Computer Experts

Selected Answer:

etc/shadow file

Correct Answer:

[None]

Response Feedback:

[None Given]

Selected Answer:

Passwd file, it reads user id info like user name phone number and so on

Correct Answer:

[None]

Response Feedback:

gecos field

Selected Answer:

They Child Processes keep running

Correct Answer:

[None]

Response Feedback:

process becomes child of init

Selected Answer:

It canceles all the Processes that the user 

Correct Answer:

[None]

Response Feedback:

shutdown

Selected Answer:

1- Single Point of failure if compromised

2-The security model is not strong enough for a network

3-High security environments enforce rules that cannot be implemented with traditional UNIX

4- Since some rules are implemented in command code, modification requires rewrite and recompilation

5- Minimal support for auditing

Correct Answer:

[None]

Response Feedback:

[None Given]

Selected Answer:

Root should run the init command to change the  run level using the letter s or the number 1 for example

Correct Answer:

[None]

Response Feedback:

telinit 1

Selected Answer:

To implement permanent changes to the backup device

Correct Answer:

[None]

Response Feedback:

Only if multiple dumps were being made to the same tape drive.  Failure to use the non-rewind would cause successive dumps to overwrite each other.

Selected Answer:

Kill Command

Correct Answer:

[None]

Response Feedback:

[None Given]

Selected Answer:

Kill process

Stop Process

Correct Answer:

[None]

Response Feedback:

[None Given]

Selected Answer:

Network Monitoring: Netstat, nethogs, iptraf, iftop

Disk I/O: iotop

CPU/ memory: top, Ps, htop, atop

Correct Answer:

[None]

Response Feedback:

[None Given]

Selected Answer:

.sh

Correct Answer:

[None]

Response Feedback:

directory

Selected Answer:

save

Correct Answer:

[None]

Response Feedback:

elevated privilege

Selected Answer:

#!/bin/bash

ls -al ~ > ~/ls.dat

ls -al ~ > ~/tree.dat

mkdir ~/backups

mv ~/ls.dat ~/tree.dat ~/backups

rename .dat .bu ~/backups/*.dat

Correct Answer:

[None]

Response Feedback:

#!/bin/bash find / -type f -name ‘*.log’ | while read fname; do cp $fname ~/logFiles; done find / -type f -name ‘*.log’ | while read fname; do cp $fname ~/logFiles; done

Selected Answer:

[None Given]

Correct Answer:

[None]

Response Feedback:

   minute       hour     day of month    month       week day              command        30                05                      *                    *                1,3,5              ~/scripts/fileCleanup.sh

Selected Answer:

#!/bin/bash

echo "Enter a filename to Move Copy or Delete"

read fileName

if [ -f "$fileName" ]; then

  echo "Enter C M or D to Move, Copy, or Delete"

  read command

  if [ "$command" = "C" ] || [ "$command" = "c" ]; then

    echo "enter destination directory"

    read dest

    cp $fileName $dest/$fileName

  elif [ "$command" = "M" ] || [ "$command" = "m" ]; then

    echo "enter destination directory"

    read dest

    mv $fileName $dest/$fileName

  elif [ "$command" = "D" ] || [ "$command" = "d" ]; then

    rm $fileName

  else

    echo "Invalid entry, Please redo Script"

  fi

else

   echo "The File entered  doesn't exist"

fi

Correct Answer:

[None]

Response Feedback:

#!/bin/bash echo "Enter search term or REGEX" read searchTerm grep -E -r $searchTerm  dev/logs/*

Selected Answer:

[None Given]

Correct Answer:

[None]

Response Feedback:

kern\.(alert|crit|emerg)

Selected Answer:

[None Given]

Correct Answer:

[None]

Response Feedback:

[0-9]{2}-[0-9]{2}-[0-9]{4}    OR      \d{2}-\d{2}-\d{4}

Selected Answer:

(HDD)

Cost wise they cost only around $0.075 per gigabyte, very cheap (buying a 4TB model)

Capacity wise Typically 500GB – 2TB for notebook size drives

Operating system boot time takes around 40 seconds average bootup time

File copy / write speed The range can be anywhere from 50 – 120MB / s

Encryption Full Disk Encryption (FDE) Supported on some models

when it comes to power they have more power draw, it averages 6 – 7 watts and therefore uses more battery.

Mean time between failure rate of 1.5 million hours

(SSD)

Cost wise they are expensive, $1.00 per gigabyte (based on buying a 240GB drive)

Capacity Typically not larger than 512GB for notebook size drives

Operating system boot time takes around 22 seconds average bootup time

File copy / write speed generally above 200 MB/s and up to 500 MB/s for cutting edge drives

Encryption Full Disk Encryption (FDE) Supported on some models

Power Draw / Battery Life, SSD's have less power draw, averages 2 – 3 watts, resulting in 30+ minute battery boost

Mean time between failure rate of 2.0 million hours

Correct Answer:

[None]

Response Feedback:

[None Given]

Selected Answer:

The bootstrap loader is a small program that has a single function: It loads the operating system into memory and allows it to begin operation. In the most basic form, the bootstrap loader sets up the small driver programs that interface with and control the various hardware subsystems of the computer. It sets up the divisions of memory that hold the operating system, user information and applications. It establishes the data structures that will hold the myriad signals, flags and semaphores that are used to communicate within and between the subsystems and applications of the computer. Then it turns control of the computer over to the operating system.

Correct Answer:

[None]

Response Feedback:

a.       POST of the Bios looks for attached storage devices and performs some initialization

b.      An internal table of the BIOS lists the order to search attached devices by type and drive number. 

                                                               i.      Using that table, the system bus is interrogated to see if the highest priority devices are attached.  If no attachment is detected, the BIOS tries to detect the next lower device type. Usually Hard-drives are at the bottom of the list.

                                                             ii.      When a device is detected, the BIOS searches the first storage sector of the device, looking for a Master Boot Record, (MBR).

1.       The MBR partition table is searched for an active/bootable partition

2.       The last two bytes of the MBR are read to verify the boot signature

3.       If conditions 1 & 2 are met, the boot code from the MBR is loaded into main memory and run

4.       If conditions 1 & 2 are not met, but a device is attached, the system hangs