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While engineers focus on building and troubleshooting, architects design the entire network, make technology decisions, and plan for scale, security, and failure recovery. They think in terms of systems, policies, and long-term strategy, not just devices and configs. So a

VPLS (Virtual Private LAN Service) is a Layer 2 VPN technology that allows service providers to connect multiple customer sites over an MPLS backbone as if they are all on the same Ethernet LAN. In VPLS, every participating PE router builds a full-mesh of pseudowires with all

Cisco Identity Services Engine (ISE) is a security platform that helps you control who can access your network, how, and from where. It checks the identity of users and devices before allowing them on the network. You can set rules, for example, only company laptops can access

Network Engineers can relate it! 😊

Network automation means using tools, scripts, or software to manage the network like configuring routers, checking devices, or fixing issues without logging in and typing commands manually. As networks get bigger, manual work becomes slow and error-prone. Automation helps us

Feasible successor in EIGRP is a backup route that meets specific conditions and is ready to be used if the main route fails. The main benefit is fast failover, so, no need to recalculate when the primary path goes down. But it is not always available, and it can use extra

Router on a stick 😊👍 #Networking

Node SID in Segment Routing is an important component. A Node SID is a special type of Prefix SID that points to a router’s loopback address. It tells the network to send packets to that router using the IGP shortest path. Other Prefix SIDs include: Node SID (unique per router)

SD-WAN (Software-Defined WAN) is a smarter way to manage wide area networks. Instead of relying only on expensive MPLS links, SD-WAN lets you use multiple transport types, like internet, LTE, or MPLS, together, with centralized control and intelligent path selection. Some of

Good morning everyone! Today, I’d like to share some of the important updates and improvements we’ve made on our IT training platform, orhanergun.net, especially in the past year and for some of them, even just in the last few months. To make it easy to follow, I’m

Some people like to learn by watching videos. Some people like to learn by reading. If you’re someone who prefers reading, we have good news! We offer many PDF e-books that you can buy and download from orhanergun.net. These books are written by expert instructors and

Made my day, thanks David 🙏🥰

Routing table 👍😊

BGP Add-Path is a simple but powerful feature. Normally, BGP only shares one best path for each network. But sometimes we have multiple good paths, and by default, BGP hides the others. With Add-Path, a router can send more than one path for the same prefix. This helps with

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For years, network devices came as all-in-one boxes, hardware and software bundled from a single vendor. You had no choice but to buy the whole package. Disaggregation changes that. Now, you can buy hardware from one vendor and run software (like a network OS) from another.

Routers move packets from one place to another. When a packet comes in, the router checks where it needs to go and sends it out the right port. There are two main parts inside a router: Control plane: This part learns the best paths using routing protocols like OSPF or BGP. It

In every network, you need DNS, DHCP, and IP address management. Doing this manually is hard, slow, and causes problems, like IP conflicts or DNS outages. Infoblox makes it easier by giving you one platform to manage: DNS and DHCP IP address space (IPAM) Network automation and

Orhan Ergun Before - After 😀