Network security can be defined as the process of protecting resources against unauthorized access and attacks by enforcing control over network traffic. The goal is to ensure that only legitimate traffic is allowed. Azure includes a robust network infrastructure that supports the connectivity requirements of applications and services. Network connections are possible between resources in Azure, between local resources and Azure host resources, and between the Internet and Azure.
Azure networking provides the infrastructure necessary to securely connect VMs to one another and to connect on-premises datacenters with Azure VMs. Because Azure’s shared infrastructure hosts hundreds of millions of active VMs, protecting the security and confidentiality of network traffic is critical. In the traditional datacenter model, a company’s IT organization controls networked systems, including physical access to networking equipment. In the cloud service model, the responsibilities for network protection and management are shared between the cloud provider and the customer. Customers do not have physical access, but they implement the logical equivalent within their cloud environment through tools such as Guest operating system (OS) firewalls, Virtual Network Gateway configuration, and Virtual Private Networks.
Azure is a multitenant service, meaning that multiple customers’ deployments and VMs are stored on the same physical hardware. Azure uses logical isolation to segregate each customer’s data from that of others. This provides the scale and economic benefits of multitenant services while rigorously preventing customers from accessing one another’s data.
A customer can assign multiple deployments within a subscription to a virtual network and allow those deployments to communicate with each other through private IP addresses. Each virtual network is isolated from other virtual networks.
VPN And ExpressRoute
Microsoft enables connections from customer sites and remote workers to Azure Virtual Networks using Site-to-Site and Point-to-Site VPNs. For even better performance, customers can use an optional ExpressRoute, a private fiber link into Azure datacenters that keeps their traffic off the Internet.
Built-in cryptographic technology enables customers to encrypt communications within and between deployments, between Azure regions, and from Azure to on-premises datacenters.
Microsoft Azure and other public clouds are changing the way organizations deploy and protect distributed services. One of the key benefits of deploying in the public cloud is that users or applications can quickly connect to services from anywhere in the world, providing a scalable and highly available virtual network infrastructure. Because these networks are entry points into applications, they must only accept traffic from explicitly authorized users, applications, or protocols and be at the forefront of threat protection. Protecting these networks can be difficult because it can include a variety of virtual appliances and a dynamic network infrastructure without allowing administrators to access the basic physical network infrastructure.
A Microsoft solution that simplifies virtual network security is to use a management layer called the Network Security Group (NSG) that allows administrators to easily organize, filter, and route different types of network traffic. You can place any Azure virtual network in a security group and configure different inbound and outbound rules to allow or deny certain types of traffic.
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