Question
An OCI administrator creates a subnet and associates a security list with it. An instance in this subnet cannot connect to an external API on HTTPS (port 443). The security list has an ingress rule for port 443, but no egress rules defined. Why is the connection failing?
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
✓
The security list lacks an egress rule allowing outbound traffic to port 443 (or all ports), or the default egress rule was removed.
By default, OCI Security Lists are stateful, meaning return traffic for ingress is automatically allowed. However, outbound (egress) traffic initiated by the instance requires an explicit egress rule (or a default egress rule allowing all traffic out) if egress rules are modified or restricted.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Ingress rules apply to outbound connections.
Why it's wrong here
Ingress rules govern incoming traffic, while outbound connections require egress rules.
- ✗
The instance needs a public IP address to make outbound API calls.
Why it's wrong here
Outbound calls can be made via a NAT Gateway or Service Gateway without the instance needing a public IP.
- ✗
Port 443 is blocked globally across all OCI regions.
Why it's wrong here
Port 443 is standard for HTTPS and is not blocked by OCI.
- ✓
The security list lacks an egress rule allowing outbound traffic to port 443 (or all ports), or the default egress rule was removed.
Why this is correct
Outbound connections initiated by an instance require a matching egress rule in stateful security lists.
Visual reference
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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 1Z0-1072-26 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 1Z0-1072-26 exam.