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Topic, concept or certificationTry DNS, identity or SC-900.

Lesson · AI & Agent SecurityAI and agent securityUnderstand models, retrieved context, tools, identity and authority before studying prompt injection.
Lesson · DNSDNS names, hierarchy and record typesBuild the vocabulary needed to read a DNS answer without confusing names, zones, servers and records.
Lesson · DNSDNS resolution, referrals and cacheTrace a recursive lookup and learn where cache changes the path.
Lesson · DNSDNS tools and Wireshark inspectionUse DNS commands deliberately and learn how to inspect a query and response in Wireshark.
Lesson · DNSDNS troubleshooting and security boundariesDiagnose failures one boundary at a time and distinguish DNSSEC, encrypted DNS and DNS abuse.
Lesson · Computer foundationsFiles, folders and pathsUnderstand named stored data, containers for names and the route to one item.
Lesson · Network foundationsGateway and routerFollow a non-local packet through the default gateway and connect the logical path to real office equipment.
Lesson · Identity foundationsIdentity, authentication and authorizationSeparate identity from proof and permission, then place providers, directories and federation in the flow.
Lesson · Computer foundationsWhat a computer doesSeparate processing, working memory, storage and input/output before learning files or commands.
Lesson · Network foundationsIP addresses and local networksRead an interface address and prefix, then decide which destinations belong to the local network.
Lesson · Network foundationsWhat a network connectsRecognise devices, interfaces, links, clients, servers and packets before reasoning about addresses.
Lesson · Computer foundationsProgram and processSeparate stored instructions from a running instance with memory, identity and permissions.
Lesson · Security and compliance foundationsSecurity and compliance foundationsLearn the language of assets, threats, risk, controls, shared responsibility, defense in depth, Zero Trust and GRC.
Lesson · Terminal and commandsNavigate and change virtual stateUse the current directory, paths and small reversible changes inside the safe simulator.
Lesson · Terminal and commandsTerminal, shell and commandDistinguish the window, the command interpreter and the instruction you type.
Topic · Digital foundationsComputer foundationsComputers, files, folders and processes as the vocabulary needed before terminals and networks.
Topic · Digital foundationsTerminal and commandsTerminal, shell, command, current directory and the first safe filesystem observations.
Topic · NetworkingDNSName resolution, records, caching, commands and the trust boundaries around DNS.
Topic · Operating systemsLinux shellShell vocabulary, paths, standard command patterns and safe observation in Linux.
Topic · Operating systemsPowerShellCmdlets, objects, providers and observable administrative workflows.
Topic · AI and agent securityAI & Agent SecurityLLMs, retrieved context, agents, MCP and the security boundaries between them.
Topic · NetworkingNetwork foundationsInterfaces, addresses, packets, routes, transport ports and client/server roles.
Topic · Security architectureSecurity and compliance foundationsAssets, threats, vulnerabilities, risk, controls, shared responsibility, defense in depth, Zero Trust and GRC.
Topic · Identity and accessIdentity foundationsIdentity, authentication, authorization, identity providers, directories and federation.
Command · Terminal and commandspwdPrint the current directory.
Command · Terminal and commandslsList names in the current directory.
Command · Terminal and commandsmkdir labCreate a directory in virtual state.
Command · Terminal and commandstouch note.txtCreate an empty simulated file.
Command · DNSnslookup example.testAsk a configured DNS server for information about a name.
Command · DNSdig example.test AInspect a DNS query and its returned sections with a query-oriented tool.
Command · DNSResolve-DnsName example.test -Type AResolve a name with the Windows DNS client cmdlet and request a record type explicitly.
Command · DNSipconfig /displaydnsDisplay the contents of the Windows DNS client resolver cache.
Command · DNSGet-DnsClientCacheDisplay entries in the Windows DNS client cache.
Command · DNSClear-DnsClientCacheClear the Windows DNS client cache without producing success output.
Command · DNSipconfig /flushdnsFlush the Windows DNS client resolver cache.
Command · DNShost -t AAAA example.testPerform a compact DNS lookup for an explicitly selected record type.
Command · DNSping example.testObserve simulated name resolution followed by an ICMP reachability check; it does not prove application health.
Command · Linux shellpwdPrint the current directory.
Command · Linux shelllsList directory entries.
Command · Linux shellcd notesChange the current directory.
Command · Linux shellcat notes/dns.txtRead the simulated text file in Command Lab.
Command · PowerShellGet-LocationShow the current location.
Command · PowerShellGet-ChildItemList items at a location.
Command · PowerShellGet-Content notes/dns.txtRead content from the simulated file.
Command · PowerShellGet-ProcessInspect the simulator's process fixture.
Command · Network foundationsipconfigInspect the simulated interface configuration.
Command · Network foundationsip addressInspect the simulated Linux interface and address.
Command · Network foundationsping 192.0.2.25Run a simulated ICMP reachability observation.
Document · DocumentsDNS Foundations Study GuideA project-authored guide to names, resolvers, records, caching, commands, troubleshooting and the boundaries of DNS security.
Document · RFC EditorRFC 1034 — Domain Names: Concepts and FacilitiesThe normative DNS concepts reference used to verify the platform's original explanations. It remains on the official RFC Editor site.
Document · Wireshark FoundationWireshark User's GuideThe official current interface and workflow reference. The platform links to it instead of storing an unverified local copy.
Document · MicrosoftOfficial SC-900 Study GuideMicrosoft's current exam-objective reference. It verifies scope but does not replace the platform's own lessons.
Path · LearnPathsContent is intentionally labelled planned, draft, review or verified.
Path · LearnTopicsCanonical topic destinations with lessons, commands, labs, visuals, relationships and sources
Certification · CertificationsCertificationsSC-900 SC-200 SC-300 SC-500 SC-100 OSCP CISSP CISA CISM
Lab · LabsCommand LabPractice safe, deterministic CMD, Linux and PowerShell commands in a virtual filesystem.
Visual · VisualsVisualsDNS, protocols, architecture and learning relationships
Document · DocumentsDocumentsProject-authored guides and rights-aware official references
Path · LearnMapOpen the complete map
Path · PathsDefensive / BlueTelemetry, detection, response and recovery
Path · PathsOffensiveAuthorised testing, analysis and reporting
Path · PathsGermany / GRCISO 27001, BSI IT-Grundschutz and evidence

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Learn Cybersecurity v0.6-wayfinding · working name · static-first