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Tag: sagar dhawan

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Multicast Basics and PIM Overview – Smarter Traffic Delivery in Modern Networks [CCNP Enterprise]_networkjourney
  • Trainer Sagar Dhawan
  • Posted on July 10, 2025
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Multicast Basics and PIM Overview – Smarter Traffic Delivery in Modern Networks [CCNP Enterprise]

Have you ever wondered how a single video stream from one server reaches hundreds or even thousands of users without consuming all the bandwidth on your network? That’s where Multicast comes in—it’s like broadcasting but smarter! As a trainer, I often tell my students, “If […]

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Mastering DHCP Snooping and Binding Table: Secure Your Layer 2 Network Like a Pro [CCNP ENTERPRISE]
  • Sagar Dhawan
  • Posted on July 7, 2025
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Mastering DHCP Snooping and Binding Table: Secure Your Layer 2 Network Like a Pro [CCNP ENTERPRISE]

I’ve had this discussion countless times with my students — “What if someone plugs in a rogue DHCP server and hijacks the IP allocation process?” Trust me, this isn’t just a theoretical concern. In modern LAN environments like shared offices, college campuses, and enterprise floors, […]

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From Zero to Secure: 802.1X + MAB CLI Walkthrough with Labs[CCNP ENTERPRISE]
  • Sagar Dhawan
  • Posted on July 7, 2025
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From Zero to Secure: 802.1X + MAB CLI Walkthrough with Labs [CCNP ENTERPRISE]

I am going to simplify one of the most powerful port-based access control mechanisms in enterprise networking — 802.1X with MAB (MAC Authentication Bypass). When configured properly, it ensures secure access for both corporate-managed devices and non-802.1X-capable endpoints like printers, IP phones, or legacy hardware. […]

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How to Lock Down Cisco Switch Ports with Port Security (2025 Guide)[CCNP ENTERPRISE]
  • Sagar Dhawan
  • Posted on July 7, 2025
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How to Lock Down Cisco Switch Ports with Port Security (2025 Guide) [CCNP ENTERPRISE]

Today I’m breaking down a simple yet powerful security mechanism every network admin should understand — Port Security on Cisco switches. Whether you’re working on a small LAN setup or enterprise-grade infrastructure, enforcing MAC address-level access at the port can go a long way in […]

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Default Route Propagation – Your Gateway to the World [CCNP ENTERPRISE]_networkjourney
  • Trainer Sagar Dhawan
  • Posted on July 7, 2025
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Default Route Propagation – Your Gateway to the World [CCNP ENTERPRISE]

Today, let’s talk about something deceptively simple but absolutely mission-critical in enterprise routing — Default Route Propagation. You know, in my CCNP classes, I often start the routing discussions with: “What happens when a router doesn’t know where to send a packet?” And the answer […]

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Administrative Distance Chart – Explained with CLI, Lab, Use Cases & FAQs [ CCNP ENTERPRISE ]_networkjourney
  • Trainer Sagar Dhawan
  • Posted on July 4, 2025
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Administrative Distance Chart – Explained with CLI, Lab, Use Cases & FAQs [CCNP ENTERPRISE]

If you’re diving into routing protocols or just wrapping your head around how your router picks the “best” path, you must understand the concept of Administrative Distance (AD). Think of AD like trust levels among friends. You’ve got friends (routing protocols) like OSPF, EIGRP, RIP, […]

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PBR Configuration with Match Statements [ CCNP ENTERPRISE ]_networkjourney
  • Trainer Sagar Dhawan
  • Posted on July 4, 2025
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PBR Configuration with Match Statements [CCNP ENTERPRISE]

Ever found yourself in a situation where you wanted to override the default routing decisions of your router? Maybe route specific traffic over a particular WAN link? That’s where Policy-Based Routing (PBR) becomes your best friend. In my experience training hundreds of engineers, I’ve seen […]

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Route Redistribution with Tagging – Mastering Controlled Routing Across Protocols [ CCNP ENTERPRISE ]_networkjourney
  • Trainer Sagar Dhawan
  • Posted on July 4, 2025
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Route Redistribution with Tagging – Mastering Controlled Routing Across Protocols [CCNP ENTERPRISE]

Today we’re diving deep into a topic that often haunts network engineers during real-world implementations and certifications like CCNP or CCIE — Route Redistribution with Tagging. I still remember a consulting project where a simple redistribution misstep created routing loops and service disruption across multiple […]

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BGP Prefix Filtering – Control What You Advertise and Accept [ CCNP ENTERPRISE ]_networkjourney
  • Trainer Sagar Dhawan
  • Posted on July 4, 2025
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BGP Prefix Filtering – Control What You Advertise and Accept [CCNP ENTERPRISE]

One small misstep in BGP advertisement can lead to a network disaster — and yes, it has happened to many top companies (some even made the news!). That’s why today, we’re talking about a life-saving skill: BGP Prefix Filtering. I still remember an incident where […]

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BGP Path Attributes Table – The Backbone of BGP Decisions [ CCNP ENTERPRISE ]
  • Trainer Sagar Dhawan
  • Posted on July 4, 2025
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BGP Path Attributes Table – The Backbone of BGP Decisions [ CCNP ENTERPRISE ]

Back in my early networking days, I thought BGP worked like OSPF or EIGRP — throw in some networks, and magic happens. But as I dug deeper, I realized BGP is a policy-based routing protocol, not just metric-based. And at the heart of this policy […]

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