Prepare for following in depth:- Networking: • Difference between router, switch. • What is a Broadcast Domain? • DHCP DORA process • DNS – detailed explanation. TCP/UDP and why? • Subnetting • MSS/MTU • Complete flow when you trigger amazon.com • OSI model with complete details and protocols on each layer. • TCP and SSL handshake • Difference between TCP/UDP, examples • Flow/error control • What is a firewall, why do you need it? • OSI Model • Public IP , private IP , NAT • Suppose I have a brand new laptop and I wish to connect it to the internet. What should I do, and what shall happen in background before the laptop is connected to the internet? (Ans. Manually assigning IP address or DHCP and DORA procedure. They expect you to explain in depth about DHCP and DORA) OS: • OS boot process (Win/Linux) • Memory management ;Memory pages; Buffer and Caches • System date/time management, network time protocol • Managing Users and groups • File permissions • Managing software’s - installation, uninstallation, upgrade etc. • Managing system services and background processes • Remote management of a system - SSH, RDP etc. • Network protocols - FTP, HTTP (web servers), SMTP (mail server) • System automation - cron, batch jobs, windows startup tasks • Basic linux commands Troubleshooting: • System performance - CPU, DISK, memory and network • System Login issues • System booting issues • System logs Network connectivity issues They are concentrating on coding more and more. So practice simple scenarios like removing duplicate character from string or assigning values without third variable etc...
