Azure Virtual Network

The Azure Virtual Network (VNet) is like a container that provide traffic isolation and segmentation.

An Azure virtual network (VNet) is a representation of your own network in the cloud. You can control your Azure network settings and define DHCP address blocks, DNS settings, security policies, and routing. You can also further segment your VNet into subnets and deploy Azure IaaS virtual machines (VMs) and PaaS role instances, in the same way you can deploy physical and virtual machines to your on-premises datacenter. In essence, you can expand your network to Azure, bringing your own IP address blocks.

The termes which are used in VNet are as follows:

  • Virtual Network
    • Virtual Network Subnet
    • Gateway Subnet
  • Virtual Network Gateway
    • Viurtual VPN Gateway
  • Network Security Group (NSG) -> Can be assigned to
    • Virtual Network
    • Virtual Machine
    • Sunbet -> at subnet level would be prefered.
  • User Defined Routing (UDR) -> for customizing traffic.

We can have one to many VNets but of course there’s subscription limitation. All VNets are isolated boundries. But there’s different types of connectivity available between VNets according to the scenario.

Connectivity types

VNets PeeringThere’s two different VNets peering:
– Global Peering
– VNets Peering -> the VNets must be in the same region.
VPN Gateway/ TunnelThe VPN Gateway is used for different types of connectivity:
– VNet-to-VNet (Microsoft Doc)
– Site-to-site -> On-premises env to Azure VNet (Microsoft Doc)
– Point-to-site -> Laptop to Azure VNet
Express Route

Virtual Network Security

The Network Security is applied to the network via Network Security Groups (NSGs) and it has the following features:

  • It has a stateful firewalll for inbount and outbound traffic.

References

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