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Cable modems connect using coax cable to a head end, similar to a telephone company s central office Head ends in turn connect to the cable company s network This network uses a unique protocol called Data Over Cable Service Interface Specification (DOCSIS) Most recently, the specification was revised (DOCSIS 30) to significantly increase transmission speeds (this time both upstream and downstream) and introduce support for Internet Protocol version 6 (IPv6) NOTE Many companies sell routers with a built-in cable modem

several others on the market Since all traffic must traverse a firewall when traveling from the secure network to the unsecure network (or vice versa), high throughput is critical The heart of the Cisco PIX Firewall is the Adaptive Security Algorithm (ASA) ASA is a protection scheme that compares packets to entries in a table, similar to packet filtering in router access lists However, ASA is more robust and dynamic than packet filtering As in the access-list operation, each packet is compared against a predefined set of rules These rules can contain Source IP address Destination IP address Protocol TCP port numbers or application Access is permitted only if an appropriate rule exists to validate that packet Once the initial packet has been validated, ASA creates a dynamic entry in the list of rules This entry can include Source IP address Destination IP address Randomized TCP sequence numbers Additional TCP flags This dynamic rule now satisfies a stateful, connection-oriented session flow of traffic As long as the session exists, the dynamic set of rules will continue to exist and be updated After the last packet traverses the PIX Firewall, ASA removes the dynamic rule from its rules table

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It s hard to tell a cable modem from a DSL modem The only difference, other than the fact that one will have cable modem printed on it while the other will say DSL modem, is that the cable modem has a coax and an RJ-45 connecter while the DSL modem has an RJ-11 and an RJ-45 connector Cable modems have proven themselves to be reliable and fast and have surpassed DSL as the broadband connection of choice in homes Cable companies are also aggressively marketing to business customers with high-speed packages, making cable a viable option for businesses

Cut-through proxy allows a user to be initially validated at the firewall, where they are permitted access to any TCP- or UDP-based application A proxy server analyzes every data packet at the application layer of the OSI model This takes time and processing cycles In contrast, the Cisco PIX Firewall queries a TACACS+ or RADIUS database server for authentication, checks and validates the user, and then allows traffic flow directly between the two parties while the session state information is maintained This cut-through proxy capability (see Figure 14-11) allows the Cisco PIX Firewall to perform dramatically faster than proxy servers

Living in the countryside may have its charms, but getting high-speed Internet access is tough For those too far away to get anything else, satellite may be your only option Satellite access comes in two types: one-way and two-way One-way means that you download from satellite but you must use a PSTN connection for uploads Two-way means the satellite service handles both the uploading and downloading Satellite isn t as fast as DSL or cable modems, but it s still faster than PSTN Both one-way and two-way satellite connections provide around 500 Kbps download and 50 Kbps upload Satellite requires a small satellite antenna, identical to the ones used for satellite television This antenna connects to a satellite modem, which in turn connects to your PC or your network (Figure 14-28)

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URLs (Universal Resource Locators) are the addresses of the various Web sites hit by every outbound Web connection These addresses can be stored in log files on the PIX Firewall, which can then be used to monitor your users' Web hits Although the PIX Firewall does provide this URL logging capability, it does not directly provide URL filtering For URL filtering, Cisco has established a relationship with NetPartner's WebSENSE server software This software runs on a Windows NT or UNIX server located on your internal network All