[Blind-sysadmins] Just an Intro and a question about computer security.

Hi, all.     I am currently a student studying at Northumbria University in the UK.  My degree is Ethical Hacking for computer Security and as part of the degree it heavily relies on security and pennitration testing using Linux and windows.  I am hoping to use this degree as a way to gain employment within the Sys Admin field.  Can anyone advise of the accessibility of Kali Linux or provide me with some idea of the accessibility of the applications used for network tasks?   thanks   Lexi