Yes, Cisco skipped versions 13 and 14 because off perceived bad luck in different cultures. 12.4T, the latest version T-train in version 12, stands alone for various reasons, at least in how it’s used for thinking about home labs. 12.4 (mainline) and 12.3T support the same features. 12.3 (mainline) and 12.2T support the same features. 
A T-train version has the same features – those topics you want to study – as the next mainline release. The only two trains we will discuss are the mainline train (which has no suffix letters after the version), and the T-train (with suffix letter T, e.g., “12.4T”). Each train can focus on other needs Cisco has for releasing software, for instance, some trains may strive to keep the code stable, while others add every new feature and therefore risk more bugs. Cisco creates multiple sets of IOS releases for each version, with each set called an IOS release train. Over time, Cisco creates new IOS releases inside each major version, making the IOS image files for each release available to their customers. 
Cisco numbers IOS software “versions”, the major new releases of Cisco IOS software for routers, with two numbers, like 12.4, or “version 12.4”.But to keep this blog post to a reasonable length, let me summarize a few facts, while admittedly leaving out some background: I could write a whole book about how to build a home lab, and this one little section would probably get a whole chapter in the book.
Want eBooks? Want extra practice questions? Get the Premium Edition: CCNA 200-301 Official Cert Guide, Volume 1 Premium Edition eBook and Practice TestĪ Brief Overview of IOS Version Numbers that Matter
200-301 V2 Ch16: Controller-Based Networks. 200-301 V2 Part 4: Network Architectures. 200-301 V2 Ch12: Miscellaneous IP Services. 200-301 V2 Ch05: Securing Network Devices. 
200-301 V2 Ch04: Security Architectures.200-301 V1 Ch25: Configure IPv6 Routing.200-301 V1 Ch24: Configure IPv6 Addressing.200-301 V1 Ch18: Troubleshooting Routing.200-301 V1 Ch16: Router Addresses and Routes.200-301 V1 Ch14: Analyzing IPv4 Subnets.200-301 V1 Ch12: Classful IPv4 Networks.
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