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Technology & Architecture
VRRP and HSRP: High-Availability Gateways
VRRP/HSRP/GLBP: gateway high availability, HSRP vs. VRRP, object tracking, and modern EVPN anycast gateways.
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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Technology & Architecture
LACP: Best Practices and Configuration
LACP 802.3ad: modes, load balancing, MC-LAG/vPC/MLAG, ESI-LAG EVPN, and Cisco/Juniper configuration.
April 15, 2026
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Technology & Architecture
STP and Its Variants: Loop-Free Design
STP/RSTP/MSTP/PVST+: loop-free design, PortFast, BPDU Guard, Root Guard, and the SD-Access alternative.
April 15, 2026
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Technology & Architecture
SASE Architecture: Design and Deployment
SASE architecture: SD-WAN + ZTNA + SWG + CASB + FWaaS + DNS Security, leading vendors, and TCO.
April 15, 2026
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Technology & Architecture
Network Segmentation and Microsegmentation
Macrosegmentation/microsegmentation: VLAN, VRF, NSX-T, Cisco ACI, Illumio, traffic mapping, and NIS2.
April 15, 2026
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Technology & Architecture
Network Redundancy and High Availability
HA redundancy: 99.99%-99.999%, hardware, LACP/MC-LAG, HSRP/VRRP, BGP multi-homing, geo-redundancy.
April 15, 2026
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Technology & Architecture
Data Center Design: Spine-Leaf vs. 3-Tier
DC spine-leaf vs. 3-tier: scalability, latency, resilience, sizing, super-spine, and SONiC disaggregation.
April 15, 2026
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Technology & Architecture
Zero Trust and ZTNA Architecture
ZTNA architecture: Zero Trust principles, comparison with VPN, SDP vs agent-based models, phased deployment, Zscaler/Prisma/Cloudflare.
April 15, 2026
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Technology & Architecture
MPLS: Multi-Site WAN Architecture
MPLS WAN architecture: L3VPN with VRF/RD/RT, L2VPN/VPLS, Segment Routing, Traffic Engineering, and FRR.
April 15, 2026
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Technology & Architecture
QoS: Prioritizing Critical Enterprise Traffic
Enterprise QoS: DiffServ DSCP, voice/video/ERP classes, LLQ, CBWFQ, WRED, WiFi WMM, and application-aware SD-WAN.
April 15, 2026
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Technology & Architecture
OSPF: Area Design and Best Practices
Enterprise OSPF design: areas, LSAs, stub/NSSA, route summarization, BFD, authentication, and troubleshooting.
April 15, 2026
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Technology & Architecture
BGP: Enterprise Configuration
Enterprise BGP configuration: eBGP/iBGP, path attributes, communities, BFD, RR, multi-homing, Cisco/Juniper.
April 15, 2026