This LFCS practice question tests your understanding of user and group management. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 security policy requires that all users in the 'admin' group must have a umask of 027 set automatically upon login. An administrator adds 'umask 027' to /etc/profile. However, users report that the umask is still 022. What is a likely cause?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The umask in /etc/profile is overridden by user-specific .bash_profile or .bashrc files.
Option A is correct because user-specific startup files (like .bash_profile) can override /etc/profile. Option B is wrong because /etc/profile is sourced automatically for login shells. Option C is possible but less likely since syntax is correct. Option D is wrong because /etc/profile executes before user files; any reset would be in user files.
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.
✓
The umask in /etc/profile is overridden by user-specific .bash_profile or .bashrc files.
The umask command in /etc/profile has a syntax error that is silently ignored.
Why it's wrong here
Syntax 'umask 027' is correct, but if there were an error, it would output a message.
✗
The admin placed the umask command after the call to /etc/bash.bashrc which resets it.
Why it's wrong here
/etc/profile executes before user files, and /etc/bash.bashrc is not typically sourced by /etc/profile.
✗
The admin forgot to run 'source /etc/profile' on each user's session.
Why it's wrong here
/etc/profile is automatically sourced for login shells.
Common exam traps
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.
Trap categories for this question
Command / output trap
Syntax 'umask 027' is correct, but if there were an error, it would output a message.
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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
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 LFCS subnetting questions on CIDR, address ranges, and subnet selection.
User and Group Management — This question tests User and Group Management — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: The umask in /etc/profile is overridden by user-specific .bash_profile or .bashrc files. — Option A is correct because user-specific startup files (like .bash_profile) can override /etc/profile. Option B is wrong because /etc/profile is sourced automatically for login shells. Option C is possible but less likely since syntax is correct. Option D is wrong because /etc/profile executes before user files; any reset would be in user files.
What should I do if I get this LFCS 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 LFCS 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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