Cisco Senior Software Engineer interview questions

had 10 hours of interview 5 hours each. questions were not difficult everything in the areas of data structures, OS fundamentals and c programming. Interviewed for development engineer and the its a 1:1 type interview where each interviewer spends 1 hr with me. They started asking C-programming questions the 2nd minute itself. all the interviewers are really nice and friendly, except one person who acted very weird, showing attitude as if Cisco is standing just because of him, working on his laptop, replying emails, saying "shoot..", come on.. etc etc . I did not had a mood to answer him.