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Network glossary
What Is NAT? Network Address Translation
What is NAT? Static/Dynamic/PAT, NAT64, use cases, drawbacks, and IPv6.
April 15, 2026
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
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Network glossary
What Is QoS? Network Quality of Service
What is QoS? DiffServ, DSCP, classification, LLQ, WiFi WMM, and voice/video prioritization.
April 15, 2026
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Network glossary
What Is OSPF? Open Shortest Path First
What is OSPF? Link-state IGP, areas, LSAs, BFD, and fast convergence.
April 15, 2026
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Network glossary
What Is BGP? Border Gateway Protocol
What is BGP? Internet routing protocol, AS, path attributes, multihoming, and best practices.
April 15, 2026
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Network glossary
What Is ZTNA? Zero Trust Network Access
What is ZTNA? Zero Trust, core principles, comparison with VPN, SDP/Agent, and vendors including Zscaler and Palo Alto.
April 15, 2026
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Network glossary
What Is SASE? Secure Access Service Edge
What is SASE? Convergence of SD-WAN + ZTNA + SWG + CASB + FWaaS, vendors, and pricing.
April 15, 2026
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Network glossary
What Is SD-WAN? Software-Defined WAN Explained
What is SD-WAN? SLA-based path selection, multiple links, ZTP, vendors, and MPLS savings.
April 15, 2026
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Network glossary
What Is a Site-to-Site VPN? IPsec and Alternatives
What is a site-to-site VPN? IPsec, IKEv2, topologies, and 2026 algorithms explained.
April 15, 2026
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Network glossary
What Is EVPN? BGP as the Data Center Control Plane
What is EVPN? MP-BGP control plane, Type 1-5 routes, multi-homing, and data center applications.
April 15, 2026
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Network glossary
What Is VXLAN? Encapsulation and Operation
What is VXLAN? L2/L3 overlay, 16M VNIs, BGP EVPN, and spine-leaf data centers.
April 15, 2026
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Network glossary
What Is MPLS? Definition and Operation
What is MPLS? Label switching, L3VPN/L2VPN, Traffic Engineering, and comparison with SD-WAN.
April 15, 2026
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Comparisons
Cisco ISE vs FortiNAC: NAC Comparison
NAC (Network Access Control) comparison: Cisco ISE vs FortiNAC. 802.1X, IoT profiling, TrustSec vs Security Fabric. Which NAC should you choose?
April 15, 2026