Question 749 of 981

System Management →hardMultiple ChoiceObjective-mapped

XK0-005 System Management Practice Question

This XK0-005 practice question tests your understanding of system 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 system administrator needs to set the umask so that newly created files have permissions of 644 and directories have permissions of 755. Which umask value should be set?

A
0222
Why wrong: 0222 would remove write for all, resulting in 444 for files (r--r--r--), not desired.
B
0022
Correct: umask 022 subtracts group and others write permission, resulting in 644 for files and 755 for directories.
C
000
Why wrong: 000 would result in 666 for files and 777 for directories, which is too permissive.
D
077
Why wrong: 077 would remove all permissions for group and others, resulting in 600 for files and 700 for directories.

Full breakdown with real-world context →

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

✓

0022

Default base permissions are 666 for files and 777 for directories. To get 644 (rw-r--r--) for files: 666 - 644 = 022. To get 755 (rwxr-xr-x) for directories: 777 - 755 = 022. So umask 022 works for both.

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.

✗
0222
Why it's wrong here
0222 would remove write for all, resulting in 444 for files (r--r--r--), not desired.
✓
0022
Why this is correct
Correct: umask 022 subtracts group and others write permission, resulting in 644 for files and 755 for directories.
Related concept
CIDR notation defines the prefix length.
✗
000
Why it's wrong here
000 would result in 666 for files and 777 for directories, which is too permissive.
✗
077
Why it's wrong here
077 would remove all permissions for group and others, resulting in 600 for files and 700 for directories.

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.

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 XK0-005 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this XK0-005 question test?

System Management — This question tests System Management — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: 0022 — Default base permissions are 666 for files and 777 for directories. To get 644 (rw-r--r--) for files: 666 - 644 = 022. To get 755 (rwxr-xr-x) for directories: 777 - 755 = 022. So umask 022 works for both.

What should I do if I get this XK0-005 question wrong?

What is the key concept behind this question?

CIDR notation defines the prefix length.

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Last reviewed: Jul 4, 2026

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