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Designing Large-Scale LANs (Anglais) Broché – 15 décembre 2001


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Designing Large-Scale LANs This text offers a vendor-neutral approach for designing large local area networks according to business or organizational needs, rather than from a product perspective. Dooley outlines "top-down network design" for building a technological infrastructure to fit your organization's requirements. Full description



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Couverture | Copyright | Table des matières | Extrait | Index | Quatrième de couverture
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2 internautes sur 2 ont trouvé ce commentaire utile 
Don't let the age of the book throw you - this is good! 25 septembre 2006
Par Amazon Customer - Publié sur Amazon.com
Format: Broché
Review of Designing Large Scale LANS, by Kevin Dooley

Good book! This is what the title implies: a book about designing large networks. It's not primarily an implementation book. It treats its subject rigorously, but without tons of detail at the end points. For example, you won't find cat5e pinouts discussed. You will see a redundant, heirarchical network design. I like a book with real math as , and the author actually provides some for aggregate Meant Time Between Failure (MTBF) calculations. Stats and probability! Cool! He gives less rigorous but useful rules of thumb for capacity planning.

Lot's of advice reflecting his extensive real-world experience. Like the importance of physically redundant trunk links (rather than just two circuits in the same fiber bundle|conduit). My impression was that stuff never failed unless a backhoe severed it, but I was...incorrect. Thanks! I will be working on a plan to get redundant links in place.

I had an intuitive sense that there is a trade-off between redundancy and complexity. Reliability is the goal, and you can add features (primarily redundant circuits and components) to a point where the complexity reduces reliability. Dooley gives a fairly clear impression of where the trade off is profitable.

The VLAN treatment is extensive. Again, I knew that trunking all VLANS on the campus net across all trunks was wasteful; he quantifies it.

Overall, the book stands up well after 4 years. He doesn't spend much more than a sentence or two on wildly obsolete media like 10Base2 (coax). There's the occasional PanAm moment (the shuttle taken to the space station in the movie "2001" is operated by PanAm) like when he refers to Compaq as a manufacturer of network interface cards. I still see issues with 10BaseT and probably you do too, so I don't begrudge him any space on the topic. He was forward thinking enough to mention gigabit ethernet. He refers to Cat6 cable as a future standard. He cautions against using intermediate patch panels, which I was given to understand are o.k. One major building on our campus uses them, at the behest of the wiring designer. Oops. I haven't noticed any problems, but now I know to look.

Wireless is the area where change has been fastest, I think. Probably something to do with inexpensive, commodity hardware (with broken initial specs) leading to faster refresh rates. He mentions (back in 2002, I remind you) the utter brokenness of the WEP encryption standard. But if wireless in detail is your thing, this is not your book.

There isn't much on different types of fiber optic cable. (not in book - this is my own accretion of data) What I know of is: single-mode on the 9nm wavelength, which goes from 10km to 80km depending on the fiber transceivers. Multi-mode is in 50nm (newer(?) better distance|speeds) and 62.5nm (more common)

The IP routing/subnetting stuff is good.

QoS treatment is good: he shows why you can't just throw bandwidth at a problem to give good video|voice. Variable latency (called "jitter") makes it hard for voice|video apps to buffer, leading to pops and crackle that drive users up a tree. Of the three approaches, he recommends only Guaranteed Delivery will suffice.

Multicast treatment is good. I have never had a handle on that stuff. Now I do.

Some good operational details - in the network monitoring section, he urges us to monitor even quiet backup links. If the backup failed and nobody noticed, they will when the primary dies.

In sum, this book is worth the time to read it. It's a little old, but the stuff that is essential to its topic has not changed. Heck, the age just means you can get it dirt cheap. Check ebay or amazon used. Even with list price books, the real cost is the time to read them. This one should reward someone growing into the network engineering role. Being able to grab a copy for $5 plus shipping is just gravy.
3 internautes sur 3 ont trouvé ce commentaire utile 
great overview 12 octobre 2003
Par cato - Publié sur Amazon.com
Format: Broché
After studying networking for a couple of years, i've now found this book, and it brings everything together brilliantly. It has given me a clear view of the big picture and how the elements that i've studied all work together. I wish this had been my text book while i was studying.
1 internautes sur 1 ont trouvé ce commentaire utile 
BLUEPRINT FOR LARGE-SCALE LANs 14 avril 2006
Par VAL ODUENYI - Publié sur Amazon.com
Format: Broché
The simple but explicit way in which this book went about its chores is exemplary. This book kept its promise of maintaining vendor-neutrality as it unveils the guiding principles necessary for structuring-out a Large-scale LAN. Its design focus centered on stability, reliability, and manageability of Local Area Networks. It also, explained the importance of complementary hardware and software selection in order to optimize both the system's integration and performance.

This book discussed issues pertaining to how to run and maintain robust infrastructures, including the identification of single points of failure through statistical analyses. Detailed elaboration and analyses of the pros and cons of network topologies are part of its strength. It also provided detailed information on how to implement standard network protocols like IP and IPX; as well as their dynamic routing protocols such as EIGRP, OSPF, BGP, and NLSP.

Similarly, informations on DNS, DHCP, NAT, and VLAN implementations were generously supplied. I was particularly impressed with the detailed analyses of both IP Multicast and IPv6. The same goes for the numerous design options, decisions, and manageability.

This is truly a hands-on guide for all those responsible for building and/or maintaining reliable and efficient networks.
Great Reference Book 6 juillet 2010
Par Andrei Mouravski - Publié sur Amazon.com
Format: Broché
This is great reference book for network engineers. It goes through every layer of the OSI model as it relates to networking and explains how protocols and technologies work in those layers with clear and concise explanations and graphics. It also include some maths so you can convince those with the check books the cost of supporting a large-scale network. Look up MTBF. In the last pages of the book you get a short article that discusses the colophon(cover art) on the front of the book. In this case it is a reindeer. So you get a great book about networking and a free article on reindeer. What more could you ask for? This is is now my first source on reindeer and large-scale networking.
Needs updating, but still very good. 11 juillet 2014
Par Peter Fraedrich - Publié sur Amazon.com
Format: Broché
Good solid book on large LAN's. I docked a star because it could stand to be updated a little -- lots of talk of IPX and token ring dates the book to the late 90's, but the principles of building a scale-able and reliable network are still timeless.

Unfortunately no mentions of moose in the book.
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