CompTIA DataSys+

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. Manufacturer unitsDrive makers use decimal units: 1 TB = 1,000,000,000,000 bytes.
2. 2. Operating system unitsWindows reports binary units but labels them GB: 1 GiB = 1,073,741,824 bytes.
3. 3. Do the division1,000,000,000,000 ÷ 1,073,741,824 ≈ 931.
4. 4. Account for formattingThe filesystem and recovery partitions then consume a further few gigabytes.

Answer: No. The bytes are all there; the two sides count in different units. Say this to the customer in plain terms rather than quoting powers of two.

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.