51154724-100防火墻指的是一個(gè)由軟件和硬件設(shè)備組合而成、在內(nèi)部網(wǎng)和外部網(wǎng)之間、專用網(wǎng)與公共網(wǎng)之間的界面上構(gòu)造的保護(hù)屏障.是一種獲取安全性方法的形象說(shuō)法，它是一種計(jì)算機(jī)硬件和軟件的結(jié)合，使Internet與Intranet之間建立起一個(gè)安全網(wǎng)關(guān)（Security Gateway），從而保護(hù)內(nèi)部網(wǎng)免受非法用戶的侵入，防火墻主要由服務(wù)訪問(wèn)規(guī)則、驗(yàn)證工具、包過(guò)濾和應(yīng)用網(wǎng)關(guān)4個(gè)部分組成，防火墻就是一個(gè)位于計(jì)算機(jī)和它所連接的網(wǎng)絡(luò)之間的軟件或硬件。該計(jì)算機(jī)流入流出的所有網(wǎng)絡(luò)通信和數(shù)據(jù)包均要經(jīng)過(guò)此防火墻。
防火墻的功能主要在于及時(shí)發(fā)現(xiàn)并處理計(jì)算機(jī)網(wǎng)絡(luò)運(yùn)行時(shí)可能存在的安全風(fēng)險(xiǎn)、數(shù)據(jù)傳輸?shù)葐?wèn)題，其中處理措施包括隔離與保護(hù)，同時(shí)可對(duì)計(jì)算機(jī)網(wǎng)絡(luò)安全當(dāng)中的各項(xiàng)操作實(shí)施記錄與檢測(cè)，以確保計(jì)算機(jī)網(wǎng)絡(luò)運(yùn)行的安全性，保障用戶資料與信息的完整性，為用戶提供更好、更安全的計(jì)算機(jī)網(wǎng)絡(luò)使用體驗(yàn)。
總的來(lái)說(shuō)，防火墻是在兩個(gè)網(wǎng)絡(luò)通訊時(shí)執(zhí)行的一種訪問(wèn)控制尺度，是網(wǎng)絡(luò)安全策略的有機(jī)組成部分，只有通過(guò)防火墻的安全策略審核，內(nèi)外部網(wǎng)絡(luò)之間的通訊資源請(qǐng)求才能被允許通過(guò)。

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51154724-100 Firewall refers to a combination of software and hardware devices, constructed at the interface between the internal network and the external network, between the private network and the public network. It is a combination of computer hardware and software that establishes a Security Gateway between the Internet and the Intranet, thereby protecting the Intranet from intrusion by illegal users. Firewall consists of service access rules, authentication tools, packet filtering and application gateway. Firewall is a software or hardware located between a computer and the network it is connected to. All network traffic and packets flowing in and out of the computer pass through this firewall.
The function of the firewall is to discover and deal with the security risks and data transmission problems that may exist during the operation of the computer network in a timely manner. The processing measures include isolation and protection. At the same time, the firewall can record and detect the operations of the computer network security to ensure the security of the computer network operation and ensure the integrity of user data and information. To provide users with a better and more secure computer network experience.
In general, the firewall is an access control scale executed when two networks communicate, and is an integral part of the network security policy. Only through the security policy audit of the firewall, the communication resource request between the internal and external networks can be allowed to pass.

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