This EX200 practice question tests your understanding of manage users and groups. 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.
A user jdoe, who is a member of the group staff, reports they cannot access the directory /shared. The administrator runs getfacl /shared and receives the output shown. Which of the following explains the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
An ACL entry denies all permissions for jdoe
Option B is correct: the ACL has an explicit deny entry for jdoe (user:jdoe:---) that overrides the group permissions. Option A is incorrect because group staff has rwx. Option C is incorrect because the owner has rwx. Option D is incorrect because the mask is rwx and does not limit group.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related EX200 subnetting questions on CIDR, address ranges, and subnet selection.
Manage users and groups — This question tests Manage users and groups — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: An ACL entry denies all permissions for jdoe — Option B is correct: the ACL has an explicit deny entry for jdoe (user:jdoe:---) that overrides the group permissions. Option A is incorrect because group staff has rwx. Option C is incorrect because the owner has rwx. Option D is incorrect because the mask is rwx and does not limit group.
What should I do if I get this EX200 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related EX200 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Question Discussion
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