Coding Interview practice with questions from different sources:

• Careercup
• Pramp
• InterviewBit
• Glassdoor
• StackOverflow
• Cracking the Coding Interview (5th Edition)
• Cracking the Coding Interview (6th Edition)
• Programming Interviews Exposed (3rd Edition)
• geeksforgeeks
• HackerRank
• Quora

The knowledge based section (and content) includes some exercises adapted from:

• Advanced Programming in the UNIX Environment (3rd Edition)
• UNIX and Linux System Administration Handbook (4th Edition)
• The C Programming Language (2nd edition)
• Computer Networking: A Top-Down Approach (6th Edition)
• TCP/IP Illustrated, Volume 1 (2nd Edition)
• The awk programming language
• The Practice of Programming