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The Best Damn Windows Server 2003 Book Period- P82:The latest incarnation of Microsoft’s server product,Windows Server 2003, brings many new features and improvements that make the network administrator’s job easier.This chapter will briefly summarize what’s new in 2003 and introduce you to the four members of the Windows Server 2003 family: the Web Edition, the Standard Edition, the Enterprise Edition, and the Datacenter Edition. | 776 Chapter 22 Planning Implementing and Maintaining a Routing Strategy Figure 22.9 Segment Switching Media Access Domain Media Access Domain Port switching implies that each port on the switching hub is directly connected to an individual device. This makes the port and the device their own self-contained media access domain. All of the devices in the network still remain part of the same MAC broadcast domain. Figure 22.10 illustrates how the media access and MAC broadcast domains are configured in a port-switched LAN. Figure 22.10 A Port-switched LAN Layer 2 Switches Layer 2 switches operating at the Data Link layer can be programmed to respond automatically to a wide range of circuit conditions. By monitoring control and data events these switches automatically reroute circuits or switch to backup equipment as the need requires. These switches operate using physical network or MAC addresses. These switches will be fast but not terribly smart. They only look at the data packet to find out where it s headed. Planning Implementing and Maintaining a Routing Strategy Chapter 22 777 Layer 3 Switches Layer 3 switches operating at the Network layer are designed for disaster recovery service or more importantly for disaster avoidance .These network backup units are usually designed specifically to provide high levels of automation intelligence and security. Layer 3 switches use routing protocols such as RIP or OSPF to calculate routes and build their own routing tables. Layer 3 switches use network or IP addresses to identify locations on the network identifying the network location as well as the physical device. These switches are smarter than Layer 2 switches. They incorporate routing functions to actively calculate the best way to get a packet to its destination. Unless their algorithms and processor support high speeds though these switches are slower. Layer 4 Switches Layer 4 switches operating at the Transport layer allow network managers to choose the best method
