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# Network Security Groups Network Security Groups (NSGs) serve as centralized firewall policy managers, enabling the filtering of network traffic to and from virtual network resources within a given [Virtual Data Center (VDC)](https://docs.ionos.com/cloud/support/general-information/glossary-of-terms#virtual-data-center-vdc). An NSG contains bidirectional security firewall rules that allow ingress (incoming) and egress (outgoing) network traffic for [Network Interface Cards (NICs)](https://docs.ionos.com/cloud/support/general-information/glossary-of-terms#network-interface-card-nic) or [Virtual Machine (VM)](https://docs.ionos.com/cloud/support/general-information/glossary-of-terms#virtual-machine-vm) resources configured as NSG members. For each rule, you can specify the source IP address, destination IP address, port, protocol, etc. ## Product Overview

Network Security Groups	Learn more about its functionality, features, and benefits.	overview

## Quick Links

DCD How-Tos	Create, configure, and manage Network Security Groups within the DCD.	how-tos
API How-Tos	Create, configure, and manage Network Security Groups through the API.	api-how-tos

## Developer Tools

Network Security Groups API	Cloud API documentation for Network Security Groups.	https://api.ionos.com/docs/cloud/v6/#tag/Security-Groups
Network Security Groups SDKs	SDK documentation for Network Security Groups.	https://docs.ionos.com/cloud/reference/software-development-kits/sdks/cloud-api-sdks
Config Management Tools	Config Management Tools for Network Security Groups.	https://docs.ionos.com/cloud/reference/config-management-tools/config-management-tools

## Frequently Asked Questions (FAQ)

FAQ	Get answers to the most commonly encountered questions about Network Security Groups.	nsg-faqs

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