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Large networks are complex systems, with many interdependent devices held together only by the strength of the network designer's specifications. It takes a lot of knowledge--and a lot of time--to make sure that the capacity of links and nodes is neither wasted nor overloaded. Designing Large-Scale LANs explains how the pieces of a large local area network (LAN) interoperate. A LAN, in author Kevin Dooley's working definition here, is a building-size data network, or perhaps a campus-size system with a backbone running Gigabit Ethernet, ATM, or FDDI. Dooley does a good job of teaching his readers about, for example, the processing overhead involved in address translation or protocol tunneling, and why techniques like those should be used sparingly in a LAN that needs to be fast and efficient.

That said, Dooley spends a lot of time on network fundamentals. He explains subnet masking in his own rather appealing way, and takes readers on a tour of the Open Systems Interconnect (OSI) seven-layer model. He explains the function of split horizon and poison reverse in Routing Information Protocol (RIP), as well as the improvements more modern routing protocols make on RIP. In short, there's an awful lot of background information here. Designers of big networks need to understand this stuff, but you might expect to see comparisons of competing vendors' equipment here--there's not enough of that--and less broad, conceptual information. On the other hand, you could do far worse than to study this book in preparation for a networking certification exam. --David Wall

Topics covered: How to design a resilient, fast, and efficient local area network (LAN). Vendor-neutral to a fault, this book explains the relative merits of LAN media and topologies, and goes into detail on how to design an addressing scheme for routing efficiency. An appendix on the mathematics of combining probabilities (e.g., the probability that both this router and that switch will fail at the same time) is a nice touch.

Product Description
This unique book offers a vendor-neutral approach for designing large local area networks according to business or organizational needs, rather than from a product perspective. Author and independent network design consultant Kevin Dooley outlines "top-down network design" for building a technological infrastructure to fit your organization's requirements, a process far more effective and cost-efficient than fitting the organization to the parameters of a shrink-wrapped proprietary solution.

Dooley argues that the design of a network is largely independent of the products used. Whether you use a Cisco or Juniper router, the same security issues and protocols apply. The questions he addresses in this book are need-specific: Do I use a router or a switch? Should I route between switched areas or switch between routed areas?

"Designing Large-Scale LANs" covers everything from security, bandwidth and scalability to network reliability, which includes backup, redundancy, and points of failure. Specific technologies are analyzed in detail: network topologies, routing and switching strategies, wireless, virtual LANs, firewalls and gateways, security, Internet protocols, bandwidth, and multicast services. The book also discusses proprietary technologies that are ubiquitous, such as Cisco's IOS and Novell's IPX.

This complete guide to top-down network design will help you choose the right network solutions. If you're designing large scale networks and need expert advice and guidance, look no further than "Designing Large-Scale LANs,"

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