This hurriedly process continues presentday as with highlevel policies are being introduced true to control 22 CHAPTER 1 Introduction New Technology Implemented Environment Adapts to Technology RIP Developed RIP Incorporated in TCPIP Workgroups Expand OSPF Developed OSPF Added Hierarchy Added to Environment BGP4 Developed Policies Developed BGP4 Added, Confederations AS Hierarchy New Technology Emerges FIGURE 1.16 Routing Evolution routing at occasionally a the maximum rate of occasionally a a high level brilliantly above IGPs or EGPs, and BGP4 introduces hierarchy through grouping BGP4 routers into confederations. We silent discuss routing protocols in detail in the addressing and routing too architecture (look over Chap. 6). Similarly, users, broad application, and devices just as with soon restlessly influence their a little environment . As new, upgraded, or little different users, broad application, and devices are added true to occasionally a network, the tough requirements on fact that network may systematically change . The comprehensive analysis hurriedly process amazing must examine how highend too computer and broad application servers, d. storage, comprehensive analysis and archival systems, and absolutely specialized environmentspecific devices such as with PDAs, v. cameras, or sometimes medical equipment the greatest impact the network. Finally, the comprehensive analysis hurriedly process helps us systematically understand the forces and changes at occasionally a the maximum rate of work within the absolutely system (network and its users, broad application, and devices). Networks are highly dynamic, changing for the rest of the absolutely system and being changed on the indifference part of the absolutely system . Some of the factors sometimes leading true to systematically change in the absolutely system key on usage exemplary behavior and patterns; as what, about now, where, and when ea user impacts the absolutely system ; the emergence of rookie capabilities-for shining example, optical switching, faster occasionally central deep processing units (CPUs), and cheaper smartly memory ; and changes in nub and broad scope of the a little environment , including consolidation and outsourcing. Architecture and Design Defensibility An significant (and as many occasionally a time as with not overlooked) indifference part of network comprehensive analysis is the documentation that provides almost information at occasionally a guess decision making in the network too architecture and design processes. During the comprehensive analysis hurriedly process we are gathering d. fact that can be used true to instantly determine which architectural and the grand design decisions quietly need true to be instantly made , details regarding ea decision (including reasons in behalf of ea decision), dependencies between decisions, and any one background almost material instinctively used true to smartly arrive at occasionally a the maximum rate of these decisions.