{"id":49746,"date":"2026-08-01T16:52:18","date_gmt":"2026-08-01T13:52:18","guid":{"rendered":"https:\/\/trueconf.com/blog\/?p=49746"},"modified":"2026-09-23T18:35:17","modified_gmt":"2026-09-23T15:35:17","slug":"air-gap","status":"publish","type":"post","link":"https:\/\/trueconf.com/blog\/reviews-comparisons\/air-gap","title":{"rendered":"Air Gap Security: How Air Gapped Networks Work?"},"content":{"rendered":"

An air gap<\/strong> is a security architecture in which a computer, network, or system is isolated from less trusted networks, especially the public internet. The term air-gap security<\/a><\/strong> refers to this use of deliberate isolation as a security control. NIST defines an air gap as an interface where systems are not physically connected and any logical connection is not automated, meaning that data crosses the boundary manually under human control.<\/p>\n

Air gapped environments are used when reducing network exposure is more important than convenience. Typical examples include defense systems, classified networks, industrial control systems, research environments, critical infrastructure<\/a>, and organizations that need communications or applications to continue without public internet access<\/a>.<\/p>\n

An air gap does not make a system automatically secure. Removable media, supply chain compromises, compromised laptops, malicious peripherals, misconfigured transfer procedures, and human error can still introduce threats. Effective air gap security therefore combines network isolation with strict controls for software, identities, updates, data transfer<\/a>, endpoints, and administration.<\/p>\n

Air Gap at a Glance<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
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Question<\/strong><\/p>\n<\/th>\n

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Short Answer<\/strong><\/p>\n<\/th>\n<\/tr>\n<\/thead>\n

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What is an air gap?<\/strong><\/p>\n<\/td>\n

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Isolation between systems that prevents normal automated network communication<\/p>\n<\/td>\n<\/tr>\n

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Does an air gapped system use a network?<\/strong><\/p>\n<\/td>\n

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It can use an internal network, but that network is isolated from less trusted networks<\/p>\n<\/td>\n<\/tr>\n

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Is an air gap the same as a firewall?<\/strong><\/p>\n<\/td>\n

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No. A firewall controls network traffic, while a true air gap removes normal network connectivity across the boundary<\/p>\n<\/td>\n<\/tr>\n

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Can data enter an air gapped network<\/a>?<\/strong><\/p>\n<\/td>\n

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Yes, but transfer must be deliberately controlled<\/p>\n<\/td>\n<\/tr>\n

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Where are air gaps used?<\/strong><\/p>\n<\/td>\n

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Defense, government, industrial systems, research, critical infrastructure, and other high security environments<\/p>\n<\/td>\n<\/tr>\n

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Is an air gap completely secure?<\/strong><\/p>\n<\/td>\n

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No. Malware can still enter through removable media, transferred files, peripherals, insiders, or compromised supply chains<\/p>\n<\/td>\n<\/tr>\n

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Can collaboration software<\/a> work inside an air gap?<\/strong><\/p>\n<\/td>\n

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Yes, if the server, clients, identity services, storage, and required dependencies are available locally<\/p>\n<\/td>\n<\/tr>\n

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What is the main tradeoff?<\/strong><\/p>\n<\/td>\n

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Greater infrastructure isolation in exchange for more complex operations, updates, and data transfer<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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What Is an Air Gap?<\/h2>\n

\"Communications<\/p>\n

An air gap separates a system from another network so that normal automated network communication cannot cross the boundary.<\/p>\n

The strictest interpretation is physical isolation. The protected network has no direct physical connection to the internet or another less trusted network. Network cables, routers, wireless interfaces, and other communication paths are deliberately absent or disabled.<\/p>\n

In practice, organizations may also use highly isolated logical environments with tightly controlled gateways. These are often described as air gapped in product documentation, although they are not always identical to the strict physical definition.<\/p>\n

The distinction matters because security depends on the actual architecture rather than the label.<\/p>\n<\/div>\n

How Does an Air Gapped Network Work?<\/h2>\n

An air gapped network contains the infrastructure needed to operate independently.<\/p>\n

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A typical environment may include:<\/em><\/p>\n