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The Cisco Secure PIX Firewall system is a high-end, dedicated hardware firewall device capable of protecting networks ranging in size from small offices to large enterprises At its heart, the Cisco PIX Firewall is simply a hardened PC with specialized firewall software The wide availability of the components used in the PIX Firewall allow the device to be competitively priced, while the specialized software image installed on it allows it to be free of security vulnerabilities common to firewall solutions running on top of commercially available general-purpose operating systems As for features, the PIX Firewall includes a number of features designed to secure your network from most threats The primary feature of the firewall is known as the Adaptive Security Algorithm (ASA), and it functions very similarly to the CBAC feature in the IOS Firewall, allowing connections established from the inside to function and denying attempts from the outside to intrude on a dynamic basis The PIX also supports hot standby, allowing redundant PIX Firewalls to fail over to one another with no user disruption Full NAT/PAT support is included, of course, as well as DOS suppression, and nearly every other feature in the IOS Firewall feature set is available The PIX Firewall is available in four models, all with differing performance and expansion capabilities The 506 is the entry-level model in the line, followed by the 515, 525, and 535 models The 506 firewall is designed primarily for branch offices It includes 32MB of DRAM, 8MB of flash RAM, and dual Ethernet (10 Mbps) NICs It can forward at up to 8 Mbps for unencrypted traffic, and at up to 6 Mbps using DES (56-bit) or 3DES (168-bit) encryption The 515 model is designed for situations requiring significantly higher performance and interface expandability, like large regional offices It includes either 32 or 64MB of DRAM, 16MB of flash RAM, dual 10/100 Mbps Fast Ethernet ports (expandable to a maximum of six), and a failover port for connection to a hot standby firewall It can forward at up to 145 Mbps for unencrypted traffic, and at up to 10 Mbps using DES or 3DES encryption Figure 13-7 shows an example of a PIX 515 model firewall.

This is a classic example of what s known as the Caesar cipher You just take the letters of the alphabet and transpose them:

size_type find_first_not_of( const CharType *str, size_type indx = 0) const;

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Figure 13-7: Front view of a PIX 515 firewall The 525 model is designed for enterprise networks that require no-compromises high performance It includes either 128 or 256MB of DRAM, 16MB of flash RAM, dual 10/100 Mbps Fast Ethernet ports (expandable to a maximum of eight), and a failover port It can forward at up to 320 Mbps for unencrypted traffic, and at up to 70 Mbps using DES or 3DES encryption Finally, the 535 model is designed for the most intense security duties in service provider or enterprise networks It includes either 512MB or 1GB of DRAM, 16MB of flash RAM, and a failover port It has no Ethernet ports included, but single and quad Fast Ethernet interfaces are available, as well as a single-port Gigabit Ethernet interface With eight total expansion slots, the 535 can support up to eight total Gigabit or Fast Ethernet interfaces As for performance, it can forward at up to 17 Gbps for unencrypted traffic, and at up to 95 Mbps using DES or 3DES encryption In the end, the PIX Firewall system is a platform supporting advanced network protection features required by many publicly accessible networks to prevent intrusion For more information on the PIX Firewall, please visit http://wwwciscocom/warp/public/cc/pd/fw/sqfw500/prodlit/indexshtml

Caesar ciphers are very easy to crack by using word patterns, frequency analysis, or brute force The code WKH shows up twice, which means it s the same word (word patterns) We also see the letters W and H show up fairly often Certain letters of the alphabet are used more than others, so a code-breaker can use that to help decrypt the code (frequency analysis) Assuming that you know this is a Caesar cipher, a computer can quickly go through every different code possibility and determine the answer (brute force) Incredibly, even though it s not as obvious, binary code also suffers from the same problem In computing you need to make a cipher hard for anyone to break except the people you want to read the data Luckily, computers do more complex algorithms very quickly (it s just math) and you can use longer keys to make the code much harder to crack Okay, let s take the information above and generate some more symbols to show this process When you run cleartext through a cipher algorithm using a key, you get what s called ciphertext (Figure 11-2)

Summary

Table 36-1

This chapter examined the other lines of Cisco products, from access servers to security, and detailed the benefits of each product in Cisco's lineup This is the final chapter detailing product lines In the next chapter, you will begin to learn about the intricacies of the Cisco IOS

Over the years, computing people have developed hundreds of different complete algorithms for use in encrypting binary data Of these, only a few were or still are commonly used in the TCP/IP world The math behind all of these complete algorithms is incredibly complex, and way outside the scope of the CompTIA Network+ exam, but all of them have two items in common: a complex algorithm underlying the cipher, and a key or keys used to encrypt and decrypt the text Any encryption that uses the same key for both encryption and decryption is called symmetric-key encryption or a symmetric-key algorithm If you want someone to decrypt what you encrypt, you have to make sure they have some tool that can handle the algorithm and you have to give them the key This is a potential problem I will address later in this chapter

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