Technical Interview Questions Network/Security Jobs

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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