Tech Docs
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An OSPF default route tells routers where to send traffic when no more-specific route matches a destination. In a campus or data center, an edge router can originate a default route into an OSPF domain, but engineers must confirm that the upstream path is actually usable. This lesson builds on OSNEC.001: OSPF Fundamentals and OSNEC.002:…
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OSDCEC.008 covers data center water systems: closed and open cooling loops, cooling towers, makeup water, blowdown, cycles of concentration, water quality, WUE, leak risk, and dry-cooling tradeoffs.
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OSSQL.002 teaches the SQL SELECT statement: result sets, select lists, choosing columns, SELECT *, FROM, expressions, duplicate values, row-order assumptions, and basic query reading.
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Learn a practical data-center server provisioning workflow: identity checks, BIOS/UEFI, storage and RAID, PXE or installation media, operating-system deployment, firmware and drivers, validation, documentation, and handoff.
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OSPHP.002 teaches PHP syntax fundamentals: PHP tags, statements, semicolons, echo, comments, whitespace, case sensitivity, short echo syntax, mixing PHP with HTML, and basic parse-error troubleshooting.
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A switch port is the physical and logical connection between an Ethernet switch and a network device. When a workstation, server, access point, or uplink fails, a technician should diagnose the port systematically before changing settings. This lesson follows OSNTC.020: Link Aggregation and LACP and revisits Ethernet Link Negotiation. LEARNING OBJECTIVES By the end, identify…
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OSHTML.001 introduces HTML document structure: DOCTYPE, html, head, body, character encoding, title, headings, paragraphs, nesting, browser inspection, and validation.
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OSPHP.001 introduces the PHP runtime: CLI execution, php -v, running PHP files, php -r, configuration, SAPIs, and PHP’s built-in development server.
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OSPowerShell.001 introduces PowerShell cmdlets: Verb-Noun naming, Get-Verb, Get-Command, Get-Help, Get-Process, command types, discovery, syntax, and safe first troubleshooting.
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OSBash.001 introduces Bash shell and script basics: terminals versus shells, shebangs, running scripts with bash, chmod +x, ./ execution, PATH behavior, and first troubleshooting steps.
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A PCIe retimer recovers timing and data from a degraded PCI Express signal, then retransmits a clean copy so high-speed devices can communicate across difficult electrical channels.
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OSC.001 introduces the C compiler toolchain: GCC, preprocessing, compilation, assembly, linking, object files, first builds, warnings, and basic troubleshooting.
