HLD and LLD
HLD & LLD are 2 terms used commonly used in Network Design, Operation and implementation.
Full-Form of HLD –
HLD stands for High Level Design
What is HLD?
HLD or high level design 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.
Full-Form of LLD –
LLD is an abbreviation for Low Level Design.
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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HLD vs LLD
Below table summarizes the differnce between HLD and 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 here.
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