【正文】 如果一個網(wǎng)站要求你安裝一個補(bǔ) 丁 ， 你在做之前必須相信它 。鏈接 (當(dāng)你點擊公開網(wǎng)站鏈接 )常常用來作為仿冒和間諜陷阱，但他們也可以傳播病毒。仿冒是實踐創(chuàng)造欺騙性電子郵件信息和網(wǎng)站以欺騙電腦用戶透露個人或財務(wù)信息。你不知道從未公開扣押別人 ， 如果你知道寄件人，但并沒有期待扣押，核實發(fā)送實際上發(fā)出扣押之前你打開它 ， 當(dāng)看到信任的電子郵件訊息 時 ， 就 避免電子郵件病毒 。但 是，插件也可以安裝間諜軟件或其他惡意軟件。 (4)小心點擊鏈接在電子郵件訊息。 (3)使用仿 冒過濾器 Inter Explorer。 (2)守衛(wèi)你的個人詳細(xì)資料。更新通常需要每年訂閱費 ， 保持現(xiàn)行認(rèn)購 以 接受定期更新。 如果人們發(fā)現(xiàn)的防毒程 序 或是檢疫或刪除，它完全是在破壞你的電腦檔案。病毒和蠕蟲可以 從一臺計算機(jī)上 復(fù)制 到另一臺 計算機(jī) 上 ，而特洛伊木馬病毒進(jìn)入電腦躲藏看似合法的程序，例如一個屏幕保護(hù)程序。 此看法好像在懷疑 “ 數(shù)字免疫系統(tǒng) ” 的設(shè) 想，而在過去幾年里安全界已經(jīng)在爭論這種數(shù)字免疫系統(tǒng)，但是，還有更重要的一點要考慮。因此，設(shè)想為提高生產(chǎn)率而使用它們僅僅只是邏輯上的，這非常像圣經(jīng)告誡讀者要化干戈為玉帛。根據(jù)對企業(yè)的網(wǎng)絡(luò)統(tǒng)計，病毒 被清除后， 85%的會在 30 天內(nèi)會被再次感染。受到病毒襲擊后，不但影響網(wǎng)絡(luò)正常的工作，而更可怕的是它會使網(wǎng)絡(luò)崩潰，破壞網(wǎng)絡(luò)中計算機(jī)的數(shù)據(jù)，使工作成果毀于一旦。如果還不行，低級格式化硬盤等措施總能將病毒徹底清除。不過在企業(yè)簡單的網(wǎng)絡(luò)環(huán)境下，病毒的傳播可以利用充分的介質(zhì)，通過簡單而快速的內(nèi)部網(wǎng)絡(luò)，病毒可以迅速地傳播，舉個例子：在常見的 100m 辦公網(wǎng)絡(luò)內(nèi)，只要有一臺工作站染毒，就可在幾十秒鐘內(nèi)將同一網(wǎng)絡(luò)中的數(shù)百臺計算機(jī)全部感染。 作為內(nèi)部網(wǎng)絡(luò)與外部公共網(wǎng)絡(luò)之間的第一道屏障，防火墻是最先受到人們重視的網(wǎng)絡(luò)安全產(chǎn)品之一。 自從 1986年美國 Digital公司在 Inter上安裝了全球第一個商用防火墻系統(tǒng)，提出了防火墻概念后，防火墻技術(shù)得到了飛速的發(fā)展。 沒 有你的知識 ， 部分防火墻也能防止其他人使用你的電腦攻擊其他電腦。 7 如果你的電腦是沒有保障，當(dāng)您連接到互聯(lián)網(wǎng)，黑客在您的計算機(jī)上可獲取個人資料。 （ 4） 應(yīng)用層包含應(yīng)用特定的 協(xié)議 ，像超文本傳輸協(xié)議 (HTTP)， 可以 統(tǒng)計 昂貴的特定應(yīng)用協(xié)議 的檢查 ，因為更多的數(shù)據(jù)需要加以檢查， 并有更多的國家所需。 （ 3） 運輸層提供了數(shù)據(jù)流之間的主機(jī)。 在 轉(zhuǎn)發(fā)包 以前，防火墻 可以修改數(shù)據(jù)包的內(nèi)容。 這一術(shù)語 來源于防火墻，防火墻作為防止火勢蔓延 的一道 屏障。與對等網(wǎng)絡(luò)相比，客戶機(jī)服務(wù)器網(wǎng)絡(luò)需要更多的集中管理和專門管理。在客戶機(jī)服務(wù)網(wǎng)絡(luò)中，服務(wù)器控制網(wǎng)絡(luò)的訪問和網(wǎng)絡(luò)的資源。s performance and stability. Antivirus programs scan and other files on your puter for viruses, worms, and Trojan horses. If one is found, the antivirus program either quarantines (isolates) it or deletes it entirely before it damages your puter and files. Because new viruses are identified every day, it39。s attention to the work security products in one. Although theoretically, firewall work security at the bottom, the work responsible for the security authentication and transmission, But with work security technology development and application of the work changes, Modern technology has gradually firewall to the work layer other than the safety level, not only to plete the traditional firewall filtering tasks, but also for the various works to provide the corresponding security services. In addition there is many other firewall products are moving towards data security and user authentication, antivirus and hacker intrusion direction. SMEs in the specific work environment, in addition to HIV and the birthright of transmissibility, enforceability, and conventional destructive virus in mon, but also have some other features: 1. Faster rate of infection The spread of the virus must be some means for the plete closure of the single case。s work, another demand gradually reveal themselves. That is the single transmission of information between. Computer works should be established as soon as possible on the agenda. Establish puter works main purpose is to realize a resource sharing that all work users can enjoy the puter systems of all or part of the resources. LAN are currently used to broadcast the technical basis for Ether, any two nodes of munication between the data packet is not only these two nodes by the card receipt, were also at the same Ether to the nodes of a work card by the interception, As long as hackers access to the Ether nodes for an interception, can capture the Ether in the data packet and all its packet analysis solution, thereby stealing critical information, This is the Ether inherent security risks. In fact, many on the Inter free of the hacking tools are put Ether interception as the most fundamental means. A firewall is a work device that enforces security policy for work traffic. The term originates from firewall, a fireproof wall used as a barrier to prevent the spread of fire. An Inter firewall creates a barrier between separate works by imposing a point of control that traffic needs to pass before it can reach a different work. A firewall may limit the exposure of hosts to malicious work traffic, ., 2 remote adversaries attempting to exploit security holes in vulnerable applications, by preventing certain packets from entering works protected by the firewall. When inspecting a work packet, a firewall decides if it should drop or forward the packet. The decision is based on a firewall39。s security policy a