CompTIA DataAI+

1. 1. Split the stringIgnore the leading file-type character, then take three groups: owner rwx, group r-x, others r--.
2. 2. Score each groupread = 4, write = 2, execute = 1. Owner 4+2+1 = 7. Group 4+0+1 = 5. Others 4+0+0 = 4.
3. 3. Read the numberThe permissions are 754.
4. 4. Build the targetrwx = 7, r-x = 5, --- = 0, so the goal is 750.

Answer: -rwxr-xr-- is 754; chmod 750 script.sh produces rwxr-x---. A 'Permission denied' on your own script is usually a missing execute bit (chmod +x).

1. 1. Reserve for the hostThe host operating system and hypervisor need their own memory — reserve about 4 GB.
2. 2. Divide what remains16 − 4 = 12 GB available. 12 ÷ 4 = 3 VMs.
3. 3. Check CPUCores can be oversubscribed; memory generally cannot. Two virtual CPUs each across 3 VMs is 6 of 8 cores — comfortable.
4. 4. Check diskDynamically expanding disks grow over time; confirm free space on the host volume before you build.

Answer: Three 4 GB VMs. Memory is the hard limit: overcommit it and the host swaps to disk and everything crawls.

1. 1. Filter the linesgrep 'Failed password' /var/log/auth.log narrows thousands of lines to the ones that matter.
2. 2. Extract the fieldPipe into awk '{print $(NF-3)}' to pull the source IP from each line.
3. 3. Group themsort groups identical addresses together; uniq -c then counts each group.
4. 4. Rank themsort -nr puts the noisiest address at the top.

Answer: grep 'Failed password' /var/log/auth.log | awk '{print $(NF-3)}' | sort | uniq -c | sort -nr — each command does one job and the pipe passes text along.

1. 1. List impact and urgencyA: one user's mouse. B: the finance team of 12 cannot print payroll, due today. C: a director's laptop is slow. D: the shared file server is offline for everyone.
2. 2. Score impactImpact is how many people are stopped: D = whole site, B = 12, A and C = 1 each.
3. 3. Score urgencyUrgency is how time-bound it is: B has a same-day deadline; C has none beyond annoyance.
4. 4. Combine, do not let seniority decidePriority = impact × urgency. Rank: D, B, then A (blocking one person's work) then C (degraded, still working).

Answer: D, B, A, C — and set expectations with everyone in the queue. A job title is not a priority level; a documented matrix is what you defend the order with.