First Stage is Recruiting Second stage is for example Technical Itnerview which consists many tech questions Than you will have alos Manager's Itnerview where you should use soft skills and so on. so in General Interview is quit interesting

I got my interview call via employee referral. Two rounds of technical and one round Managerial First round was telephonic . Be careful of what you mention in your resume . That becomes your syllabus. SIP protocol details and call flow. (I had VOIP mentioned in my resume , so was asked to pick protocol I am most comfortable in) DNS doctoring Path MTU in TCP Fragmentation What happens when a new switch comes up in a network If a old firewall has been replaced with new one and internet stops working after that , how do you troubleshoot Some more questions which I dont remember now. Then Second round was video conference. Tell something about yourself and work you have been doing Describe Quality of Service SSL handshake in detail GRE tunnel. FTP and its modes What happens with active and passive ftp with nat and /or security policy. how do you block facebook on firewall over https. What aproaches can be used. Brief description of bgp , how are ebgp and ibgp different , how will you implement security in BGP Authentication in BGP and done at what layer Garp and rarp. is rarp used today . what is used instead dhcp relay working These are related to what I mentioned in my CV. Managerial is simple.