![DIA vs Centralized Breakout: Which Internet Access Model Is Right for Your SD-WAN Network in 2025?. [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/06/DIA-vs-Centralized-Breakout-Which-Internet-Access-Model-Is-Right-for-Your-SD-WAN-Network-in-2025_networkjourney.png)
If you’re currently designing or managing SD-WAN solutions, you’re probably facing one of the most critical architectural questions: Should you go with DIA (Direct Internet Access) or a Centralized Breakout model? Choosing the right internet access model can significantly impact your application performance, security posture, […]
![Ticket#12: High Packet Loss on WAN Link – Diagnosing QoS Misconfigurations [CCNP Enterprise]](https://networkjourney.com/wp-content/uploads/2025/07/Ticket12_High-Packet-Loss-on-WAN-Link-–-Diagnosing-QoS-Misconfigurations_networkjourney.png)
Problem Summary A branch office reported high packet loss and poor application performance over the WAN. The issue impacted VoIP calls, Citrix sessions, and file transfers, despite the link being stable. Symptoms Observed Example CLI Output: Root Cause Analysis On investigation, engineers found: Root Cause: […]
![Ticket#24: Routing Table Blackhole – Route Redistribution Loop Detected Between OSPF and BGP [CCNP Enterprise]](https://networkjourney.com/wp-content/uploads/2025/07/Ticket24_Routing-Table-Blackhole-–-Route-Redistribution-Loop-Detected-Between-OSPF-and-BGP_networkjourney.png)
Problem Summary An enterprise site experienced sporadic loss of connectivity to external services and some internal prefixes. The issue appeared after a change request to redistribute OSPF into BGP and vice versa at the WAN edge. Symptoms Observed Example output: Root Cause Analysis The team […]
![Ticket#25: Server Reachable via Ping but Not SSH – TCP MSS Clamp Missing on Firewall [CCNP Enterprise]](https://networkjourney.com/wp-content/uploads/2025/07/Ticket25_Server-Reachable-via-Ping-but-Not-SSH-–-TCP-MSS-Clamp-Missing-on-Firewall_networkjourney.png)
Problem Summary A remote branch server (e.g., 10.1.20.10) was reachable via ping, but users could not SSH or access HTTPS applications hosted on it. The server was behind a firewall that performed NAT and IPSec VPN termination. Symptoms Observed Root Cause Analysis On closer inspection, […]
![Wireless LAN Controller Architecture – A CCNP Deep Dive [CCNP ENTERPRISE]_networkjourney](https://networkjourney.com/wp-content/uploads/2025/07/Wireless-LAN-Controller-Architecture-–-A-CCNP-Deep-Dive-CCNP-ENTERPRISE.png)
If you’ve ever worked with enterprise Wi‑Fi, you know how vital a good controller architecture is. I remember troubleshooting a campus network where the WLC was overloaded and APs were floating—quite a nightmare! That’s exactly why today, we’re going to explore Wireless LAN Controller (WLC) […]
![Wireless QoS Settings – Prioritizing Your Wireless Traffic Like a Pro[CCNP Enterprise]_networkjourney](https://networkjourney.com/wp-content/uploads/2025/07/Wireless-QoS-Settings-–-Prioritizing-Your-Wireless-Traffic-Like-a-Pro-CCNP-Enterprise.png)
Have you ever found yourself streaming a video while your download crawls at a snail’s pace—or worse, voice calls keep breaking even with full bars of Wi-Fi? That’s not just bad luck; that’s a network without QoS! Today, we’re going to demystify a crucial concept […]
![Introduction to JSON & YANG – The Foundation of Network Automation [CCNP Enterprise]](https://networkjourney.com/wp-content/uploads/2025/07/Introduction-to-JSON_YANG–The-Foundation-of-Network-Automation_networkjourney.png)
You’ve probably heard the terms JSON and YANG thrown around in the world of network automation, but they might still feel like mysterious tech-jargon to some. Trust me—I was there too. In this post, I’ll walk you through what JSON and YANG really mean for […]
![REST API Basics for Cisco Devices – Automate Smarter, Not Harder [CCNP Enterprise]](https://networkjourney.com/wp-content/uploads/2025/07/REST-API-Basics-for-Cisco-Devices-–-Automate-Smarter_Not-Harder_networkjourney.png)
If you’ve ever felt overwhelmed jumping between CLI screens or manually configuring the same changes across dozens of Cisco devices—then it’s time we talk automation. Today, we’re diving into the REST API basics for Cisco devices, a game-changer for anyone looking to modernize their workflow. […]
![NETCONF vs RESTCONF – Choosing the Right Protocol for Network Automation [CCNP ENTERPRISE]_networkjourney](https://networkjourney.com/wp-content/uploads/2025/07/NETCONF-vs-RESTCONF-–-Choosing-the-Right-Protocol-for-Network-Automation-1.png)
Today I want to talk about something that every aspiring network automation engineer must know — the difference between NETCONF and RESTCONF. If you’ve been tinkering with Python scripts or exploring tools like Ansible and Postman, you’ve probably stumbled upon these terms. But here’s the […]
![Cisco DNA Center APIs – Automating the Network the Smarter Way [CCNP ENTERPRISE]_networkjourney](https://networkjourney.com/wp-content/uploads/2025/07/Cisco-DNA-Center-APIs-–-Automating-the-Network-the-Smarter-Way-1.png)
Today I want to talk to you not just about automation — but next-gen automation that’s transforming enterprise networks across the globe. If you’ve been managing networks manually or using traditional tools like CLI or SNMP, let me introduce you to the game changer: Cisco […]
