HLD vs LLD – What is the difference? (Updated 2020)

hld vs lld

hld vs lld

 

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

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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.

Related – Network Design Interview Questions

HLD vs LLD

Below table summarizes the differnce between HLD and LLD:

PARAMETERHLDLLD
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.

 

Hope you would have understood comparison of HLD vs LLD. Please read our other blogs related to HLD & LLD mentioned below –

CDP & LLDP 20 INTERVIEW QUESTIONS

 

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