NetworkCNL
Practical networking concepts, cloud architecture, and hands-on labs—explained from real engineering experience.
Learn by Domain
Choose a track and move from concepts to implementation.
Core Networking Concepts
Routing, switching, security, load balancing, Cisco ACI, and core enterprise networking.
Cloud Networking
Azure, OCI, hybrid connectivity, cloud security, automation, and infrastructure as code.
Labs & Architecture
Hands-on labs, reference designs, troubleshooting walkthroughs, and architecture discussions.
Latest Articles
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Domain Name System (DNS) Part-II
Let us discuss these topic. These are the sequence order we will follow before we will understand how DNS resolution happens. Again, the information that is shared in this page, consider it to be at beginner level. Zone file:Well zone files are a text file that is neither encoded nor it is encrypted and it…
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Domain Name System (DNS) PART-I
Personally, I consider this topic as one of those topics which are very essential not only to understand the computer networking but also in your daily IT related task. The concept will come in handy even you are able to complete the part 1 of this document. It will build your confidence; it has built…
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Packet Flow Between Two Different Networks
We shall now discuss about packet flow between two different machines hosted behind two different routers which are acting as a gateway for the local machine in each respective region (Region 1 and Region 2).The local machine connects to layer 2 switch first and the switch has a connection to Router. Here Router is acting…
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Packet Flow :: Using A Layer 2 Switch
In our previous section we saw how the traffic flows between two different machines which were in the same network address. We only saw how MAC address gets exchanged within the same network. Now we will discuss about packet flow in a network topology within a single broadcast domain and multiple collision domain. In short,…
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IP Flow :: In General
Let’s discuss in general on how a packet from a source machine flows to the destination machine (for now we are not considering any switch or router in between). The packet details are not shown under this topic. 1) A user machine maintains two types of tables: a)Network Table and b)ARP Table. Both this table…
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Quick Overview of Broadcast Domain & Collision Domain
In my previous discussions, I mentioned about a layer 2 switch being a single broadcast domain and multiple collision domain whereas a Layer 3 switch or a router is a multiple broadcast domain and multiple collision domain. So here we will learn about little bit about both these terms and in the world of Ethernet…