![Ticket#3 - VLAN Mismatch: End Users Unable to Reach Gateway – A Real Cisco Fix [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/07/nj-blog-post-Ticket3.jpg)
Problem Summary Multiple end-users on the 3rd floor raised a complaint that they were unable to reach the default gateway. They couldn’t access internal resources or the internet. The issue was isolated to a single switch block, while other floors remained unaffected. The NOC team […]
Problem Summary A ticket was raised from the IT Helpdesk reporting that critical application servers hosted in the data center VLAN 130 were not reachable. Multiple users across departments couldn’t access internal services or ping the application server IP 10.130.10.10. This seemed like a routing […]
![Ticket#1-Enterprise Slowness: High CPU on Core Switch – Step-by-Step Troubleshooting [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/07/nj-blog-post-Ticket-1.jpg)
Problem Summary A major enterprise customer reported intermittent slowness across multiple departments. Applications were taking longer to respond, voice quality degraded, and video calls were choppy. This issue seemed to affect users connected to different VLANs and floors. The complaint was urgent and escalated to […]
![The Ultimate IPv6 Troubleshooting Guide: Tools, Tips, and Labs [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/07/nj-blog-post-ipv6-troubleshooting-guide.jpg)
If you’ve ever been stuck with “Why isn’t my IPv6 ping working?”, then this blog is for you. Unlike IPv4, IPv6 brings new protocols, new behaviors, and new bugs, which means you need to troubleshoot with fresh eyes and fresh commands. Whether you’re preparing for […]
![Dual Stack vs Tunneling: Which IPv6 Transition Strategy is Right for You? [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/07/nj-blog-post-Dualstack.jpg)
If you’re reading this, you’re probably at that point in your IPv6 learning journey where the real challenge isn’t IPv6 itself—it’s the transition from IPv4. The world isn’t flipping a switch overnight. Most networks still run IPv4, and we need mechanisms to make IPv6 work […]
![Mastering IPv6 Routing: A Complete Guide with Labs, CLI & FAQs [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/07/nj-blog-post-IPv6-routing.jpg)
If you’re reading this, you’re either deep into the world of IPv6 already or you’re preparing to face it soon. IPv6 is no longer just a future plan—it’s the reality of today’s networks, especially with the exhaustion of IPv4. If you’ve ever wondered “How does […]
![Your First Step into IPv6: Address Types, Labs, CLI & Real-World Use Cases [CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/07/nj-blog-post-IPV6.jpg)
When I started teaching networking years ago, IPv4 was king. Subnetting was everyone’s nightmare (and still is ). But over time, I noticed a shift. Devices kept growing, IP conflicts became more common, and NAT started showing its limits. That’s when IPv6 really started to […]
![VPN 0 and VPN 512 in Cisco SD-WAN: Backbone & Management Explained[CCNP ENTERPRISE]](https://networkjourney.com/wp-content/uploads/2025/06/nj-blog-post-vpn0-vpn512.jpg)
Today diving deep into a very important, yet often misunderstood part of SD-WAN architecture — VPN 0 and VPN 512. When you start exploring Cisco SD-WAN (Viptela), you’ll quickly notice the use of different VPNs not just for end-user data, but for control, management, and […]
![Performance Routing (PfR) Basics: Optimize Traffic Like a Pro [CCNP ENTERPRISE] networkjourney](https://networkjourney.com/wp-content/uploads/2025/06/nj-blog-post-PFR.jpg)
Today’s article, we’ll dive into one of the most powerful yet underrated features in enterprise networks — Performance Routing (PfR). While traditional routing protocols like OSPF or BGP make decisions based on shortest path or metrics like cost, PfR goes beyond. It chooses the best […]
![Hub-and-Spoke in Modern WANs: Still Relevant in 2025?[ccnp enterprise]](https://networkjourney.com/wp-content/uploads/2025/06/Slide1.jpg)
Today we’re going back to one of the core building blocks of WAN design — the Hub-and-Spoke topology. Even in today’s era of SD-WAN and cloud-first networks, the hub-and-spoke model remains relevant, especially for centralized security, legacy MPLS, and hybrid branch setups. Whether you’re starting […]
