--- title: "Why \"Defense in Depth\" is not an option in the IT environment, but a must" description: "\"Defense in Depth\" effectively protects SMEs against cyberattacks - with multiple, coordinated layers of security instead of just a single protection mechanism." image: https://rheintec.io/hubfs/LinkedIn%20Post%20-%20Defense%20in%20Depth.png --- [Skip to content](https://rheintec.io/en/it-security-blog/why-defense-in-depth-in-it-is-not-an-option-but-a-necessity#main-content) [![Rheintec logo](https://rheintec.io/hubfs/website_assets/logo/logo-white.svg "Rheintec logo")](https://rheintec.io/home?hsLang=en) - [ KMU ](https://kmu.rheintec.io/de-ch/it-fuer-kmus) - [Enterprise](https://rheintec.io/en/it-security-blog/why-defense-in-depth-in-it-is-not-an-option-but-a-necessity#) Show submenu for Enterprise - [Consulting](https://rheintec.io/en/it-security-blog/why-defense-in-depth-in-it-is-not-an-option-but-a-necessity#) Show submenu for Consulting - [ IT Security Consulting ](https://rheintec.io/en/consulting/security/it-security-consulting) - [ Cyber Security Review ](https://rheintec.io/en/consulting/cybersecurity-review) - [ Governance, Risk & Compliance Consulting ](https://rheintec.io/en/consulting/compliance-and-governance) - [Zscaler](https://rheintec.io/en/it-security-blog/why-defense-in-depth-in-it-is-not-an-option-but-a-necessity#) Show submenu for Zscaler - [ Zscaler Architecture Consulting ](https://rheintec.io/en/consulting/zscaler/architecture-consulting) - [ Zscaler Health Checks ](https://rheintec.io/en/consulting/zscaler/healthchecks) - [ Zscaler Automation ](https://rheintec.io/en/consulting/zscaler/automation) - [ Zscaler Proof of Concepts ](https://rheintec.io/en/consulting/zscaler/proof-of-concept) - [ Z-Automate ](https://rheintec.io/en/zscaler-automation-tool) - [ Solutions ](https://rheintec.io/en/it-security-blog/why-defense-in-depth-in-it-is-not-an-option-but-a-necessity#services) Show submenu for Solutions - [ Bring Your Own Device (BYOD) ](https://rheintec.io/en/solutions/zscaler-remote-browser-access) - [ CNAPP ](https://rheintec.io/en/managed-services/enterprises/wiz) - [ Secure Access Service Edge (SASE) ](https://rheintec.io/en/solutions/secure-access-service-edge) - [ Secure Service Edge ](https://rheintec.io/en/managed-services/enterprises/zscaler-sse) - [ Zscaler Data Security ](https://rheintec.io/en/solutions/zscaler-data-security) - [ SD-WAN & WAN-Edge ](https://rheintec.io/en/managed-services/enterprises/ubiquitiy-wan-edge) - [ Z-Automate ](https://rheintec.io/en/zscaler-automation-tool) - [Managed Services](https://rheintec.io/en/it-security-blog/why-defense-in-depth-in-it-is-not-an-option-but-a-necessity#) Show submenu for Managed Services - [ Managed Security Services ](https://rheintec.io/en/managed-security-services) - [ Small & Medium Companies (5-250) ](https://rheintec.io/managed-services/small-medium-companies-smb) Show submenu for Small & Medium Companies (5-250) - [ Zscaler 4 Small Businesses ](https://rheintec.io/en/managed-services/small-companies/zscaler-sse-4-small-businesses) - [ CrowdStrike XDR 4 Small Businesses ](https://rheintec.io/en/en/managed-services/small-companies/crowdstrike-xdr-4-small-businesses) - [ Mimecast 4 Small Businesses ](https://rheintec.io/de/mimecast-for-kmu) - [ Proofpoint 4 Small Businesses ](https://rheintec.io/en/rheintec-proofpoint-mail-sicherheit-f%C3%BCr-kmu-kleinunternehmen) - [ Small Business Secure ](https://rheintec.io/en/managed-services/small-companies/small-business-secure) - [ Small Business Complete ](https://rheintec.io/en/managed-services/small-companies/small-business-complete) - [ Medium Business Complete
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Small and medium-sized companies are particularly vulnerable: limited resources, often incomplete security measures. This is exactly where **Defense in Depth** comes in - and for good reason. ## 1 **The reality: Mailing in the sights** 90% of cyberattacks start with an email - either as a phishing or malware trap. This means that email security is more important than ever - but not enough on its own. ## 2. **more layers. More protection.** Individual measures are not enough. A multi-layered security concept increases resistance exponentially: - **Email protection** remains the first rampart - via solutions such as Proofpoint or Mimecast. The latter uses AI to analyze emails for sender anomalies, content, attachments and links - and adapts to new attack patterns [rheintec.io](https://rheintec.io/en/it-security-blog/securing-email-communications-with-mimecasts-advanced-tools?utm_source=chatgpt.com&hsLang=en). - **Web filters & web security** (e.g. Zscaler) block drive-by downloads and dangerous websites - the next line of defense [rheintec.io+1](https://rheintec.io/en/it-security-blog/top-security-solutions-for-small-business-owners?utm_source=chatgpt.com&hsLang=en). - **Endpoint security** (e.g. CrowdStrike XDR) detects malware that slips through despite previous measures [rheintec.io](https://rheintec.io/en/it-security-blog/top-security-solutions-for-small-business-owners?utm_source=chatgpt.com&hsLang=en). - **Backups & recovery** (e.g. Rubrik) form the last bastion: data can be restored - and even deeply hidden malware can be identified and removed [rheintec.io](https://rheintec.io/en/it-security-blog/top-security-solutions-for-small-business-owners?utm_source=chatgpt.com&hsLang=en). ## 3. **integration increases the effect** Simply using several tools side by side is good. But when they interact, it's better: email findings (Proofpoint, Mimecast) can make web filters (Zscaler) smarter, which in turn deliver insights to endpoint solutions (CrowdStrike) - for even better detection and response [rheintec.io+2rheintec.io+2](https://rheintec.io/en/it-security-blog/top-security-solutions-for-small-business-owners?utm_source=chatgpt.com&hsLang=en). ## 4. **security ... right from the start** The "Secure by Design" concept means that security solutions are seamlessly integrated and form an integral part of the infrastructure - implemented from the outset, not added as an afterthought [rheintec.io](https://rheintec.io/en/it-security-blog/top-security-solutions-for-small-business-owners?utm_source=chatgpt.com&hsLang=en). ## 5 **Regulatory requirements and resilience** The need is also reinforced by regulatory requirements - such as the **EU** NIS2 Directive, which has been in force since October 2024. It requires security management, risk management, supply chain security and structured incident response processes [rheintec.io](https://rheintec.io/de-de/it-security-blog/nis2-neuer-leitfaden-zur-eu-cybersicherheitsrichtlinie?utm_source=chatgpt.com&hsLang=en). --- ## **Conclusion: Why "Defense in Depth" is indispensable** A single protection mechanism - be it a spam filter, antivirus or firewall - is like a single protective shield: easy to break through. Only the interaction of multiple, distributed security levels prevents a single error or compromise from endangering the entire organization. For SMEs in particular, this means - Targeted investment in multiple layers of security, - integration and automated detection, - proactive preparation instead of reactive emergency files. ## How can I protect myself? First of all, check [here](https://rheintec.io/de-ch/dmarc-dns-sec-pr%C3%BCfen) whether you have the wrong email configuration yourself. And if you want to be absolutely sure, take a look at our SME offers [here](https://kmu.rheintec.io/de-ch/it-fuer-kmus?hsLang=en). [Cybersecurity Strategy](https://rheintec.io/en/it-security-blog/tag/cybersecurity-strategy) ### You might like [![Digital sandbox with protected file icon for analysis in a secure IT environment](https://rheintec.io/hs-fs/hubfs/digitale-sandbox-dateianalyse-it-sicherheit.jpg?width=352&name=digitale-sandbox-dateianalyse-it-sicherheit.jpg) ](https://rheintec.io/en/it-security-blog/sandbox-it-security?hsLang=en) ##### [Sandboxing in IT Security: How Systems Isolate Malware](https://rheintec.io/en/it-security-blog/sandbox-it-security?hsLang=en) At a time when cyberattacks are becoming increasingly sophisticated, it is crucial to detect malware before it is executed. This is where the concept of sandboxingcomes into play. But what is meant by a sandbox? And how can it significantly improve IT security in companies? [![Cloud computing symbol in modern office environment, illustrates Zscaler and secure data access.](https://rheintec.io/hs-fs/hubfs/SASE%20Implementation%20Example-1.png?width=352&name=SASE%20Implementation%20Example-1.png) ](https://rheintec.io/en/it-security-blog/what-is-zscaler-an-overview?hsLang=en) ##### [What is Zscaler?](https://rheintec.io/en/it-security-blog/what-is-zscaler-an-overview?hsLang=en) If you are looking for a powerful solution for your cloud security, sooner or later you will come across the name Zscaler. But what is Zscaler? Generally speaking, it's a cloud-based security service that helps companies protect themselves against threats on the internet and manage their data... [![Woman looks seriously into camera with digital warning symbols about social engineering dangers](https://rheintec.io/hs-fs/hubfs/social-engineering-gefahren-visualisierung-frau-mit-warnsymbolen.jpg?width=352&name=social-engineering-gefahren-visualisierung-frau-mit-warnsymbolen.jpg) ](https://rheintec.io/en/it-security-blog/recognize-and-defend-against-social-engineering?hsLang=en) ##### [Social Engineering: Definition, Significance, and Protection Against Attacks](https://rheintec.io/en/it-security-blog/recognize-and-defend-against-social-engineering?hsLang=en) What is social engineering? Social engineering refers to a method in which attackers attempt to manipulate people in a targeted manner in order to disclose sensitive information or carry out security-relevant actions. In contrast to traditional cyber attacks, which exploit technical... ## How much does IT security cost for your SMB? Easily estimate your IT security expenses with our pricing calculator. 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