Final answer:
A Network Security Group (NSG) is a feature of Microsoft Azure that acts as a network filter to control inbound and outbound traffic for Azure resources. NSGs allow you to define rules that permit or deny traffic based on factors such as source IP address, destination IP address, source port, destination port, and protocol. Using NSGs helps to strengthen the security of your Azure resources and prevent unauthorized access or attacks.
Step-by-step explanation:
A Network Security Group (NSG) is a feature of Microsoft Azure that acts as a network filter to control inbound and outbound traffic for Azure resources, such as virtual machines or subnets. It acts as a basic firewall by enforcing network access control rules.
NSGs allow you to define rules that permit or deny traffic based on factors such as source IP address, destination IP address, source port, destination port, and protocol. For example, you can create a rule to allow inbound traffic only on a specific port for a virtual machine. If a rule denies the traffic, it will be dropped and doesn't reach the destination resource.
Using NSGs helps to strengthen the security of your Azure resources and prevent unauthorized access or attacks. It allows you to control network traffic and restrict the communication between resources in your Azure virtual network.