Ccna Security 210 260 Certification Guide Glen D Singh

What This Book Actually Covers

The CCNA Security 210-260 Certification Guide by Glen D Singh is a fairly thick reference book that covers the older Cisco security curriculum before they restructured it into the current SCSO exam. It walks through firewalls, VPNs, AAA, device hardening, and threat control features you will find on IOS devices and Cisco ASA appliances. The book itself was written for a certification track that Cisco retired, so the exam codes are obsolete now. The technology inside still exists in real networks, but you should know what you are buying into before you spend money on it.

Ccna Security 210 260 Certification Guide Glen D Singh

I ran across this book around 2022 when I was reviewing legacy documentation for a client who still had ASA 5500 series boxes running IOS-based firewall rules on top of PIX-era concepts. The company had a mixed environment with some older infrastructure that had never been migrated. The guide helped me navigate questions about how TACACS+ fallback actually behaves when the primary server goes down mid-session. That detail is not something you find in the current Cisco documentation because nobody maintains it for retired products anymore.

There is a specific scenario I ran into where the book actually saved me time. I was troubleshooting a client's site-to-site IPsec tunnel that kept dropping every few hours. The tunnel was using ISAKMP policy number 10 and the peer at the remote office was on older equipment. The guide's chapter on ISAKMP phase negotiation walks through exactly how phase 1 and phase 2 parameters have to match, including the often-overlooked point about pre-shared key length and character encoding. I verified the key was identical on both ends character-by-character and caught that one side had an extra space in the config. The tunnel came up after fixing that. The book did not directly tell me the answer but it gave me the framework to understand why matching parameters matters at each phase. The material covers NAT traversal, which remains relevant even though the exam is gone. Most people learning security nowadays skip NAT configuration entirely because they assume modern networks do not deal with it. That assumption is wrong. I have seen small-to-medium businesses running Cisco routers with static NAT rules for legacy servers that have no public IPv4 address anymore. Understanding how translation tables work and how to verify them with show commands is still a practical skill. One thing the book does well that newer materials sometimes miss is the breakdown of the Cisco Security Device Manager interface. SDM is an older GUI tool but the concepts behind it, role-based access, managed versus non-managed devices, and configuration deployment workflows, still apply when you work with ASA through ASDM or FTD through its web interface. The workflow patterns are the same even if the tool changed names.

AAA is another section where the book is thorough. It covers RADIUS versus TACACS+ differences, authentication versus authorization versus accounting separately, and how to configure each on a Cisco device. The counter-intuitive part most beginners miss is that TACACS+ does not encrypt the entire payload the way people assume. It encrypts only the password during authentication. The rest of the command data travels in cleartext unless you add additional encryption layers. This matters when you are sending privileged execution commands across an untrusted network. The VPN chapter gets into GRE over IPsec and tunnel mode versus transport mode. Here is a practical detail the book handles decently. When you use tunnel mode, the entire original IP packet gets encapsulated, which means you can route non-IP traffic through the tunnel if you need to. Transport mode only wraps the payload and leaves the original IP header visible. People picking between the two usually default to tunnel mode without understanding the MTU implications. The added headers reduce your effective MTU and if you do not adjust the path MTU on the endpoints you will see fragmentation issues that are hard to diagnose. I configured a tunnel once and spent two days chasing packet drops before realizing the issue was MTU, not the tunnel itself. The book mentions this in passing but the real lesson comes from watching it break in production. The firewalls section covers context-based access control and zone-based policy firewalls. Zone-based firewalls replaced CBAC on newer IOS versions and the migration caused problems on many networks because administrators did not understand that CBAC uses session state tracking while ZBF uses traffic class policies with explicit interzone actions. If you are working with a modern device you need to know which model you are dealing with. The guide focuses mostly on CBAC and early ZBF concepts, so cross-reference with current documentation when you apply it to actual equipment.

The downside of this book is that it covers a retired exam. The Cisco certifications were restructured in 2020 and the 210-260 exam no longer exists. If your goal is to pass a current security certification, this is not the right book. The current equivalent is the SCOM or SCSO exam tracks. The material in this guide will not map directly to those exams. You would be better off with the official CCNA Security study guide from Cisco Press or the SCSO prep materials if your aim is certification. Reading this book for exam preparation now is a waste of time and money. Another issue is the publication date. Much of the CLI syntax shown is from older IOS versions. Some commands have been deprecated or moved in newer releases. For instance, the access-list configuration syntax and the way you apply them to interfaces has evolved. If you practice the labs on current equipment you may run into places where the commands do not behave exactly as described. I found three or four instances where a command I tried on a live 2900 series router returned an error that the book did not mention. The concepts were correct but the implementation details had shifted. Always verify on the exact hardware and software version you are working with before assuming the syntax matches. The book also lacks coverage of some topics that are now standard in security. There is nothing on SSL inspection, which is a common requirement in enterprise networks. It does not cover Cisco Firepower Threat Defense at all, and it has minimal mention of next-generation firewall features like application awareness and URL filtering. If you are trying to build a comprehensive security skillset this book fills a narrow historical niche rather than a complete curriculum.

The download situation for this book is complicated. The PDF copies floating around the internet are almost certainly pirated. I would not encourage downloading them. The legitimate route is to buy the physical copy or check for an e-book from legitimate vendors. Used copies circulate on Amazon and eBay for reasonable prices since the book is out of print. If you find a used hardcover in decent condition it is usually cheaper than buying a new print-on-demand version from publisher outlets. I also want to mention something about studying from retired certification materials. There is value in understanding how Cisco structured the old security curriculum because many of the fundamentals did not change. The underlying protocols, the configuration patterns, and the troubleshooting methodology are still valid. What changed is the packaging and the naming. If you use this book as a conceptual foundation and then layer current certification material on top of it, the knowledge transfers well. I did exactly this when I prepared for the SCSO exam. The VPN and AAA chapters from the old guide gave me a stronger base than some of the newer prep books that skim those topics superficially. The lab recommendations in the book are dated but the exercise structure is still usable. You can run many of the configurations in Packet Tracer or GNS3 with IOS images that support the relevant features. The AAA labs work fine on GNS3 with IOL images. The IPsec labs require slightly more careful setup but are achievable. If you are setting up a home lab, budget for at least two routers and one switch minimum to practice the firewall and VPN sections properly.

One practical tip that comes from using this book in a real environment. When configuring IPsec on actual hardware, always write down your crypto map and ISAKMP policy numbers before you apply them. I once changed the ISAKMP policy on one side of a tunnel without updating the corresponding crypto map entry on the peer. The tunnel went down and the logs did not immediately indicate a policy mismatch. The error was buried under multiple phase negotiation failures. The book's troubleshooting flowcharts are useful here but they assume you have clean logs. Production environments rarely give clean logs. If you decide to use this guide, treat it as a reference for concepts rather than a step-by-step configuration manual for current equipment. The theory holds up. The CLI may not. Verify every command on your target platform before committing changes to a live system. The time you spend verifying will save you from pulling an all-nighter when a config silently fails during a maintenance window.