What is networking & security (VNet, zero trust)?
Networking & security covers the design and protection of the network layer of a cloud environment. A virtual network (VNet) logically isolates resources and controls their traffic; zero trust is the principle of never trusting any access blindly but verifying every access — regardless of whether it comes from the internal network.
Also known as: VNet · virtual network · zero trust · network security · network segmentation
Where networking & security is used
In the cloud, the network is its own security layer. A virtual network (VNet) groups resources in an isolated area, in which subnets and rules control which components may communicate with each other and with the internet. This creates a controlled attack surface instead of an open system.
Zero trust complements this as a basic stance: there is no longer an implicitly trustworthy internal network. Every access is authenticated, authorised and granted as minimally as possible. Upstream services such as Azure Front Door filter inbound traffic before it even reaches internal components.
A practical example
For a SaaS platform, the internal components sit in an Azure virtual network and are not directly reachable from the internet. Inbound traffic runs through Azure Front Door, which serves as a protected entry point and intercepts unwanted requests. Access is consistently verified, so that even within the environment there is no blind trust.
How it relates & how smiit uses it
Networking & security addresses the network and transport layer and is therefore distinct from IAM, which governs identities and access rights — both are complementary building blocks of IT security and jointly contribute to GDPR-compliant data protection. For Claimity AG, smiit built an Azure environment with a virtual network, Azure Front Door and Azure Key Vault, creating an isolated infrastructure designed along zero-trust principles.
Common mistakes & misconceptions
- Network security is often reduced to a perimeter firewall; modern threats, however, require segmentation and protection inside the network as well.
- Many believe internal network traffic is automatically trustworthy — the zero trust model instead assumes that no location or device should be trusted by default.
- People assume a VPN or encryption alone is enough; without consistent authentication, monitoring and access control, serious gaps remain.
Frequently asked questions
What is a virtual network (VNet)?
A VNet is a logically isolated network area in the cloud in which subnets and rules control which resources may communicate with each other and with the internet. It considerably reduces the attack surface.
Does zero trust mean you trust no one?
Zero trust means not trusting any access purely because of its origin. Instead, every access is verified and granted only as far as it is really needed — even within the internal network.
How does networking & security differ from IAM?
Networking & security secures the network and transport layer — that is, which components are even allowed to communicate with each other. IAM, by contrast, governs identities and access rights — that is, who signs in and what they may access. The two complement each other as layers of IT security.
Is a firewall enough to secure the cloud?
A firewall is an important building block, but on its own it is not sufficient. In the cloud, several layers work together: network segmentation via a VNet, upstream filtering of inbound traffic, encryption, and identity and access control along zero-trust principles.
How does zero trust differ from the classic perimeter approach?
The classic perimeter approach trusts everything inside the "internal" network and mainly secures the outer boundary. Zero trust gives up this implicit trust and verifies every access individually — which is especially useful in cloud and distributed environments where there is no longer a clear outer boundary.
Related terms
Sources & further reading
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