QoS
Why Facebook Runs BGP Everywhere — Even Inside Its Data Centers
An in-depth technical look at Facebook's network infrastructure, including routing protocols, open-source switching, and security architecture, with practical insights for network engineers.
What a Cosmetic Box Actually Does at the Packet Level
A cosmetic box network policy improves the appearance of performance or compliance without fixing the underlying infrastructure problem. This guide explains how these configurations work at the packet level, how to build them, and — more importantly — how to detect and replace them. Engineers preparing for CCNP or CCIE will find the CLI examples and audit techniques directly applicable to both the exam lab and production environments.
Where Bandwidth Lives in the Routing Table Decision
Bandwidth metric underpins routing decisions and QoS guarantees. This article covers EIGRP composite calculation, OSPF cost, BGP limitations, and CLI troubleshooting — essential for CCNA through CCIE.
How to Build Edge Network: Complete 2026 Guide
Master building edge networks with step-by-step instructions, case studies, and 2026 stats. Reduce latency by 60% and scale for IoT success.
How Smart Blinds Connect to Your Network: Protocols and Topologies
A network engineer's guide to deploying smart Windows Blinds: VLAN isolation, QoS policies, and security considerations.
Some Cosmetic Box Ideas That You Can Share With Your Friends
The Tier 1 NOC engineer stared at a dashboard showing 94% interface utilization on the core switch stack. The immediate fix was a QoS policy that rate-limited Instagram and TikTok traffic to 2 Mbps per user. The executive team praised the “network optimization.” In reality, nothing was optimized — the congestion merely became less visible...
Delay Metric: How Routing Protocols Actually Use It
Delay measures the time it takes for a packet to traverse a path, and it plays a very different role depending on which routing protocol is doing the measuring. EIGRP weighs delay directly in its composite metric by default. OSPF’s cost calculation, by contrast, is purely bandwidth-based and doesn’t factor in delay at all. This...
Bandwidth Metric: How Routing Protocols and QoS Use It
A network engineer stares at a traceroute that defies logic — traffic flows across a 10 Mbps satellite link while a 1 Gbps fiber path sits idle. The root cause isn’t a hardware fault. It’s a misconfigured bandwidth metric. Across every major routing protocol and QoS framework, the bandwidth metric quietly dictates which path packets...