• Administering network infrastructure, keywords:

TCP/IP, OSI;

*/*TP (Cat. 5-7), Fiber (Singlemode, Multimode);

Ethernet, speed, duplex, autonegotiation, MAC, unicast, broadcast, VLAN, access, trunk, 802.1Q, EtherChannel (PAgP, LACP), *STP (bridge ID, BPDU, port roles & states, cost, timers, portfast), port security, DHCP Snooping, Dynamic ARP Inspection, CDP, LLDP, NAC, 802.1x, LAN topologies, campus LAN, 3-tier, 2-tier, SOHO, PoE;

Wireless, BSS, DS, ESS, IBSS, bands & channels, BSSID, SSID, 802.11*, WLC, AP, autonomous AP, WPA, WPA2-3, NAC, 802.1x;

IPv4, addressing & subnetting, classful, classless, VLSM, CIDR, ARP, ACL, NAT, FHRP;

IPv6, prefix, global unicast, unique local, link local, EUI-64, multicast, multicast scope, anycast, NDP (RP, RA, NS, NA), SLAAC, ACLv6, NAT64;

Routing, routing protocols, routing table, administrative distance, metric, OSFP, BGP;

GRE, DMVPN, IPsec, WAN;

TCP, UDP, ports, sequence number, acknowledgment number, window size, flags (SYN, ACK, RST, FIN, etc.), options;

DHCP, DNS, NTP, HTTP, SSL/TLS, SSH, syslog, FTP, TFTP, SNMP.

• Administering VMWare vSphere, keywords:

ESXi, vCenter server, SSO, vSS, vDS, VMkernel Ports, LUN, iSCSI, VMFS, NFS, VMs, vApps, DRS/HA clusters, FT, Resource Pool, vMotion.

• Administering Linux-based OSes, keywords:

User and group management, permissions & ownership management, networking (NetworkManager, systemd-networkd), managing software, (rpm, yum, dnf, apt, pacman) managing processes (init, systemd), scheduling tasks (cron, systemd.timer, at) configuring logging (rsyslog, jorunald), managing storage (MBR, GPT, ext4, XFS, swap, fstab, LVM, mdadm, hard links, symbolic links), SELinux, firewall (iptables, firewalld).

• Configuration management with Ansible, keywords:

inventories, patterns, playbooks, host & group vars, roles, collections, modules, tags, loops, blocks, vault, privilege escalation.

• Backup and replication with VEEAM, rsync.

• Monitoring with Zabbix.