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Curated reference links for Network Architectures

Whether you are preparing for a network design certification, architecting your first data center fabric, or simply curious how Google and Meta build networks at planetary scale — this post collects the best reference links for six major network architecture domains, organized from vendor design guides to real-world engineering papers. 1. Enterprise Network Architecture Enterprise (campus) networks follow the classic hierarchical model: access , distribution , and core layers, with two-tier "collapsed core" variants for smaller sites. Cisco Enterprise Campus Infrastructure Design Guide (PDF) — consolidated best practices across access, distribution, and core layers. Cisco Enterprise Campus 3.0 Architecture: Overview and Framework — design criteria, topologies, and campus services. CCDE Study Guide: Enterprise Campus Architecture Design (free Cisco Press chapter) — hierarchical design models, modularity, Layer 3 routing considerations, and cam...
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Campus Network Architecture

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Why do we use Hierarchical LAN Design Models ?  We divide the network architecture into modular layers so that we can achieve the following, Each Layer implements and performs a specific function Helps the network to scale easily  Provides Fault isolation and facilitates easier troubleshooting Modular Building Blocks: Hierarchical LAN Design breaks the network into 3 building blocks: Access Layer  Distribution Layer  Core Layer Campus Network Architecture: The Access Layer Access Layer AKA the “Network Edge” it’s the block where the end user devices are attached.  End User Devices – PC’s, IP Phones, Wireless Access Points, Printers, IP Cameras .. etc. Provides high bandwidth access to both wired and wireless users, Since it’s the First hop for Quality of Service (QOS) trust points. Access Layer can be logically segment using VLANs, where we can have different logical networks for performance, management and security Communication between the Access Blocks occurs...
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