Technical Interview Questions Network/Security Jobs

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What is a register?

https://whatis.techtarget.com/definition/register


What command would you use to view the last lines in a file?

https://en.wikipedia.org/wiki/Tail_(Unix)


In computer networking, what is MTU?

https://en.wikipedia.org/wiki/Maximum_transmission_unit


What is a Botnet?

https://en.wikipedia.org/wiki/Botnet


What is MetaSploit?

https://en.wikipedia.org/wiki/Metasploit_Project


What is Wireshark?

https://en.wikipedia.org/wiki/Wireshark


What is Base64?

https://en.wikipedia.org/wiki/Base64


What is hashing-vs-encryption-vs-encoding?


https://cheapsslsecurity.com/blog/explained-hashing-vs-encryption-vs-encoding/


https://www.packetlabs.net/encryption-encoding-and-hashing/geeksforgeeks.org/encryption-encoding-hashing


Put the following layers in correct order in the OSI model:

•          Application layer

•          Data link layer

•          Network layer

•          Physical layer

•          Presentation layer

•          Session layer

•          Transport layer

 

https://en.wikipedia.org/wiki/OSI_model


https://www.networkworld.com/article/3239677/the-osi-model-explained-and-how-to-easily-remember-its-7-layers.html


What is a ”rainbow table” and what can it be used for?

https://en.wikipedia.org/wiki/Rainbow_table

https://www.geeksforgeeks.org/understanding-rainbow-table-attack/



What is SQL-injection, what can you achieve with it?

 

https://portswigger.net/web-security/sql-injection


What are the top security threats to a company?


https://www.gcit.net/blog/computer-security-threats-business-it


https://expertinsights.com/insights/the-top-5-biggest-cyber-security-threats-that-small-businesses-face-and-how-to-stop-them/


https://www.celerium.com/blog/7-network-security-threats-to-your-organization-today


Describe in short how the TCP 3-Way Handshake works?


https://docs.microsoft.com/en-us/troubleshoot/windows-server/networking/three-way-handshake-via-tcpip


https://www.guru99.com/tcp-3-way-handshake.html


https://www.geeksforgeeks.org/tcp-3-way-handshake-process/


Where is the CPU register located?


https://en.wikipedia.org/wiki/Processor_register


What does http response code 500 mean?


https://en.wikipedia.org/wiki/List_of_HTTP_status_codes


https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/500

Put these terms on the correct layer:

•          SSL

•          USB

•          DNS

•          IPv4

•          FTP


https://en.wikipedia.org/wiki/Internet_protocol_suite

https://en.wikipedia.org/wiki/Physical_layer

https://en.wikipedia.org/wiki/OSI_model



Collision attacks vs rainbow tables


https://en.wikipedia.org/wiki/Rainbow_table

https://www.geeksforgeeks.org/understanding-rainbow-table-attack/

https://en.wikipedia.org/wiki/Collision_attack



How to write a code to get hostnames of a list of IP addresses?


https://unix.stackexchange.com/questions/424662/script-command-to-get-ips-from-list-of-hostnames-and-combine-into-a-single-fil/424667



What is the main IT  security risk to an organisation?


https://www.ccsinet.com/blog/common-security-risks-workplace/


What are the layers of the OSI and TCP/IP model?


https://www.geeksforgeeks.org/tcp-ip-model/


https://www.guru99.com/tcp-ip-model.html


https://en.wikipedia.org/wiki/OSI_model


https://www.networkworld.com/article/3239677/the-osi-model-explained-and-how-to-easily-remember-its-7-layers.html


https://en.wikipedia.org/wiki/Internet_protocol_suite





What is Wireshark


https://www.csoonline.com/article/3305805/what-is-wireshark-what-this-essential-troubleshooting-tool-does-and-how-to-use-it.html



What is SQL Injection?


https://portswigger.net/web-security/sql-injection


Which command is a command which prints the last few number of lines of a certain file, then terminates?


https://www.linux.com/training-tutorials/14-tail-and-head-commands-linuxunix/

How to Fix the Blue Screen of Death on Windows?


https://www.wikihow.com/Fix-the-Blue-Screen-of-Death-on-Windows


https://www.lifewire.com/how-to-fix-a-blue-screen-of-death-2624518


https://www.windowscentral.com/how-troubleshoot-blue-screen-errors-windows-10#:~:text=How%20to%20fix%20blue%20screen%20error%20with%20desktop,5%20Troubleshoot%20bug%20check%20with%20Event%20Viewer.%20



How to view a memory dump to troubleshoot a windows crash


https://www.techrepublic.com/blog/windows-and-office/how-do-i-use-windbg-debugger-to-troubleshoot-a-blue-screen-of-death/


https://docs.microsoft.com/en-us/troubleshoot/windows-client/performance/read-small-memory-dump-file



Kernel Dump vs small memory dump


https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/varieties-of-kernel-mode-dump-files


https://docs.microsoft.com/en-us/troubleshoot/windows-server/performance/memory-dump-file-options


https://superuser.com/questions/717449/should-i-use-a-small-memory-dump-or-kernel-memory-dump


https://www.howtogeek.com/196672/windows-memory-dumps-what-exactly-are-they-for



How to troubleshoot performance/memory issues on a workstation?


https://techcommunity.microsoft.com/t5/ask-the-performance-team/alternative-tools-for-application-hangs/ba-p/1685245


https://techcommunity.microsoft.com/t5/ask-the-performance-team/memory-leaks-in-a-process/ba-p/1655208


https://techcommunity.microsoft.com/t5/ask-the-performance-team/mystery-memory-leak-where-did-my-memory-go/ba-p/1675369



How to fix: Svchost.exe (netsvcs) memory leak or high CPU usage problems?


https://www.online-tech-tips.com/computer-tips/how-to-fix-svchostexe-errors-and-problems-with-high-cpu-usage/


https://www.wintips.org/how-to-fix-svchost-exe-netsvcs-memory-leak-or-high-cpu-usage-problems/


https://answers.microsoft.com/en-us/windows/forum/windows_10-other_settings-winpc/how-to-fix-svchostexe-using-100-cpu-windows-10/37486420-d5c1-460a-888c-693dd0510552


https://thegeekpage.com/how-to-fix-slow-computer-problem-in-windows-10-pc


What is WMI?


https://en.wikipedia.org/wiki/Windows_Management_Instrumentation


https://docs.microsoft.com/en-us/windows/win32/wmisdk/about-wmi



What Ring-mode is kernel, what Ring-mode is user-land?


https://en.wikibooks.org/wiki/Windows_Programming/User_Mode_vs_Kernel_Mode



What is the problem with Windows LM hashes?


https://en.wikipedia.org/wiki/LAN_Manager#Security_weaknesses


https://duo.com/blog/password-palpitations-the-ongoing-threat-of-lm-hashing


https://docs.microsoft.com/en-us/troubleshoot/windows-server/windows-security/prevent-windows-store-lm-hash-password


https://docs.microsoft.com/en-US/troubleshoot/windows-server/windows-security/prevent-windows-store-lm-hash-password



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