Requirements:

Please answer the questions to the best of your abilities

Please do not look up answers online

Please provide a use case example for each question.

1 - What is df and the significance of utilizing it?

2 - What is du and what is the purpose for it?

3 - What is route and what is the purpose for it?

4 - What is ifconfig, and what relevant information does it provide you?

5 - How do you remotely connect to a linux workstation/server?

6 - What is the firewall that linux workstation/servers use?

7 - what is tail? How do I use it?

8 - what is head? How do I use it?

9 - How do you disable the network interface?

10 - where are linux's system logs located? What is the purpose for system logs?

11 - what is a pid?

12 - where and how do you change IPs?

13 - what is chkconfig?

14 - what is cron? How do you write a cron job?

15 - what is a gateway? Example?

16 - what is a process/service?

17 - what is chmod?

18 - what is chown?

19 - How do I mount a disk?

20 - what is /dev/sda?

21 - what is /dev/hda?

22 - how do I unmount a disk?

23 - where is the file to mount a disk from boot?

24 - what is root?

25 - what is '~'?

26 - what is a share-point on a disk in relationship to the mount-point?

27 - what is a mount-point on a disk in relationship to the share-point?

28 - what is DNS? What does it do?

29 - what is NTP? How do I sync time?

30 - How do I change time?

31 - what is FTP?

32 - what is watch?

33 - what is XML?

34 - what is RTT?

35 - How do I copy a file from one directory to another?

36 - If my disk is mounted as read-only, how do I remount to read-write without rebooting?

37 - How do I change the gateway on the fly?

38 - How do I change my network on the fly?

39 - How do I find a “defunct” service?

40 - what is the use of finding a defunct services?

41 - when I curl a site with debug turned on I get a 302 response, what does that mean?

42 - when I run a wget against a remote location, what am I attempting to do?

1 - Can I ping external websites without a gateway?

2 - How do I perform a reverse lookup with an IP address?

3 - How do I debug a process/service?

4 - How do I trace a route?

5 - What is recursion?

6 - how do I recursively change permissions with a top level folder and all subfolders?

7 - how do you multi-line grep?

8 - how do you write a regex for: 192.168.21.2?

9 - how do you write a regex to capture DST and SRC information: <21>Aug 21 19:20:45%ASA-200130: DST(4.4.4.4/80) and SRC(20.20.20.1/255)

10 - What is a kernel panic?

11 - What is MALLOC?

12 - What is errno=11 ?

13 - what is errno=12 ?

14 - if I have two interfaces, how do I switch the interface alias (eg. eth1 to eth0 or eth0 to eth1) through commandline?

15 - how do I ensure (not just check) that a service is running an operating?

16 - what is a proxy server?

17 - What does this error mean: "The proxy server received an invalid response from an upstream server?

18 - How do you increase the amount of connections apache can serve?

19 - How do you gracefully restart apache?

20 - how do you configure ssl for apache?

21 - what is a "weak cipher"?

22 - how do you configure a private key for apache?

23 - how do you configure a private cert for apache?

24 - how do you configure a CA-certificate for apache?

25 - what is SSL?

26 - what does SSL over HTTP ensure?

28 - What is an application server?

29 - What is an exception in relation to: programming / error logging?

30 - How do you access postgresql?

31 - How do you shrink tables in postgresql?

32 - How do you list tables in postgresql?

33 - How do you run a select statement?

34 - how do you update a table?

35 - how do you delete a table?

36 - how do you drop a table?

37 - how do you update a table from commandline?

38 - without rebooting, what is the easiest way to get rid of zombie processes?

39 - what is kill -10 used for?

40 - what is kill -9 used for?

41 - what is a coredump?

42 - how do you disable coredumps?

43 - how do you increase the amount of processes you can run at once to a user?

44 - what does it mean when swap memory is being used?

45 - what is the measurement for IO used for?

46 - How do you configure TLS certificates?

47 - What’s the difference between TLS 1.0, 1.1 and 1.2?

48 - How does having certificates make communication more secure?

49 - What is a weak cipher? How do I determine that I do not have weak ciphers enabled in openSSL?