1. Good knowledge in Linux 9/8 (Red Hat/CentOS), Windows server 2. Understanding of Bash/Shell Scripting.3. Knowledge of OSI Model, DNS, TCP/IP, DHCP, IPv4-Subnetting, Routing, switching, RIP, OSPF, EIGRP protocol4. LINUX:- >User & Group management ( explicit permission on command, SUDO, password management, and more..) >Filesystem management >ACLs >SELinux ( identify an error, assign proper field context, port, and more.. ) > Network and security, Firewall > Running process, memory space, local storage monitoring. >Tunning of the kernel, kernel update, and package management > OS patching, booting process, recovery ( password, data ) >SSH configuration, Cronjob( recurring task) >Storage management ( LVM, RAID(0,1,10),VDO, ) >SWAP management ( create, delete, scaling) >Log management ( persistent storage, reading logs, identifying errors) > Container (docker) image, create, run and manage. >NFS server ( Configure, Automount, Permission issues)5. Understanding of ANSIBLE, writing PLAYBOOK, MODULES, ROLES.6. AWS services - Compute, Networking, Storage, IAM Policy, Roles, Management Tools7. Good troubleshooting and analytical skills.