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Network Security Group (NSG) vs Application Security Group

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.

 

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

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