Linux Primer for Network Engineers

Question 1

why network engineers shoud learn Linux

Answer 1

1. Network devices have Linux shell
2. Network devices allow running containers
3. Most software development environments are Linux-based
4. New open source projects such as Open vSwitch, Docker, and OpenStack all have a Linux foundation

Question 2

what attributes have made Linux popular in programming

Answer 2

1. Capable of both scale and micro footprint
2. It is open source
3. Development and fixes provided faster
4. Can run almost on any hardware
5. Stability
6. Availability of tools

Question 3

where sudo privileges are given

Answer 3

in sudoers file

Question 4

which Linux distributions does not provide root account by default

Answer 4

Ubuntu and Debian (note: Redhad and Centos provide it)

Question 5

explain -a

Answer 5

do not ignore entries starting with “.”

Question 6

explain -A (–almost-all)

Answer 6

do not list implied “.” and “..”

Question 7

what is relative path

Answer 7

relative to current or working directory

Question 8

what is absolute path

Answer 8

relative to the root directory /

Question 9

what does ../.. do

Answer 9

back two directories

Question 10

what does cd - do

Answer 10

back to previous working directory

Question 11

what are the two main operating systems

Answer 11

Redhat Ent Linux, Debian

Question 12

what are the most common RHEL derivatives

Answer 12

Fedora and Centos

Question 13

what are the most common Debian derivatives

Answer 13

Ubuntu, Mint

Question 14

list components of RHEL package mgmt

Answer 14

• rpm - install package
• yum - download and install package from repo
• .rpm - file extension

Question 15

list components of Debian package mgmt

Answer 15

• dpkg - install local package
• apt and apt-get - download and install package from repo
• .deb - file extension

Question 16

command for making all required sub-directories in the path

Answer 16

mkdir -p

Question 17

command to remove an entire directory tree

Answer 17

rm -r

Question 18

command to remove an empty directory

Answer 18

rmdir

Question 19

remove directory and all contens including write protected files

Answer 19

rm -rf

Question 20

what does “more” do

Answer 20

shows file content and displays on page at a time controlled by “space”

Question 21

what does “less” do

Answer 21

same as more but allows you to scroll up and down using “arrows”

Question 22

what does “head” do

Answer 22

show ten first lines of a file

Question 23

what does “tail” do

Answer 23

show ten last lines of a file

Question 24

command to compare two files together

Answer 24

diff

Question 25

explain "u+rw,u-x,go-rwx"

Answer 25

owner can read and write, all others don't have access

Question 26

displays real time processor utilization

Answer 26

top

Question 27

displays real time processor utilization in an easier to read format

Answer 27

htop

Question 28

displays the current user’s active processes

Answer 28

ps

Question 29

displays all users' active processes

Answer 29

ps aux

Question 30

how to kill all instances of a process

Answer 30

killall

Question 31

sends a signal to end a process by name

Answer 31

pkill