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An air gapped network (right) with no connection to a nearby internet-connected network (left) An air gap, air wall, air gapping [1] or disconnected network is a network security measure employed on one or more computers to ensure that a secure computer network is physically isolated from unsecured networks, such as the public Internet or an unsecured local area network. [2]
Windows Firewall settings in Windows XP Service Pack 2.. Windows Firewall was first introduced as part of Windows XP Service Pack 2. Every type of network connection, whether it is wired, wireless, VPN, or even FireWire, has the firewall enabled by default, with some built-in exceptions to allow connections from machines on the local network.
Firewall appliances may also offer non-firewall functionality, such as DHCP [11] [12] or VPN [13] services. Host-based firewalls are deployed directly on the host itself to control network traffic or other computing resources. [14] [15] This can be a daemon or service as a part of the operating system or an agent application for protection.
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In computing, the term 3 GB barrier refers to a limitation of some 32-bit operating systems running on x86 microprocessors. It prevents the operating systems from using all of 4 GiB ( 4 × 1024 3 bytes ) of main memory. [ 1 ]
BloodNet uses the term to describe the technology the player must overcome when hacking a computer system. Cyberpunk 2077 uses the term to refer to defensive countermeasures that prevent netrunners and cyberware from hacking a target. Deus Ex, where the player's hacking program is referred to as an "ICE Breaker"
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In computer security, hardening is usually the process of securing a system by reducing its attack surface, which is larger when a system performs more functions; in principle a single-function system is more secure than a multipurpose one.