Chapter 3 – Characterizing the Existing Internetwork Characterizing the Network Infrastructure - Characterizing the infrastructure of a network: means developing a set of network maps and learning the location of major internetworking devices and network segments o Includes documenting the names and address of major devices and segments, and identifying any standard methods for addressing and naming, length of physical cabling and investigating architectural and environment constraints Developing a Network Map - Learning the location of major hosts, interconnections devices, and network segments is a good way to start developing an understanding of traffic flow o Your goal is to obtain a map of the existing network so that it is easy to create the new network Characterizing Large Internetworks - Developing a single network map might not be possible for large internetworks o Another approach is to apply a top-down method o Start with geographical information WAN(city to city)/LAN(building to building) connections o Network Address Translation (NAT) devices, Intrusion detection systems (IDS), and Intrusion Prevention System (IPS) - Complex networks is to use a top-down approach that is influenced by the OSI reference model - First develop a logical map that shows applications and services used by network users and after develop a map that shows network services o Terminal Access Controller Access Control System (TACACS) o Remote Authentication Dial-In User Service (RADIUS) servers.
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