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OPTINOC

Technical resources

Original optics, documented by reference.

Buying guides, technical notes and manufacturer-reference resources for professional optical links.

Editorial scope

SFP through QSFP-DD · original manufacturer references · selection boundaries · procurement context

All resourcesBuying guidesTechnology & ArchitectureNetwork glossaryNews & TrendsBrand guidesIndustry use casesComparisonsDatasheetsFor network engineersFor CIOs & IT decision-makers
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Network glossary

What Is DNS? How the Domain Name System Works

What is DNS? Definition, hierarchy, records, resolution chain, DNSSEC, and DoT/DoH.

April 15, 2026

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Network glossary

What Is a Firewall? Definition, Operation, and Firewall Types

What is a firewall? Definition, types (NGFW, WAF), functions, and leading vendors in 2026.

April 15, 2026

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