The correct answer is that the configuration prevents Apache directory listing, which is a security issue addressed by the `-Indexes` option. When a web server lacks a default index file like index.html, Apache normally generates a list of all files and subdirectories in that folder, exposing sensitive data or structure to attackers. The `-Indexes` directive disables this behavior, forcing a 403 Forbidden error instead. On the CompTIA SecurityX CAS-004 exam, this appears in questions about web server hardening and access controls, often as a distractor where `AllowOverride None` or `Allow from all` are incorrectly chosen. A common trap is confusing directory listing prevention with access restriction—remember that `-Indexes` only hides the file list, while `Allow` controls who can reach the content. For a memory tip, think of “Indexes” as the table of contents for a folder; removing the minus sign means you’re taking away the table, so no listing is shown.
CAS-004 Practice Question: Application Environment, Configuration and Security
This CAS-004 practice question tests your understanding of application environment, configuration and security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
Refer to the exhibit.
<Directory /var/www/html>
Options -Indexes
AllowOverride None
Order allow,deny
Allow from all
</Directory>
Which security issue is addressed by this configuration?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Prevents directory listing
The `-Indexes` option disables directory listing, preventing visitors from seeing the contents of a directory if no index file is present. `AllowOverride None` disables .htaccess overrides, and `Allow from all` permits access.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Enables server-side includes
Why it's wrong here
Server-side includes require `+Includes`, not present.
✓
Prevents directory listing
Why this is correct
`-Indexes` explicitly disables directory listing.
Related concept
Standard ACLs match source addresses.
✗
Blocks access to all files
Why it's wrong here
`Allow from all` permits access; it does not block.
✗
Enables CGI execution
Why it's wrong here
CGI execution requires `+ExecCGI`, not shown here.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Trap categories for this question
Command / output trap
CGI execution requires `+ExecCGI`, not shown here.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related CAS-004 ACL questions on filtering logic and placement.
Application Environment, Configuration and Security — This question tests Application Environment, Configuration and Security — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Prevents directory listing — The `-Indexes` option disables directory listing, preventing visitors from seeing the contents of a directory if no index file is present. `AllowOverride None` disables .htaccess overrides, and `Allow from all` permits access.
What should I do if I get this CAS-004 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related CAS-004 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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