This topic will cover the fundamentals of network design, including understanding network requirements, identifying network components, and defining network goals.
Introduction to Network Design
Key concepts, steps, and best‑practice guidelines for planning and building reliable, scalable networks.
| Aspect | Description |
|---|---|
| Definition | The process of planning the architecture, components, and services that enable devices to communicate efficiently and securely. |
| Goal | Deliver required performance, availability, security, and cost‑effectiveness for current and future needs. |
| Scope | Physical topology, logical topology, hardware selection, addressing scheme, routing & switching, security controls, management, and documentation. |
| Principle | Why It Matters | Typical Implementation |
|---|---|---|
| Scalability | Network must grow without major redesign. | Hierarchical (core‑distribution‑access) layers; modular hardware; address pool planning (e.g., IPv6). |
| Reliability / Redundancy | Minimize downtime. | Dual links, link aggregation, redundant routers/switches, rapid failover protocols (HSRP/VRRP, BGP PIC). |
| Performance | Meet latency, bandwidth, and QoS requirements. | Proper bandwidth provisioning, traffic engineering, QoS policies, WAN optimization. |
| Security | Protect data and resources. | Segmentation (VLANs, firewalls), ACLs, encryption, zero‑trust principles. |
| Manageability | Simplify operations and troubleshooting. | Centralized monitoring (SNMP, NetFlow), configuration management, standardized naming. |
| Cost‑Effectiveness | Optimize CAPEX and OPEX. | Use commodity hardware where possible, leverage virtualization, adopt cloud services wisely. |
Gather Requirements
Assess Current Environment
Define Logical Architecture
Select Physical Components
Design Redundancy & High Availability
Plan Security Controls
Define QoS & Traffic Engineering