What is a Security Stack?
A security stack is a set of complementary security tools that work together to protect your business from different types of threats. No single tool catches everything. Just like a building has locks, alarms, and cameras, your network needs multiple layers of defense. This concept is called "defense in depth."
For small businesses, the stack does not need to be complex or expensive. Enterprise companies might deploy dozens of specialized security tools, but that level of complexity requires a dedicated security team to manage. Small businesses need a stack that is effective, affordable, and simple enough to run without specialized IT expertise.
Three well-chosen layers provide strong protection against the vast majority of threats that small businesses face: a VPN to encrypt all traffic, DNS filtering to block malicious domains, and malware scanning to catch threats that slip through. Together, these three layers create overlapping zones of protection that are far stronger than any single tool alone.
Key point: You do not need a dozen tools or a dedicated security team. Three well-chosen layers (VPN, DNS filtering, and malware scanning) cover the vast majority of threats small businesses face.
Layer 1: VPN (Encrypt Everything)
The VPN is the foundation of your security stack. It creates an encrypted tunnel between your devices and the internet using the WireGuard protocol, ensuring that all data passing through the tunnel is unreadable to anyone who intercepts it. Think of it as armored transport for all your internet traffic.
A VPN protects against several critical threats:
- Eavesdropping on public Wi-Fi networks
- Man-in-the-middle attacks that intercept or alter your data
- ISP tracking and data collection
- Network-level surveillance and traffic analysis
Without a VPN, your internet traffic is visible to anyone on the same network, your ISP, and potentially anyone along the route between you and the server you are communicating with. With a VPN, all they see is encrypted data flowing to a VPN server: the contents, destinations, and nature of your traffic are hidden.
Layer 2: DNS Filtering (Block Bad Domains)
DNS is the phone book of the internet. Every time you visit a website, your device makes a DNS query to translate the domain name (like example.com) into an IP address. DNS filtering intercepts these queries and checks every domain lookup against constantly updated threat intelligence databases.
DNS filtering protects against:
- Phishing sites that mimic legitimate login pages to steal credentials
- Known malware distribution sites that host malicious downloads
- Command-and-control servers used by botnets to coordinate attacks
- Unwanted content categories that violate your acceptable use policy
The key advantage of DNS filtering is that it stops threats before they reach your device. When an employee clicks a link to a malicious site, the DNS query is checked first. If the domain is flagged as malicious, the connection is blocked before any data is exchanged: before the phishing page loads, before the malware downloads, before any damage is done.
Layer 3: Malware Scanning (Catch Bad Downloads)
Malware scanning inspects downloaded content; it usually runs on each device (antivirus) or a gateway. While DNS filtering blocks known bad domains, malware scanning catches threats that come from domains not yet flagged, including compromised legitimate sites and newly created attack infrastructure.
Malware scanning protects against:
- Malware downloads including trojans, ransomware, and spyware
- Malicious file attachments embedded in web content
- Drive-by downloads from compromised websites
- Zero-day threats detected through behavioral analysis
When the scanning happens at a gateway, there is no software to install on individual devices. Malicious payloads are detected and blocked before they ever reach the endpoint, stopping infections at the network perimeter rather than relying on each device to protect itself.
How the Layers Work Together
Each layer catches what the others might miss. The real power of a security stack is in the overlap. Consider an attack scenario: an employee clicks a phishing link. Layer 2 (DNS filtering) recognizes the malicious domain and blocks the connection: threat stopped. But what if the attacker registered the domain five minutes ago and it is not yet in any threat database?
The DNS query passes through and the browser connects to the phishing site, which attempts to deliver a malicious payload. Layer 3 (malware scanning, for example endpoint antivirus) can still catch the download. Even if both miss the threat, Layer 1 keeps the connection encrypted between the device and the VPN server, so attackers on the network cannot inject additional payloads or intercept credentials. Three independent checks. Three chances to stop the threat.
Key point: Each layer catches what the others miss. Three independent checks mean three chances to stop every threat: that is the power of defense in depth.
One Product, Two Layers
Most businesses would need to purchase, configure, and manage three separate tools to get these protections: three vendors, three billing cycles, three dashboards, and the challenge of making them work together. VeloGuardian includes the first two layers in one product: WireGuard VPN for all traffic, and DNS filtering (ads on Shield and up; malware and phishing domains on Fortress and Citadel). Pair it with endpoint antivirus for Layer 3.
One subscription. One app. Both layers working together automatically from the moment your team connects. No complex configuration, no integration headaches, and no gaps between tools.