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| Internet 的發(fā)展為企業(yè)、政府和專用網(wǎng)絡(luò)帶來(lái)了更大的安全風(fēng)險(xiǎn)。現(xiàn)有的解決方案如運(yùn)行在應(yīng)用層的基于代理的防火墻具有很多限制條件，包括性能低、需要昂貴的通用平臺(tái)、使用開(kāi)放系統(tǒng)如UNIX時(shí)本身具有安全風(fēng)險(xiǎn)等。而Cisco Secure PIX防火墻能夠提供空前的安全保護(hù)能力，它的保護(hù)機(jī)制的核心是能夠提供面向靜態(tài)連接防火墻功能的自適應(yīng)安全算法（ASA）。靜態(tài)安全性雖然比較簡(jiǎn)單，但與包過(guò)濾相比，功能卻更加強(qiáng)勁；另外，與應(yīng)用層代理防火墻相比，其性能更高，擴(kuò)展性更強(qiáng)。 ASA可以跟蹤源和目的地址、傳輸控制協(xié)議（TCP）序列號(hào)、端口號(hào)和每個(gè)數(shù)據(jù)包的附加TCP標(biāo)志。只有存在已確定連接關(guān)系的正確的連接時(shí)，訪問(wèn)才被允許通過(guò)Cisco Secure PIX防火墻。這樣做，內(nèi)部和外部的授權(quán)用戶就可以透明地訪問(wèn)企業(yè)資源，而同時(shí)保護(hù)了內(nèi)部網(wǎng)絡(luò)不會(huì)受到非授權(quán)訪問(wèn)的侵襲。另外，實(shí)時(shí)嵌入式系統(tǒng)還能進(jìn)一步提高Cisco Secure PIX防火墻系列的安全性。雖然UNIX服務(wù)器是廣泛采用公開(kāi)源代碼的理想開(kāi)放開(kāi)發(fā)平臺(tái)，但通用的操作系統(tǒng)并不能提供最佳的性能和安全性。而專用的 Cisco Secure PIX防火墻是為了實(shí)現(xiàn)安全、高性能的保護(hù)而專門設(shè)計(jì)。 |
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PIX系列下各型號(hào)配制及報(bào)價(jià) |
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型號(hào) |
配置描述 |
價(jià)格(美金) |
| PIX-501-50-BUN-K9 |
PIX 501-50 3DES/AES Bundle (Chassis, SW, 50 Users, 3DES/AES) |
1690 |
| PIX-501-BUN-K9 |
PIX 501-10 3DES/AES Bundle (Chassis, SW, 10 Users, 3DES/AES) |
1190 |
| PIX-501-UL-BUN-K9 |
PIX 501-UL Bundle (Chassis, SW, Unlimited Users, 3DES/AES) |
1990 |
| PIX-506E-BUN-K9 |
PIX 506E 3DES/AES Bundle (Chassis, SW, 2 FE Ports, 3DES/AES) |
2790 |
| PIX-535-AA-GE-BUN |
PIX 535 FO-AA Bun (SW, Act/Act FO Lic, VAC+, 3 GE+2FE, 2 AC) |
54000 |
| PIX-535-FO-GE-BUN |
PIX 535-FO-GE Bundle (Chassis,Failover SW,3 GE+2 FE,VAC+) |
34000 |
| PIX-515E-AA-FE-BUN |
PIX 515E FO-AA Bundle (SW, Act/Act FO License, VAC+, 6 FE) |
11000 |
| PIX-515E-DC-FO-BUN |
PIX 515E-FO DC Bundle (Chas, Failover SW, 128MB, 2 FE, VAC+) |
8000 |
| PIX-515E-DC-R-BUN |
PIX 515E-R DC Bundle (Chas, Restricted SW, 64MB, 2 FE Ports) |
8990 |
| PIX-515E-DC-UR-BUN |
PIX 515E-UR DC Bundle (Chas,Unrestricted SW,128MB,2 FE,VAC+) |
15990 |
| PIX-515E-FO-BUN |
PIX 515E-FO Bundle (Chas, Failover SW, 128MB, 2 FE, VAC+) |
6000 |
| PIX-515E-FO-FE-BUN |
PIX 515E-FO-FE Bundle (Chas, Failover SW, 128MB, 6 FE,VAC+) |
7000 |
| PIX-515E-R-BUN |
PIX 515E-R Bundle (Chas, Restricted SW, 64MB, 2 FE Ports) |
6990 |
| PIX-515E-R-DMZ-BUN |
PIX 515E-DMZ Bundle (Chas, Restricted SW, 64MB, 3 FE Ports) |
7390 |
| PIX-515E-DMZ-CSA-K9 |
Cisco Security Starter Bundle PIX 515E-R-DMZ, CSA, VMS Basic |
10990 |
| PIX-515E-UR-BUN |
PIX 515E-UR Bundle (Chas, Unrestricted SW, 128MB, 2 FE,VAC+) |
10493 |
| PIX-515E-UR-FE-BUN |
PIX 515E-UR-FE Bundle (Chas,Unrestricted SW,128MB,6 FE,VAC+) |
11243 |
| PIX-525-AA-GE-BUN |
PIX 525 FO-AA Bundle (SW, Act/Act FO Lic, VAC+, 2 GE+2FE) |
19000 |
| PIX-525-FO-BUN |
PIX 525-FO Bundle (Chassis, Failover SW, 2 FE Ports, VAC+) |
10000 |
| PIX-525-FO-GE-BUN |
PIX 525-FO-GE Bundle (Chassis,Failover SW,2 GE+2 FE,VAC+) |
12000 |
| PIX-525-R-BUN |
PIX 525-R Bundle (Chassis, Restricted SW, 2 FE Ports) |
13493 |
| PIX-525-UR-BUN |
PIX 525-UR Bundle (Chassis,Unrestricted SW,2 FE Ports,VAC+) |
19493 |
| PIX-525-UR-GE-BUN |
PIX 525-UR-GE Bundle (Chassis,Unrestr. SW,2 GE+2 FE,VAC+) |
20993 |
| PIX-535-FO-BUN |
PIX 535-FO Bundle (Chassis, Failover SW, 2 FE Ports, VAC+) |
18000 |
| PIX-535-R-BUN |
PIX 535-R Bundle (Chassis, Restricted SW, 2 FE Ports) |
35993 |
| PIX-535-UR-BUN |
PIX 535-UR Bundle (Chassis, Unrestricted SW, 2 FE, VAC+) |
41993 |
| PIX-535-UR-GE-BUN |
PIX 535-UR-GE Bundle (Chassis,Unrestr. SW,3 GE+2 FE,VAC+) |
65990 |
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