Linux / Beginner
Linux filesystem and core directories
Understand the purpose of /, /home, /etc, /var and /usr.
OPEN LESSON ↗OPEN LEARNING LIBRARY
Knowledge Base
Practical lessons for Linux, Cisco and MikroTik. Search by topic or filter by category.
Linux / Beginner
Linux permissions: chmod, chown and rwx
Read, write and execute permissions for files and directories.
OPEN LESSON ↗Linux / Intermediate
Manage services with systemd and systemctl
Inspect, start and enable Linux services.
OPEN LESSON ↗Linux / Advanced
LVM basics: PV, VG and LV
Understand Physical Volumes, Volume Groups and Logical Volumes.
OPEN LESSON ↗Cisco / Beginner
The OSI model: understanding its seven layers
Understand network communication through seven layers.
OPEN LESSON ↗Cisco / Intermediate
Cisco VLAN and trunk configuration
Create VLANs and configure access and trunk ports on a switch.
OPEN LESSON ↗Cisco / Intermediate
Inter-VLAN routing: router-on-a-stick
Configure communication between devices in different VLANs.
OPEN LESSON ↗Cisco / Advanced
OSPF: neighbor relationships and basic configuration
OSPF process, router ID and network statements.
OPEN LESSON ↗MikroTik / Beginner
MikroTik DHCP Server: initial configuration
Understand IP pools, DHCP networks and DHCP servers.
OPEN LESSON ↗MikroTik / Intermediate
MikroTik NAT and masquerade
Allow a LAN network to access the internet.
OPEN LESSON ↗Linux / Intermediate
Linux network diagnostics
Inspect networking with ip, ping, traceroute, ss and DNS tools.
OPEN LESSON ↗Cisco / Advanced
OSPF multi-area fundamentals
Understand Area 0, ABRs and hierarchical routing design.
OPEN LESSON ↗MikroTik / Beginner
Back up a MikroTik configuration
Understand the difference between binary backups and configuration exports.
OPEN LESSON ↗Linux / Beginner
Linux users and groups
Users and groups are central to access control in Linux. A process normally runs with a user ID (UID) and group IDs (GIDs).
OPEN LESSON ↗Linux / Intermediate
SSH: secure remote access
SSH provides an encrypted connection to a remote Linux host. The server needs OpenSSH Server installed and the sshd service runnin
OPEN LESSON ↗Linux / Intermediate
Inspect Linux disks and filesystems
Disk administration starts by identifying devices, partitions, mount points and available capacity. Always verify the target devic
OPEN LESSON ↗Cisco / Intermediate
Spanning Tree Protocol (STP) fundamentals
Redundant physical paths in Layer 2 switched networks can create loops. STP prevents Layer 2 loops by blocking some redundant path
OPEN LESSON ↗Cisco / Intermediate
Cisco ACL: standard and extended access lists
An Access Control List (ACL) permits or denies traffic based on IP addresses, protocols and ports. Cisco ACLs are processed top-do
OPEN LESSON ↗MikroTik / Intermediate
MikroTik Firewall Filter: input, forward, output
RouterOS firewall filter processes traffic through three main chains: input — traffic destined for the router, forward — traffic r
OPEN LESSON ↗MikroTik / Advanced
MikroTik Bridge VLAN Filtering fundamentals
MikroTik RouterOS bridge VLAN filtering provides Layer 2 VLAN segmentation similar to a switch. The configuration relies on PVID,
OPEN LESSON ↗The knowledge base is public. New lessons will be added based on hands-on learning, official documentation and practical testing.