From fd88040f5eb20d50ae35340569e51cf30d6b7845 Mon Sep 17 00:00:00 2001
From: Akbar Ahmed <70852077+Akbar-Ahmed@users.noreply.github.com>
Date: Thu, 24 Nov 2022 01:52:54 +0530
Subject: [PATCH] Update azure-fundamentals-az-900.md (#318)

---
 certificates/azure-fundamentals-az-900.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/certificates/azure-fundamentals-az-900.md b/certificates/azure-fundamentals-az-900.md
index 7307a47..f9ba5cf 100644
--- a/certificates/azure-fundamentals-az-900.md
+++ b/certificates/azure-fundamentals-az-900.md
@@ -22,4 +22,8 @@ Azure Firewall is a cloud-native and intelligent network firewall security servi
 </b></details>
 
 
+<details>
+<summary>What is Network Security Group?</summary><br><b>
 
+A network security group contains security rules that allow or deny inbound network traffic to, or outbound network traffic from, several types of Azure resources. For each rule, you can specify source and destination, port, and protocol.
+</b></details>