So far, this chapter has covered technologies related to a permanent point-to-point leased line. Service providers also offer services that can be categorized as packet-switching services. In a packet-switched service, physical WAN connectivity exists, similar to a leased line. However, the devices connected to a packet-switched service can communicate directly with each other, using a single connection to the service.
Two types of packet-switching service are very popular today—Frame Relay and ATM. Both are covered in this chapter. At the end of the chapter, a summary section compares these types of networks with other types of WAN connectivity.
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