This XK0-005 practice question tests your understanding of system management. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 developer needs to grant a colleague read and write access to a directory /project, but the colleague should not have permission to delete any files created by the developer. The developer wants to set the directory so that all new files created in it automatically belong to the group 'project' and are writable by group. Which combination of configuration should be used?
Why wrong: This sets group rwx on the directory, but does not set default ACL for new files, so new files may not inherit group write.
D
chown .project /project && chmod 2775 /project
Why wrong: 2775 sets setgid and permissions, but new files may not have group write unless umask and group ownership are correct; no default ACL is set.
To achieve automatic group ownership and default permissions, set the setgid bit (chmod g+s) on the directory and use a default ACL to grant group read/write. Option C does both: chmod g+s sets the setgid bit so new files inherit the group, and setfacl with default:g:project:rw ensures new files get group rw. Option A gives rwx on directory but not default. Option B sets setgid and permissions but does not use default ACL, so new files may not get group rw. Option D sets sticky bit (1) which prevents users from deleting others' files, but does not automatically set group ownership or permissions.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
This sets group rwx on the directory, but does not set default ACL for new files, so new files may not inherit group write.
✗
chown .project /project && chmod 2775 /project
Why it's wrong here
2775 sets setgid and permissions, but new files may not have group write unless umask and group ownership are correct; no default ACL is set.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this XK0-005 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related XK0-005 NAT questions on configuration and troubleshooting.
System Management — This question tests System Management — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: chmod g+s /project && setfacl -m default:g:project:rw /project — To achieve automatic group ownership and default permissions, set the setgid bit (chmod g+s) on the directory and use a default ACL to grant group read/write. Option C does both: chmod g+s sets the setgid bit so new files inherit the group, and setfacl with default:g:project:rw ensures new files get group rw. Option A gives rwx on directory but not default. Option B sets setgid and permissions but does not use default ACL, so new files may not get group rw. Option D sets sticky bit (1) which prevents users from deleting others' files, but does not automatically set group ownership or permissions.
What should I do if I get this XK0-005 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related XK0-005 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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