Cisco Software Engineer interview questions

Interview process was good .HR executives were very friendly. First Round was written round . It consisted of 4 sections C programming mailnly linux /process/fork etc English Aptitude 1 C program 2nd round was F2F technicle lasted for 50 minutes asked basic bit operations , IPC mechanisms /Linked list programs ,Memory allocation etc 3rd Round was Again F2F asked to implement memcpy 4th round was HR enquired about previous hike, expected salary and Personal Details etc Asked to send Salary details ASAP. But i was never contacted . After sending gentle email also i didn't get any Reply.I didnt get Rejection Mail also. After somedays my friend working there contected and updated me that i was not selected