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4.8 out of 5 stars
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on 24 January 2000
Jeff does an excellent job of explaining some pretty heavy topics in an easy to read way. He seems to have the knack of starting something simple, but not so simple that experienced people lose interest, and bringing in the extra points at just the right moment. I only wish I had found this earlier. A technical book that is not out to baffle the reader with the authors brilliance is a rare and welcome change. I onywish I found it earlier! A book I was happy to buy out of my own pocket, so that it does not belong to the company, it belongs to ME!
Paul, CCIE4063, preparing for re-certification.
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on 16 January 2002
Truly the don. So long as you don't need BGP (covered in vol II & Halabi's BGP bible) then this rocks. Section 1 covers the basics, and well. Section 2 is a fairly exhaustive guide to IGP protocols which is not bettered anywhere. Although the ISIS chapter lacks a little in the way of fine-tuning tips its still the best I've seen and the other sections most relevant nowadays (OSPF, RIP2, EIGRP) are also great. The detail required for CCIE prep and effective understanding for large-scale network design and troubleshooting is all here. Section III is a vital guide to the nuances of policy-based routing and route-redistribution.
Aside from MPLS, along with vol II this provides the bomdiggy of routing reference.
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on 8 March 1999
This is the best book I've read on IGP Routing Protocols and their implementation on Cisco Routers. The book takes a reader from basic IP routing fundamentals through to in-depth implementation of the most complex IGP routing protocols. The book is easy to read and flows in very logical manner. I especially enjoyed the chapter (8) on Cisco's EIGRP; It was the most detailed coverage I have read on Cisco's proprietary Interior routing protocol.
Additional Comments:
I did note the following errors in the books print listed by chapter:
Chapter 5
Page 193, Paragraph 1, Sentence 4 and 5
The statement with regard to holddown timers and Routers running RIP routers is false. The statement read "If an advertised hop count is higher than the recorded hop count and the update was received was originated by the recorded next-hop router, the route will be marked as unreachable for a specified holddown period. If at the end of that time the same neighbor is still advertising the higher hop count, the new metric will be accepted". The reason this is wrong is because, a router that receives a route with a higher metric than the currently recorded metric and the advertising router is also the recorded next-hop router, the router will immediately install the new metric. (lab tested).
Appendix F
Page 970, Chapter 7, Answer 1
The given answer is not completely correct as stated. First the answer states that the router labeled C on page 321 and who's configuration is on page 324 will interpret the RIPv2 routes and coming from routers A and B respectfully as and discards them because this route is directly connected to one of router C's interfaces. This is incorrect first because the routes that will be advertised by routers A and B will be and respectfully not and Secondly because router C is configured with the default rip settings, which allows the router to advertise RIPv1 and receive RIPv1 and RIPv2, which will allow router C to correctly interpret the masks sent with the RIPv2 updates sent by routers A and B as such router C will have both (Lab Tested).
Appendix C, Chapter 11, Answer 1
The answer as stated is not completely correct. The answer states that in order to redistribute between the IGP domain and the RIPv1 domain the router labeled B should have its mask changed from /27 to /28. Although this facilitates the routes from the IGRP domain into the RIPv1 domain it does not completely facilitate the reverse. The reason for this is that when router B receives the RIPv1 updates from router C it interprets those routes to have a /28 mask due to the new mask on its E1 interface. This results in the IGRP domain believing that the subnets in the RIPv1 domain have only 14 hosts per subnet where as they really can have as may as 30 hosts. In example take the subnet which possibly contains hosts -62 in the RIP domain, when this route is redistributed into the IGRP domain it would be interpreted to only contain hosts This would cause packets originating in the IGRP domain destined for the hosts numbered to be returned unreachable by the routers in the IGRP domain without further configuration. i.e. static routes.
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on 25 January 2000
A book for engineers. The examples are real and are easy to follow. Topics are made easy even for beginners with some hands-on. A good reference to keep, and to carry with you around even though it is bulky.
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on 10 August 1999
Without doubt the most positive experience I've had when it comes to networking books. Very well written, taking you through in-depth knowledge in a way that really lets you understand the inner workings without unnecessary tech-talk. This is a must-read for all networking professionals, whether they are trying for CCNA, CCNP or CCIE certifications, or just want to gain networking knowledge. Get it now!
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on 19 November 1998
As an CCIE, I found this book is very informative and very accurate. It disects the details of the routing protocol, including IS-IS. How many books out there do you see that talk about IS-IS? If you want to gain basic and advance about default route, static routing, IGRP, EIGRP, OSPF, ISIS, this is the bible for you. With Sam Halibi's book and this book, you will probably solidfy your preparation for CCIE lab test. Of course, with lots and lost of hands on practice. But you need these two books for practicing! Good luck!
p.s. I just wished I had these books when I was studying for my CCIE. It would save me lots of time!!!!!
Rob CCIE# 3xxx (Sorry! for privacy!)
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on 7 February 1999
In my opinion, this book is the bottom line as far as TCP/IP goes. Clear and detailed explanations of so many topics I've wondered about before, but have been glossed over by others, and indeed by Cisco's own training courses. It's the definitive reference book, and a godsend to anybody troubleshooting TCP/IP on cisco networks. And frankly, even if you're not using Cisco products you could do worse than to learn that bit extra about how TCP/IP actually works.
If you use TCP/IP with Cisco routers, you'd be foolish not to add this to your collection and read it thoroughly.
All I'm waiting for now is Volume II....!
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on 2 December 1998
If you're confused as to which of the Cisco books to purchase (especially given the fact that several cover exactly the same material and some are just printed copies of the CD), this is the one to buy. I have all the classics and this is one of my favorite books. Things that I read about before but did not quite understand are clearly explained in this book. Things that I'd never heard of before and am surprised I missed are in this book. If you're preparing for CCIE or just want to know more about routing (with Cisco or not), I can't imagine a better book to start with.
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on 20 June 1999
This is the first TCP/IP book I've read that really explained how a packet is routed from source to destination, and made it easy to understand. After reading this book, I now have a greater appreciation for what my friends in the Network Control Center team have to work with everday. If you have any trouble understanding how to subnet an address space, you won't by the time you finish Chapter 2. As an MCP NT admin working in a Fortune 500 7x24 command center, I think this book should be required reading for anyone working with a TCP/IP network. This is a really great book!
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on 1 February 2003
Jeff Doyle has a sense of humour. In a book this thick, containing this much technical information, that in itself is reason to buy this book. He can make a dry topic sound interesting, and has the (scarce) ability to make technically challenging subjects relatively easy for the reader to comprehend (his analogies are excellent). I have had this book for 3yrs now, and still refer to it on average at least once a week. Buy this book (and part2) along with Kennedy Clarks Switching book, and the CCIE is a stones throw away.
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