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1. The /proc directory in Linux primarily contains:
Application logs Process and kernel information User files System backups
2. True/False: The /etc directory is used to store user data and personal configuration files.
True False
3. Which of the following tools help you inspect system performance?
ps top vmstat chmod
4. The command journalctl is most useful for:
Editing configuration files Querying systemd logs Killing background processes Viewing CPU usage
5. You’re asked to debug a process crash on Ubuntu. Logs show no app output. What’s the most effective sequence?
Check /etc → Restart service Inspect /var/log → journalctl -xe → strace <PID> Clear cache → Restart VM Run kill -9 immediately
6. Why is Ubuntu not preferred in CodeXray development setups?
Pre-built packages for observability Strong community support Stability for servers Proprietary kernel modules
7. (True/False) Snaps allow installing applications without dependency conflicts.
True False
8. Which Linux command would you use to find a specific string within a log file?
ps tail grep chmod
9. The command git config --global user.email sets:
Local commit email only Email for all repositories under the user profile Email for a specific branch None of the above
10. Which actions are not part of the standard Git workflow?
git add git commit git push git rollback
11. (True/False) VS Code has no built-in Git support.
True False
12. You cloned a repository but forgot to create a new branch. After making changes, how do you fix it safely?
Create a new branch and use git cherry-pick git rebase to move commits. Both the above None of the above
13. Which VS Code extension is most relevant for developers to understand and manage their code repository workflows?
GitLens Beautify Jupyter Prettier
14. What is not the primary reason to prefer SSH for Git?
Secure automation No password prompts Reliable CI/CD integration Easier GUI authentication
15. (True/False) A git push always overwrites remote history.
True False
16. Developer A commits to main, Developer B commits later to the same file. Merge conflict arises. Best resolution?
Delete the branch Do nothing Use git pull --rebase to align and resolve before pushing Call team lead
17. The eBPF verifier ensures:
Code runs faster in user space Programs are safely executed within kernel boundaries All syscalls are blocked Modules auto-compile
18. (True/False) eBPF programs run directly in user space.
True False
19. Which observability tools use eBPF?
Signoz AppDynamics Splunk Cillium
20. You attach a kprobe to sys_enter_execve. What data can you capture?
Process name, PID, arguments invoked Process calls Execution Time Trace
21. Why does CodeXray avoid blocking policies?
eBPF can’t block To avoid interfering with customer systems during observation To reduce alerting Because alerts are disabled
22. Challenges with eBPF adoption include:
Kernel version mismatch No syscalls CPU deep profilling License restrictions
23. (True/False) eBPF requires kernel recompilation before each deployment.
True False
24. You see no eBPF metrics from a node. Possible cause?
Collector missing the data Kernel version not supported by current eBPF program. Incorrect eBPF probes
25. Which statement best describes CodeXray’s use of eBPF?
Captures syscall and network telemetry in real-time Used only for tracing apps Logs errors from containers Acts as a kernel debugger