Network Security Group (NSG) vs Application Security Group

Last updated on March 20, 2023

	Network Security Group	Application Security Group
Description	A network security group is used to enforce and control network traffic.	An application security group is an object reference within an NSG.
Features	Controls the inbound and outbound traffic at the subnet level.	Controls the inbound and outbound traffic at the network interface level.
Rules	Rules are applied to all resources in the associated subnet.	Rules are applied to all ASGs in the same virtual network.
Direction	Has separate rules for inbound and outbound traffic.	Has separate rules for inbound and outbound traffic.
Limits	NSG has a limit of 1000 rules.	ASGs that can be specified within all security rules of an NSG have a limit of 100 rules.
Action	Supports ALLOW and DENY rules.	Supports ALLOW and DENY rules.
Constraints	You are not allowed to specify multiple IP addresses and IP address ranges in the NSG created by the classic deployment model.	You are not allowed to specify multiple ASGs in the source or destination.

Network Security Group (NSG) vs Application Security Group Resources:

https://docs.microsoft.com/en-us/azure/virtual-network/security-overview
https://docs.microsoft.com/en-us/azure/virtual-network/application-security-groups

Written by: Jon Bonso

Jon Bonso is the co-founder of Tutorials Dojo, an EdTech startup and an AWS Digital Training Partner that provides high-quality educational materials in the cloud computing space. He graduated from Mapúa Institute of Technology in 2007 with a bachelor's degree in Information Technology. Jon holds 10 AWS Certifications and is also an active AWS Community Builder since 2020.

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Network Security Group (NSG) vs Application Security Group

Network Security Group (NSG) vs Application Security Group

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