• Virtualization and containerization: VMware vSphere (HA, DRS, vMotion, vSAN, VDI, vApp), Hyper-V (clustering, Live Migration), Proxmox VE (HA, LXC, vzdump), KVM, Docker
• Networking (Cisco, Mikrotik): VLAN, VRRP/CARP, OSPF, NAT, ACL, QoS, VPN, Proxy, RADIUS, Wireshark
• Security (CheckPoint, Kaspersky): NGFW, IDS/IPS, SIEM/VM, DLP, EDR, TLS
• Infrastructure services:
• Windows: Active Directory, DHCP, DNS, CA, Trust, GPO, MS Exchange, Veeam Backup, NFS
• Linux: FreeIPA, LVM, cron, systemd, firewall, syslog, SSH, LAMP, Nginx
• Cloud (AWS, Azure, Yandex Cloud): VPC, S3, VM, ACL, IAM, Resource Groups
• Automation & IaC: Bash, PowerShell, Terraform
• Monitoring (Zabbix, Grafana, PRTG): triggers, custom templates, alerts, dashboards, sensors, reporting
• DataBases (PostgreSQL, MySQL, Redis): configuration, backup/recovery, tuning, SQL queries
• Hardware (Lenovo, HPE, DELL): iLO, iDRAC, XClarity, firmware updates, RAID