What is Raid, difference between Raid4 and DP and how parity information calculated in case of drive failure. What is snap mirror and how does it work and what are the steps you follow in case of disaster recovery and why. Difference between snap mirror and snap vault and give example and situation where you would like to use snap mirror instead snap vault and snap vault instead snap mirror. Host communication with CIFS,NFS & ISCSI, draw a diagram with step by step communication establishment between client and server with each protocol. What is DNS, different DNS records, is DNS run on udp or tcp. Difference between udp and tcp. Explain in nutshell the advantage of tcp and udp. What are the authentication protocol NAS use to communication with AD in a typical AD & NAS integration environment. How do you troubleshoot performance issues with different protocol (CIFS, NFS & ISCSI) . What are the tools you would use to measure the performance of CIFS or NFS shares in a complex environment. What is soft zoning & hard zoning, how do you find a node information in a fabric. How do you upgrade switch firmware and different methods to upgrade firmware.
