#network-engineering

F1-U flow control: how a 5G base station’s two halves stay in step

In 5G, the gNB is not a single box. Under the 3GPP higher-layer split (TS 38.401), a Central Unit owns the upper radio-protocol layers, and…

Validate Before You Build: Don’t Waste a Month on the Wrong Idea

5–10 conversations beat 100 assumptions

Stop Writing Fragile SSH Scripts: Scaling Cisco Network Automation with Python and Nornir

Moving beyond sequential loops: A production-ready approach to inventory management, concurrency, and state validation.

The Great Postal Service of Wall Street: Building Project Chimera (Phase 1)

How I designed and deployed a self-healing, global enterprise network for a hypothetical $50B financial firm.

Architecting a Carrier-Grade MPLS Backbone for CRTV: A Multi-Site L3VPN Implementation

When managing the digital infrastructure for a national broadcaster at Cameroon Radio Television (CRTV), the network is more than just a…

The Ping Worked. The Route Was Missing.

What an H3C S6500 ECMP incident taught me about one of the most dangerous assumptions in Layer 3 troubleshooting: reachability does not…

Repeater (রিপিটার) আসলে কী এবং কীভাবে কাজ করে?

একটি পানির পাইপের কথা চিন্তা করুন তো! কল থেকে অনেক লম্বা একটা পাইপ দিয়ে বাগানে পানি দিতে গেলে কী হয়? পাইপের শেষ মাথায় গিয়ে পানির স্পিড একদম…

Why “It Works” Isn’t Proof It’s Safe

The happy-path trap almost every vibe coder falls into — usually once, the hard way

Git & GitHub for People Who’ve Never Touched a Terminal

Version control isn’t a developer skill. It’s your undo button.

9 Racks, 27 kW, and One 25-Meter Surprise: The Site Survey That Changed Our -48V Power Design

A real Magyar Telekom IPTV data-center project taught me why a design is not finished until the cable route has been measured in the actual…

What Actually Happens When You Send Data Across a Network?

Using the OSI model as a practical mental model for encapsulation, routing, transport, and debugging.

At Carrier Scale, DNS Forwarding Becomes a Routing Problem

Why source IPs, return paths, BGP and the separation of control plane from DNS processing matter more than they first appear

RDMA — The Secret Network Behind AI Supercomputers [Article 5]

RoCEv2 and InfiniBand — The Networks Powering AI Supercomputers

Enterprise Software Development That Powers Digital Transformation

In a rapidly evolving digital economy, enterprises need powerful, adaptable systems that drive efficiency and innovation. Off-the-shelf…

The Xn procedure that fetches a sleeping UE from another gNB

5G gave the RRC state machine a third state. Between IDLE and CONNECTED sits RRC_INACTIVE: a UE with no traffic gets *suspended* rather…

Building a Reverse Proxy : My learnings

Discussed below are some of the concepts I explored while building a Reverse Proxy: Including proxies, load balancing, health checks, rate…

Cisco Webex UCCE Contact Center Training: Build Enterprise Contact Center Skills

Cisco contact centers continue to play a vital role in delivering exceptional customer experiences across industries. As organizations…

Building a Self-Healing Egress Architecture for AWS Local Zones

Using AWS Transit Gateway Connect, GRE, and FRRouting to eliminate a single point of failure.

Why Does LTE Need the Random Access Procedure?

Every time your smartphone powers on, moves into a new cell, or reconnects after losing coverage, it must first establish communication…

The Hidden Logic of Networking #1: Why Does a Computer Need a MAC Address if It Already Has an IP…

When I first started learning networking, I thought I understood the basics.

Mastering Cisco IOS Command Modes

Cisco IOS (Internetwork Operating System) uses a hierarchical command-line interface (CLI) structure to organize administrative tasks by…

Demystifying the Core Protocols of a Flat LAN

CISCO NETWORKING FOUNDATIONS LAB HANDBOOK

The Hidden Impact of Poor Network Rack Cabling on Business Performance

Most people only think about a network when something goes wrong. Slow internet, disconnected devices, server communication issues, and…

Why Your VoLTE Quality Score Is Lying to You

Your VoLTE dashboard shows MOS 4.0. Your QoE report says “excellent.” Your users are hanging up after 12 seconds. Something does not add…

Enterprise Monitoring: Upgrading Zabbix Infrastructure and Integrating Cisco 9800 WLC SNMP…

Managing an enterprise network infrastructure requires absolute visibility. When you are responsible for monitoring hundreds of switches…

Telecom Services and 5G Network Optimization in Texas, USA

Texas has emerged as one of the leading telecommunications and technology hubs in the United States, driving rapid growth in digital…

How Does the Internet Know Your Download Isn’t Corrupted?

You wait 20 minutes for a large software update to finish downloading.

CCNA: A Beginner’s Guide to Starting Your Networking Career.

If you want to build a career in IT but don’t know where to start, CCNA might be the best first step.

Structured Intelligence: A Universal Artifact Schema for AI-Assisted Network Troubleshooting

Technical Architecture · Network Automation · AI-Assisted Operations CI/CD · Network Observability · AIOps

Kurumsal Ağlarda Yönlendirme Stratejileri: EIGRP ve OSPF Teknik Analizi

1.Giriş: Dinamik Yönlendirme Protokollerinin Mimari Önemi

Engineering a CCNP-Level VRF & BGP Security Topology with 2 Cisco 3850 Switches

How I Built a Production-Grade Enterprise Network in EVE-NG

When Cisco Packet Tracer Isn’t Enough for Advanced Networking Labs

This is one of method how to build your own network labs

Day in the Life of a Field Service Engineer working in Telecom

Working as a field engineer often means responding to unexpected alarms from telecom sites. Monitoring systems are designed to detect…

Setting Up Akvorado: A NetFlow Analyser for Your IPv6-First Network

Tags: IPv6, Network Engineering, NetFlow, Akvorado, Docker, MikroTik

From “Hello World” to “Agent Ready”: Why We Built Instead of Bought

Last month i shared a screenshot of a single switch validation. 12 tests. 1.46 seconds. It was cool but it was a toy example.

The Network Lab Revolution: 5 Game-Changing Secrets of Cisco Modeling Labs (CML)

For years, network engineers have faced the “lab wall.” To master enterprise-grade architectures or test the latest software, you either…

From Clicking to Control: RBAC as the Backbone of the F5 XC Console

In my last post, Getting to Clicking: Understanding the F5 XC Console, I focused on how the F5 Distributed Cloud (XC) console adapts itself…

Zero Trust for Network Engineers: Practical Implementation Beyond the Buzzword

A Network Engineer’s Guide to Applying Zero Trust in Modern Infrastructure

Part 4 — Per-Entity Baselines + Model Persistence (So Your Mini IDS Actually Learns)

Part 3 got you to a deployable pipeline: flow logs in, anomalies out, JSON events shipped.

Part 2 — From “Anomaly Detected” to “Who Did What?” (Top Talkers + Context + Live Mode)

In Part 1, you built the core mini IDS: parse traffic → window it → extract features → baseline → flag anomalies.

Python-Powered Traffic Anomaly Detection: A Mini IDS for Network Engineers

Build a lightweight, practical anomaly detector from scratch — capture packets, extract signals, baseline “normal,” and alert on the weird…

Cisco Warranty Check: Lessons I Learned the Hard Way

Learn how to check Cisco warranty, verify device coverage, and understand SMARTnet for reliable network management.

The Real Bottlenecks in Rapid FTTH Home Activation

In many FTTH projects, the core network is ready, splitters are in place, and backbone tests look clean — yet home activations still feel…

Wall-Mounted vs Compact FTTH Terminal Points: Which Works Better in MDUs

In many MDUs, technicians hand over a “clean” FTTH build — labels are correct, power levels are within spec, and the hallway looks tidy. A…

Why G.657 Fiber Is Now the Standard for Complex FTTH Paths

A contractor can follow every step of the FTTH playbook and still get a call the next day: “WiFi is slow again.” The light levels looked…

The Role of Fiber Routing Discipline in FTTH Multi-Unit Buildings

In many multi-unit buildings, the fiber doesn’t fail at the splice tray or the OLT — it fails in the stairwell.  Technicians open a riser…

How Outdoor Cables Survive UV, Moisture, and Temperature Shifts in FTTH Last-Mile Networks

FTTH drop cable hanging between poles can look perfect on the day you finish the job. A few months later, after a heat wave and a week of…

Network as Code: Git, Branching, and PRs for Network Engineers

How to Leverage Git, Branching, and Pull Requests to Modernize Network Engineering Practices

[Home Lab] ลาขาด ISP Router สร้าง Home Network คลีนๆ ด้วย Mikrotik + XPON Stick

Network Geek อย่างเราๆ การเห็นเราเตอร์ตัวใหญ่เทอะทะของ ISP วางขวางทางลม แถมยังทำ Bridge Mode แล้วกินที่กินไฟ มันช่างขัดใจเหลือเกิน