EX188 Registry And Security Practice Question
A user is running rootless Podman and needs to verify why a container cannot bind to TCP port 80. By default, unprivileged users cannot bind to ports below 1024. Which parameter controls the minimum unprivileged port that can be bound?
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
✓
net.ipv4.ip_unprivileged_port_start
The sysctl parameter net.ipv4.ip_unprivileged_port_start controls the lowest port unprivileged users can bind to.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
user.max_user_namespaces
Why it's wrong here
This parameter controls the maximum number of user namespaces allowed.
- ✗
net.ipv4.tcp_port_range
Why it's wrong here
tcp_port_range specifies the port range used for outgoing ephemeral connections.
- ✗
fs.inotify.max_user_watches
Why it's wrong here
inotify parameters relate to file system monitoring limits.
- ✓
net.ipv4.ip_unprivileged_port_start
Why this is correct
This kernel parameter determines the lowest port number that can be bound by non-root users.
About these practice questions
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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 Red Hat exam blueprint
This EX188 practice question is part of Courseiva's free Red Hat 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 EX188 exam.