Table of Contents
HLD & LLD are 2 terms used commonly used in Network Design, Operation and implementation. HLD stands for High Level Design. And LLD is an abbreviation for Low Level Design.
What is HLD?
HLD is created initially during the Design journey of a Solution. It provides a high-level view of overall System setup describing the relationship of various systems and functions which combine to provide the expected solution.
What is LLD?
LLD is created on the footsteps of HLD and provides detailed and in-depth information of the HLD. Some terms related to HLD include Zoning, Traffic flow and high-level connectivity across various elements of the solution, while LLD is more related to terms like VLAN, IP address, port numbering etc.
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Comparison: HLD vs LLD
Below table summarizes the deference between HLD and LLD:
| PARAMETER | HLD | LLD |
|---|---|---|
| Abbreviation For | High Level Design | Low Level Design |
| Philosophy | Overall Network Design describing relationship between various system modules and functions. | Detailed design depicting in depth information of the HLD. |
| Translation | Converts Business Requirement into High Level Solution. | Converts High Level Solution to Detailed Solution. |
| Chronological order in design phase | Created 1st in chronological order. | Created after HLD has been designed and agreed. |
| Related terms | Zones, Traffic flows, high level connectivity across various entities. | VLAN, Port numbering, configuration settings etc. |
| Created By | Solution Architect | Designer |
| Target Audience | Used for management, Program and solution teams. | Used for Designers, Operation Teams and Implementers. |
| Expected Outcome | Required to understand flow across various system entities. | Is input for creating configurations and troubleshooting. |
Download the difference table: hld vs lld
Hope you would have understood comparison of HLD vs LLD. You may also refer the downloadable PDF format comparison table.
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