Technical Competence: Can you explain the OSI model and its different layers? How would you troubleshoot a network connectivity issue between a client and a server? What is DNS, and how does it work? Describe the difference between HTTP and HTTPS. Can you explain the concept of virtualization and its benefits? What is a firewall, and how does it enhance security in a network? How do you ensure data backup and disaster recovery in an organization? What are some common security vulnerabilities in web applications, and how can they be mitigated? Explain the difference between symmetric and asymmetric encryption. How do you diagnose and resolve performance bottlenecks in a computer system?
