Palo Alto Networks interview questions

Recruiter reached me on linked in and setup a phone interview with hiring manager. The phone interview was easy, mostly my background and prev projects. The main open ended question was, if you received a uC board and it was not working, walk through all the steps to debug, HW and SW, how you would debug UART They invited me for 4 hours of onsite interview next, with 5 people and one person from HR. The interviews were intense and all technical. All interviewers were polite and professional. Since I signed a paper I cannot provide exact questions. First interview, lots of C programming questions, mostly pointers, structs Second: I was given a datasheet of an I2C device and I was questioned how the device works and how to use it, write API… Third: lots and lots of C programming, strings, memory management, you should be pro in C to get all the answers, and some basic networking questions, router vs switch, VLAN Forth: with the manager, create a specific malloc function Fifth: doubly linked list, insertion, deletion, search, implementation in C, the interviewer did not know what is double pointer and where to use it!! Some of question about linux, kernel, mutex and semaphores Finally an HR person The reason I am giving a negative rating to this interview is that they never contacted me after onsite interview

Three round of interviews. First two rounds each 30 min. First round is generally conducted by HR with some basic set of questions like ARP, active passive FTP, TCP/IP , three way handshake, MAC AND ARP, why security firm, pay expectation. Second round is taken by the manager. It again has basic questions like TCP/Ip , ipsec, VPN , tcp v/s udp, some hr questions again. Final round has three rounds each taken by two pair of engineers and final by manager.