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A personal firewall is an application which controls network traffic to and from a computer, permitting or denying communications based on a security policy. Typically it works as an application layer firewall. A personal firewall differs from a conventional firewall in terms of scale. A personal firewall will usually protect only the computer on which it is installed, as compared to a conventional firewall which is normally installed on a designated interface between two or more networks, such as a router or proxy server. Hence, personal firewalls allow a security policy to be defined for individual computers, whereas a conventional firewall controls the policy between the networks that it connects. The per-computer scope of personal firewalls is useful to protect machines that are moved across different networks. For example, a laptop computer may be used on a trusted intranet at a workplace where minimal protection is needed as a conventional firewall is already in place, and services that require open ports such as file and printer sharing are useful. The same laptop could be used at public Wi-Fi hotspots, where strict security is required to protect from malicious activity. Most personal firewalls will prompt the user when a new network is connected for the first time to decide the level of trust, and can set individual security policies for each network. Unlike network firewalls, many personal firewalls are able to control network traffic allowed to programs on the firewalled computer. When an application attempts an outbound connection, the firewall may block it if blacklisted, or ask the user whether to blacklist it if it is not yet known. This protects against malware implemented as an executable program. Personal firewalls may also provide some level of intrusion detection, allowing the software to terminate or block connectivity where it suspects an intrusion is being attempted. == Features == Common personal firewall features: * Block or alert the user about all unauthorized inbound or outbound connection attempts * Allows the user to control which programs can and cannot access the local network and/or Internet and provide the user with information about an application that makes a connection attempt * Hide the computer from port scans by not responding to unsolicited network traffic * Monitor applications that are listening for incoming connections * Monitor and regulate all incoming and outgoing Internet users * Prevent unwanted network traffic from locally installed applications * Provide information about the destination server with which an application is attempting to communicate * Track recent incoming events, outgoing events, and intrusion events to see who has accessed or tried to access your computer. * Personal Firewall blocks and prevents hacking attempt or attack from hackers 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Personal firewall」の詳細全文を読む スポンサード リンク
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