Palo Alto Networks Network/Security Engineer interview questions

First was a basic HR round followed by two telephonic rounds. They asked basic questions like: 1) steps on server and client side while creating a TCP socket. 2) how collisions happen in a Hash map.. how u avoid it.? 3) how will design your own hash function 4) All Projects mentioned on Resume. After clearing this i was called on-site. There i had 10 rounds with two teams. all questions were to code in C only: 1) Implement your own malloc and modifications on that like reallocate same memory again. 2) implement LRU in O(1) lookup time. 3) trie data structure 4) detect a loop in a linked list 5) remove white spaces from a string without any extra space 6) return k largest integers in an array. 7) linux command to know your default gateway 8) implement spin lock in C 9) Implement ager game