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WAN connections consist of three types: circuit-switched such as modems and ISDN, dedicated or leased lines, and packet-switched such as ATM and Frame Relay. Choosing the correct LAN type depends on many factors, including bandwidth required, cost of that type, and availability of that type. To choose the correct Cisco device, the site must be identified. If it is a central site where the headquarters reside, then Cisco products to be used include the 7000 series, the AS5000 series, the 4000 series, and the 3600 series. If the site is a branch office with fewer users, the products that can be used include the 2600, 2500, 1720, and 1600 series routers. Finally, for sites that are identified as telecommuter or SOHO sites, routers can include the 1000, 800, and 700 series. Identifying the correct device must be done while keeping future growth requirements in mind. Summary

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