https://github.com/spikenode/DevOps-Interview-Questions

UNIX / LINUX Questions:

How would you discover how many file handles are open by a process?

lsof

List three standard command line performance monitoring utilities.

top

iostat

htop

Name three commands one could parse a CSV file with to display specific columns.

awk

cut

sed

HTTP QUESTIONS:

Provide four examples of HTTP return/status codes

404

500

200

403

Provide four examples of HTTP request methods

GET

POST

DELETE

PUT

Provide four examples of HTTP request (GET) or response headers.

Cookie

Header

Host

Data (response)

(Chrome Debugger)

NETWORKING QUESTIONS:

Name four of the seven layers of the OSI Model.

Transport (Level 4)

Application (Level 5)

IP (Level 3)

Session (Level 6)

Explain two differences between TCP and UDP.

TCP - connection oriented

UDP - not reliable (it doesnt have a mechanism to control the communication like SYN/SYN-ACK...)

Name four well-known TCP/UDP ports and what they are for:

53 UDP DNS

80 TCP HTTP

443 TCP HTTPS

22 TCP SSH

CS QUESTIONS:

Name two primitive data types

string

int

Name three data structures used in programming.

hashmaps

balanced trees

graphs

Name one way to produce a thread dump from a java process

• (java monitoring tools)

Name two common sorting algorithms.

Quicksort

Bubblesort

SCRIPTING QUESTIONS:

Please name two special variables within bash

$PWD

$HOME

Please name three basic regex characters and briefly describe usage.

regex=([0-9].?*) - For example any numbere

eregex=([0-9]{3}[0-9]{3}[0-9]{4}) - 415 746 0719

regex=([a-zA-Z].*) - For example a lowercase or capitalcase string (1 char-N chars)

Name four ways to control flow or influence operational progress within a program.

break

continue

return

exit