Deleting a VLAN on a Cisco switch is a one-line command — but it has ripple effects that are easy to miss if you don’t understand what happens to the ports that were using it. This guide covers the straightforward case of removing a single VLAN, the more surgical approach of pulling a VLAN off... » read more
Every 802.1Q trunk link has exactly one VLAN that behaves differently from all the others — the native VLAN, whose traffic travels untagged. Left at its default setting, it’s also one of the more commonly overlooked security gaps in a switched network, and one of the most common causes of a trunk that looks “up”... » read more
Getting a VLAN running on a Cisco switch is usually the easy part — assigning a port, creating the VLAN, and confirming connectivity takes just a few commands. The harder parts show up later: understanding why VLAN IDs above 1005 behave differently, and diagnosing exactly why a device suddenly can’t ping across a VLAN it... » read more
Whether you’re segmenting a small office network or managing dozens of switches across an enterprise campus, VLAN configuration follows the same core logic everywhere — even though the exact commands and menus differ from vendor to vendor. This guide starts with the fundamental concepts, walks through a full Cisco CLI configuration step by step, compares... » read more
Passing the Cisco Certified Internetwork Expert (CCIE) Enterprise Infrastructure exam is one of the most significant milestones of my professional life. The CCIE is widely regarded as the most prestigious and demanding certification in the networking industry, and for good reason — the road to earning those four letters after your name is long, rigorous,... » read more
Cisco has officially launched one of the most significant overhauls to its certification portfolio in over a decade. Unveiled under the banner of “Learn with Cisco,” this sweeping transformation—taking full effect on February 3, 2026—reshapes how IT professionals earn, communicate, and build upon their Cisco credentials. From the rebranding of entire certification tracks to the... » read more
Introduction The Project Management Institute (PMI) has released a major update to the Project Management Professional (PMP)® Examination Content Outline (ECO). Effective July 2026, this new framework replaces the January 2021 version and signals a significant evolution in how PMI defines, tests, and values project management competence. Whether you are a seasoned PMP holder planning... » read more
To safeguard your rights and interests regarding course access, learning services, and after-sales support, effective January 1, 2026, all courses and related services provided by the Company shall be conducted exclusively through the Company’s officially designated service channels and paid only via officially designated payment accounts. 1. Official Service and Communication Channels The Company communicates... » read more
I’m thrilled to share that my wife and I have both officially passed the PMP exam on our first attempt! It was a challenging but incredibly rewarding journey. My wife achieved a perfect AT/AT/AT score, and I was right there with her, scoring AT/AT/T. As a project manager with over five years of experience, and... » read more