Operating systems:
UNIX, LINUX, Rhel, Debian, Arch, CISCO IOS., MS: DOS, 9X, ME, NT, XP, Vista, 2003/2008 Server
Applications:
CISCO: UCCE, CUCM, UCCX, Script Editor, UNITY. Docker, git, Ansible, Kubernetes, SVN. Syslog, PRTG, sssd, krb5, LDAP FreeSWITCH, Asterisk, FreePBX, iptables, Fail2ban, OpenMeetings, Proxmox, ORTS, OPENNMS, PFSense, Apache, LAMP, CorelDraw, MS Office, Yed, Facebook, Linkedin Google- API
Programming languages:
ANSI C, php, SQL, cgi, Java, Android SDK, javascript, C++, dotNET C#, VB6, Action script, Object ADA, Bourne Shell, C Shell and other script languages, shells and interpreters.
Networks:
ISO OSI, L2/L3, ARP, TCP/IP, subnetting, VLAN, WAN, CISCO: NAT, L7 routing, CoS QoS, ACL, IPSec, SSL
Others:
Excellent documentation skills. Good at training users and coordinating people in projects.