CCIE Practical Studies Labs

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Today, a number of national service providers operate peer networks, and compete for the same market segment in the same geographical area (see Figure 1-8). Similar arrangements exist abroad. In the final year or so of the twentieth century, there has been a consolidation of players through mergers or buyouts—at least five major NSPs exist within the United States. Some smaller commercial and larger federal networks still maintain peer status with the Big Five NSPs, although this is likely to change in time.

Growth of Internet routing tables. Eventual exhaustion of the 32-bit IP address space. 54 It became evident that the first two problems needed to be addressed immediately. This led to the proposal of RFC 1519, which prompted slower growth of the Internet routing table by condensing groups of network addresses that fell within close range (called route aggregation). Route aggregation is performed similar to masking, which led to its other name, supernetting. With CIDR, the masks in the assigned address are grouped into one update.

For Further Reading … Black, Uyless. ISDN and SS7. Upper Saddle River, NJ: Prentice Hall, 1997. Comer, Douglas. Internetworking with TCP/IP, Volume 1. Upper Saddle River, NJ: Prentice Hall, 1991. Dickie, Mark. Routing in Today's Internetworks. New York, NY: John Wiley & Sons, 1994. Ford, Merilee (Editor), H. Kim Lew, Steve Spanier, and Tim Stevenson. InternetworkingTechnologies Handbook . Indianapolis, IN: Cisco Press, 1997. Halabi, Bassam. Internet Routing Architectures. Indianapolis, IN: Cisco Press, 1997.

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