# 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 [<mark style="color:blue;">Virtual Data Center (VDC)</mark>](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 [<mark style="color:blue;">Network Interface Cards (NICs)</mark>](https://docs.ionos.com/cloud/support/general-information/glossary-of-terms#network-interface-card-nic) or [<mark style="color:blue;">Virtual Machine (VM)</mark>](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

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><mark style="color:blue;"><strong>Network Security Groups</strong></mark></td><td>Learn more about its functionality, features, and benefits.</td><td><a href="network-security-groups/overview">overview</a></td></tr></tbody></table>

## Quick Links

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><mark style="color:blue;"><strong>DCD How-Tos</strong></mark></td><td>Create, configure, and manage Network Security Groups within the DCD.</td><td><a href="network-security-groups/how-tos">how-tos</a></td></tr><tr><td><mark style="color:blue;"><strong>API How-Tos</strong></mark></td><td>Create, configure, and manage Network Security Groups through the API.</td><td><a href="network-security-groups/api-how-tos">api-how-tos</a></td></tr></tbody></table>

## Developer Tools

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><mark style="color:blue;"><strong>Network Security Groups API</strong></mark></td><td>Cloud API documentation for Network Security Groups.</td><td><a href="https://api.ionos.com/docs/cloud/v6/#tag/Security-Groups">https://api.ionos.com/docs/cloud/v6/#tag/Security-Groups</a></td></tr><tr><td><mark style="color:blue;"><strong>Network Security Groups SDKs</strong></mark></td><td>SDK documentation for Network Security Groups.</td><td><a href="https://docs.ionos.com/reference/software-development-kits/sdks/cloud-api-sdks">https://docs.ionos.com/reference/software-development-kits/sdks/cloud-api-sdks</a></td></tr><tr><td><mark style="color:blue;"><strong>Config Management Tools</strong></mark></td><td>Config Management Tools for Network Security Groups.</td><td><a href="https://docs.ionos.com/cloud/reference/config-management-tools/config-management-tools">https://docs.ionos.com/cloud/reference/config-management-tools/config-management-tools</a></td></tr></tbody></table>

## Frequently Asked Questions (FAQ)

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><mark style="color:blue;"><strong>FAQ</strong></mark></td><td>Get answers to the most commonly encountered questions about Network Security Groups.</td><td><a href="network-security-groups/nsg-faqs">nsg-faqs</a></td></tr></tbody></table>