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Network Warrior by Gary A. Donahue
Book Summary InformationAuthor: Gary A. Donahue Edition: Paperback Format: Illustrated Published: 2007-06-21 ISBN: 0596101511 Number of pages: 598 Publisher: O'Reilly Media, Inc.
Book Reviews of Network WarriorBook Review: Great Cisco networking book. Every sys admin should have it. Summary: 4 StarsThis is a great book on Cisco networking, so just buy it now. I've tried reading the CCNA prep books before but never got around to finishing them because they got into too much detail and I wasn't working with Cisco products enough to get hands-on experience.
At my current job I'm more involved in networking, so when I saw this book, I thought I'd give it a shot. So far it's been very helpful. This book is strictly practical in nature, so you won't get a lot of detail on Ethernet framing or the OSI model. (Note to author, it would be helpful in the second edition to include one concise chapter on the OSI model and network protocols as a refresher.)
If you have a certification such as MCSA, MCSE, Network+, or CCNA, you will have all the background info you need before reading this book. If you have no networking knowledge at all, this book is not for you.
I've been skipping around reading different chapters (this is the kind of book where you can do that). This is one of the few IT book that I've read that actually gave me practical info that I could put to use right away. Here are two examples:
1.) From Ch 2 regarding auto-negotiation: In June 2008 we moved to a new office that had all new gigabit Cisco switches that replaced our 10/100 switches. A few weeks after our move we started getting reports of errors when saving files to our EMC Celerra NAS. Users would get errors saving files to the NAS and their computers' system logs would report a "Delayed Write Failed" error.
Source: MRxSmb
EventID:50
{Delayed Write Failed} Windows was unable to save all the data for the file \Device\LanmanRedirector
The data has been lost. This error may be caused by a failure of your computer hardware or network connection. Please try to save this file elsewhere.
This looked to be a network issue so when I was poking around the Celerra Manager I noticed that its NICs were hard coded to 100 full duplex. Since we were on gigabit switches that were set to auto-negotiate, I deduced (from the knowledge gained in this chapter) that the EMC devices should be set to auto-negotiate as well. So after contacting EMC and then changing the EMC NICs to auto-negotiate, we've had no more reports of these errors.
2.) From Ch 9 regarding routing: I ran into an issue with improper configuration of the gateway of last resort during our office move. For whatever reason, the gateway of last resort was not configured on our new VLANs. We noticed the problem because we couldn't get to the Internet, but we could get to our other offices. When our network support vendor walked my manager through running the sho ip route command, I immediately saw "gateway of last resort is not set" at the top and knew that it was the issue. So even though I had only been reading this book for two weeks, it paid off. I'm sure the vendor would have found the issue after a few more minutes, but it was nice to be able to point out the issue to them.
Summary of Network WarriorWritten by networking veteran with 20 years of experience, Network Warrior provides a thorough and practical introduction to the entire network infrastructure, from cabling to the routers. What you need to learn to pass a Cisco certification exam such as CCNA and what you need to know to survive in the real world are two very different things. The strategies that this book offers weren 't on the exam, but they 're exactly what you need to do your job well. Network Warrior takes you step by step through the world of hubs, switches, firewalls, and more, including ways to troubleshoot a congested network, and when to upgrade and why. Along the way, you 'll gain an historical perspective of various networking features, such as the way Ethernet evolved. Based on the author 's own experience as well as those he worked for and with, Network Warrior is a Cisco-centric book, focused primarily on the TCP/IP protocol and Ethernet networks -- the realm that Cisco Systems now dominates. The book covers: The type of networks now in use, from LANs, WANs and MANs to CANs The OSI Model and the layers involved in sending data Hubs, repeaters, switches, and trunks in practice Auto negotiation and why it 's a common problem in network slowdowns Route maps, routing protocols, and switching algorithms in Cisco routers The resilient Ethernet -- how to make things truly redundant Cisco 6500 multi-layer switches and the Catalyst 3750 switch Telecom nomenclature -- why it 's different from the data world T1 and DS3 Firewall theory, designing access lists, authentication in Cisco devices Server load balancing technology Content switch module in action Designing QOS and what QOS does not do IP design andsubnetting made easy The book also explains how to sell your ideas to management, how networks become a mess as a company grows, and why change control is your friend. Network Warrior will help network administrators and engineers win the complex battles they face every day.
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