{"id":257,"date":"2026-05-07T10:31:03","date_gmt":"2026-05-07T15:31:03","guid":{"rendered":"https:\/\/localhost\/wp\/?p=257"},"modified":"2026-06-04T14:39:45","modified_gmt":"2026-06-04T19:39:45","slug":"are-firewalls-still-relevant-edr","status":"publish","type":"post","link":"https:\/\/ancsystems.com\/blog\/are-firewalls-still-relevant-edr\/","title":{"rendered":"Are Firewalls Still Relevant When You Have Endpoint Detection and Response (EDR)?\u00a0| ANC Systems."},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Are Firewalls Still Relevant When You Have Endpoint Detection and Response (EDR)?<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If&nbsp;you&#8217;ve&nbsp;recently invested in an Endpoint Detection and Response (EDR) solution, you might be asking yourself: do we still need&nbsp;a firewall?&nbsp;It&#8217;s&nbsp;a fair question \u2014 and one we hear often from IT managers and business owners trying to rationalize their security stack. The short answer is yes, absolutely. But understanding&nbsp;<em>why<\/em>&nbsp;will help you make smarter decisions about your cybersecurity investments.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In this article,&nbsp;we&#8217;ll&nbsp;break down exactly what firewalls and EDR do, where each one falls short on its own, and why the most resilient organizations use both \u2014 together.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The Quick Answer: Firewalls and EDR Solve Different Problems<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Think of your cybersecurity like a modern bank.&nbsp;A firewall&nbsp;is the vault door and the security guard at the&nbsp;entrance \u2014 it&nbsp;controls who and what gets in or out. EDR is&nbsp;the&nbsp;network of cameras and motion sensors inside the bank \u2014 it&nbsp;monitors&nbsp;behavior once someone is already inside.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Remove either one&nbsp;and&nbsp;you have a meaningful gap. A bank without a front-door guard is easy to enter. A bank without interior cameras&nbsp;can&#8217;t&nbsp;catch the insider threat that already walked through security. You need both.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What Does a Firewall Actually Do?<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A firewall&nbsp;operates&nbsp;at the network level, inspecting traffic as it moves in and out of your environment. Modern next-generation firewalls (NGFWs) go far beyond simple port-and-protocol filtering.&nbsp;Here&#8217;s&nbsp;what they provide:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Network perimeter control:\u00a0<\/strong>Firewalls act as gatekeepers at the edge of your network. Before a packet of data even reaches a device, the\u00a0firewall\u00a0decides whether it should be allowed in at all.\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Blocking known malicious traffic:\u00a0<\/strong>Firewalls equipped with threat intelligence\u00a0feeds\u00a0block connections to known malware command-and-control (C2) servers, malicious IP addresses, and dangerous domains \u2014 proactively, before any endpoint is touched.\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Preventing lateral movement:\u00a0<\/strong>Once a threat is inside a network, firewalls with segmentation capabilities can limit how far it can spread. This is critical for\u00a0containing\u00a0ransomware before it encrypts your entire environment.\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Enforcing network policies:\u00a0<\/strong>Firewalls ensure that only approved applications and protocols communicate in and out of your network \u2014 reducing your attack surface significantly.\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Visibility into network traffic:\u00a0<\/strong>NGFWs provide logs and analytics on\u00a0what&#8217;s\u00a0traversing your network, helping security teams\u00a0identify\u00a0anomalies at a macro level.\u00a0<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What Does EDR Do \u2014 and Why Is It Not Enough Alone?<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">EDR solutions&nbsp;monitor&nbsp;activity on individual endpoints \u2014 laptops, desktops, servers, and mobile devices \u2014 to detect and respond to threats that have already reached those devices. Key EDR capabilities include:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Behavioral monitoring:\u00a0<\/strong>EDR watches how processes behave on an endpoint in real time.\u00a0If a Word document suddenly starts spawning command-line processes \u2014 a classic sign of a macro-based attack \u2014 EDR detects and flags it.\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Fileless attack detection:\u00a0<\/strong>Many modern attacks never write a file to disk, making traditional antivirus blind. EDR detects these in-memory attacks based on behavior, not signatures.\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Threat hunting and forensics:\u00a0<\/strong>EDR records a rich timeline of endpoint activity, enabling security teams to investigate how an attack unfolded and what data may have been accessed.\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Automated response:\u00a0<\/strong>Modern EDR platforms can automatically isolate a compromised endpoint from the network, kill malicious processes, and roll back changes \u2014\u00a0containing\u00a0damage in real time.\u00a0<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">So&nbsp;what can&#8217;t EDR do? It cannot stop malicious traffic at the&nbsp;network&nbsp;edge before it arrives at an endpoint. It cannot prevent data exfiltration through an unchecked network connection. And it provides no protection for IoT devices, network printers, or other non-endpoint assets that&nbsp;don&#8217;t&nbsp;support an EDR agent.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The Dangerous Gaps Created When You&nbsp;Rely on&nbsp;Only One<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Firewall Only \u2014 Without EDR:<\/strong>&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Advanced threats that arrive via legitimate channels (phishing emails, USB drives, compromised SaaS applications) bypass the\u00a0firewall\u00a0entirely.\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fileless malware and living-off-the-land techniques\u00a0operate\u00a0entirely within trusted processes \u2014 invisible to network-level controls.\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Once inside, an attacker can move laterally and escalate privileges with little visibility or resistance.\u00a0<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>EDR Only \u2014 Without a Firewall:<\/strong>&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Your network has no perimeter defense. Inbound attacks from the internet hit your endpoints directly, giving EDR less time to react.\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Known malicious IP addresses and command-and-control servers are never blocked \u2014 EDR must catch the resulting behavior after the connection is already made.\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Network-level attacks targeting routers, switches, IoT devices, or unmanaged assets have zero protection.\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Without network segmentation enforced by\u00a0a firewall, a single compromised endpoint can communicate freely with every other device on the network.\u00a0<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How Firewalls and EDR Work Together: A Layered Defense<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The cybersecurity industry has long endorsed a defense-in-depth approach \u2014 the idea that no single control is sufficient, and layers of protection dramatically reduce your overall risk. Firewalls and EDR are purpose-built to complement each other at different layers:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Layer 1 \u2014 Before the threat arrives:\u00a0<\/strong>The\u00a0firewall\u00a0blocks known malicious traffic, enforces network policies, and reduces the volume of threats that even reach your endpoints.\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Layer 2 \u2014 As the threat tries to execute:\u00a0<\/strong>EDR monitors endpoint behavior in real time. Even if something slips past the\u00a0firewall\u00a0(via email, a browser exploit, or a supply\u00a0chain\u00a0compromise), EDR detects the malicious activity and responds.\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Layer 3 \u2014 After the threat executes:\u00a0<\/strong>Both tools provide logs, alerts, and forensic data. The\u00a0firewall\u00a0reveals unusual outbound connections; EDR reveals what happened\u00a0on\u00a0the endpoint. Together, they tell the full story of an attack \u2014 essential for incident response and compliance reporting.\u00a0<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A Real-World Attack Scenario: What Happens Without Both?<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Consider this common ransomware attack chain:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 1:&nbsp;<\/strong>An employee clicks a phishing link and unknowingly downloads a dropper. The&nbsp;firewall&nbsp;didn&#8217;t&nbsp;block it because the domain was newly registered and not yet on any&nbsp;threat&nbsp;intel feed.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 2:&nbsp;<\/strong>The dropper attempts to contact a command-and-control server.&nbsp;The&nbsp;firewall, with an updated&nbsp;threat&nbsp;intelligence feed, blocks the outbound connection. The attack stalls.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Without the&nbsp;firewall:<\/strong>&nbsp;The C2 connection succeeds. The attacker receives the beacon, deploys the ransomware payload, and begins encrypting files. EDR detects the encryption behavior \u2014 but by the time it isolates the endpoint, dozens of files are already gone.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Without the EDR:<\/strong>&nbsp;Even if the&nbsp;firewall&nbsp;blocks C2, a variant that uses legitimate cloud services (like Google Drive or Dropbox) as a relay successfully phones home. No behavioral detection means the attacker has free rein on the endpoint.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>With both:<\/strong>&nbsp;The&nbsp;firewall&nbsp;provides the first line of resistance; EDR catches what gets through. The attack is detected and contained before business impact.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Compliance and Cyber Insurance: Both Are Often Required<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If your business&nbsp;operates&nbsp;under any regulatory framework \u2014 PCI-DSS, HIPAA, SOC 2, NIST, or ISO 27001 \u2014&nbsp;a firewall&nbsp;is&nbsp;almost certainly&nbsp;a mandated control, not an optional one. These frameworks were designed with defense-in-depth in mind and expect network-level controls to be in place regardless of what endpoint tooling you deploy.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Similarly, cyber insurance providers have become increasingly specific about the security controls they require for coverage. Many insurers now&nbsp;require&nbsp;documented evidence of both network perimeter controls and endpoint detection capabilities before issuing or renewing a policy. Dropping your&nbsp;firewall&nbsp;to &#8220;save money&#8221; can put your entire policy at risk.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Frequently Asked Questions<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Can EDR replace&nbsp;a firewall&nbsp;for small businesses?<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">No. EDR protects managed endpoints; firewalls protect the network.&nbsp;Small businesses are&nbsp;actually higher-risk&nbsp;targets precisely because they often lack layered defenses.&nbsp;Affordable next-generation&nbsp;firewall&nbsp;options exist that are purpose-built for SMBs and require minimal management overhead.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>We&#8217;re&nbsp;fully in the cloud \u2014 do we still need&nbsp;a firewall?<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. Cloud environments have their own&nbsp;firewall&nbsp;equivalents \u2014 security groups, cloud-native WAFs, and network access controls. The concept of network-level perimeter defense&nbsp;doesn&#8217;t&nbsp;disappear in the cloud; it shifts to cloud-native tools. EDR still protects&nbsp;the endpoints (virtual machines, containers, or employee workstations)&nbsp;accessing&nbsp;those cloud environments.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Is&nbsp;a firewall&nbsp;alone enough if I&nbsp;can&#8217;t&nbsp;afford EDR?<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A firewall&nbsp;provides meaningful protection and is a great foundation, but modern threats are sophisticated enough that endpoint-level visibility is increasingly critical. Many EDR solutions now offer budget-friendly tiers for small businesses. A managed security provider can often deliver both&nbsp;firewall&nbsp;management and EDR monitoring as a bundled service at a cost-effective price point.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What&#8217;s&nbsp;the difference between EDR and traditional antivirus?<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Traditional antivirus relies on signature-based detection \u2014 it looks for known malware fingerprints. EDR uses behavioral analysis to detect&nbsp;<em>unknown<\/em>&nbsp;threats by&nbsp;identifying&nbsp;suspicious activity patterns. EDR is not a replacement for AV \u2014&nbsp;it&#8217;s&nbsp;a significant advancement. Many modern endpoint security platforms bundle both capabilities.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The Bottom Line:&nbsp;Don&#8217;t&nbsp;Choose One Over the Other<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Firewalls are not&nbsp;a legacy&nbsp;technology being replaced by EDR. They are fundamentally different tools solving fundamentally different problems at different points in the attack chain. The organizations that suffer the most damaging breaches are rarely those that lack the most sophisticated tools \u2014&nbsp;they&#8217;re&nbsp;the ones that have gaps in their layered defenses.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The question&nbsp;isn&#8217;t&nbsp;&#8220;firewall&nbsp;<em>or<\/em>&nbsp;EDR?&#8221; \u2014&nbsp;it&#8217;s&nbsp;&#8220;how do we make our firewall and EDR work together as effectively as possible?&#8221;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Ready to assess your current security posture? Our team of cybersecurity specialists can evaluate how your\u00a0firewall\u00a0and EDR solutions work together \u2014 and\u00a0identify\u00a0any gaps that could leave you exposed. <a href=\"https:\/\/AncSystems.com\/form-Cybersecurity\" data-type=\"link\" data-id=\"https:\/\/AncSystems.com\/form-Cybersecurity\">Contact us today for a security review<\/a>.<\/strong>\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>About the Author:&nbsp;<\/strong><em>This article was written by the cybersecurity team at&nbsp;ANC Systems. We specialize in helping businesses of all sizes build layered, practical security programs that keep threats out and minimize damage when they get through.<\/em>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"BreadcrumbList\",\n  \"itemListElement\": [\n    {\n      \"@type\": \"ListItem\",\n      \"position\": 1,\n      \"name\": \"Blog\",\n      \"item\": \"https:\/\/ancsystems.com\/blog\/\"\n    },\n    {\n      \"@type\": \"ListItem\",\n      \"position\": 2,\n      \"name\": \"IT Technology\",\n      \"item\": \"https:\/\/ancsystems.com\/blog\/category\/it-technology\/\"\n    },\n    {\n      \"@type\": \"ListItem\",\n      \"position\": 3,\n      \"name\": \"Cybersecurity\",\n      \"item\": \"https:\/\/ancsystems.com\/blog\/category\/it-technology\/cybersecurity\/\"\n    },\n    {\n      \"@type\": \"ListItem\",\n      \"position\": 4,\n      \"name\": \"Are Firewalls Still Relevant When You Have Endpoint Detection and Response (EDR)?\",\n      \"item\": \"https:\/\/ancsystems.com\/blog\/are-firewalls-still-relevant-edr\/\"\n    }\n  ]\n}\n<\/script>","protected":false},"excerpt":{"rendered":"<p>Firewalls and EDR do different jobs \u2014 and you need both. Discover why dropping your firewall in favor of Endpoint Detection and Response leaves dangerous gaps in your security posture.<\/p>\n","protected":false},"author":1,"featured_media":278,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12,22,23,21,24,1],"tags":[26,25,28,27,29],"class_list":["post-257","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cybersecurity","category-edr","category-firewalls","category-network-security","category-smb-security","category-uncategorized","tag-cybersecurity","tag-edr","tag-firewalls","tag-network-security","tag-smb-security"],"_links":{"self":[{"href":"https:\/\/ancsystems.com\/blog\/wp-json\/wp\/v2\/posts\/257","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ancsystems.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ancsystems.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ancsystems.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ancsystems.com\/blog\/wp-json\/wp\/v2\/comments?post=257"}],"version-history":[{"count":4,"href":"https:\/\/ancsystems.com\/blog\/wp-json\/wp\/v2\/posts\/257\/revisions"}],"predecessor-version":[{"id":438,"href":"https:\/\/ancsystems.com\/blog\/wp-json\/wp\/v2\/posts\/257\/revisions\/438"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ancsystems.com\/blog\/wp-json\/wp\/v2\/media\/278"}],"wp:attachment":[{"href":"https:\/\/ancsystems.com\/blog\/wp-json\/wp\/v2\/media?parent=257"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ancsystems.com\/blog\/wp-json\/wp\/v2\/categories?post=257"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ancsystems.com\/blog\/wp-json\/wp\/v2\/tags?post=257"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}