There are several aspects to take into account when choosing an image file for a router. You must know how much memory to run the code and how much flash to store the image are available in the router. Various versions would have different requirements for memory and for flash. You would also need to consider which feature set you need. There are basic feature sets (like IP only) which give you basic router functions and there are more advanced feature sets which give other functionality such as the ability to support encryption, or to to firewall style filtering. If you could tell us how much memory and flash are available and what set of features you need then we could help to identify versions for you.
Your question asked about the latest IOS. According to the Feature Navigator on the Cisco site the latest version for 3620 is 12.3(24a) and a version implementing IP feature set would be c3620-i-mz.123-24a.bin.
Or if you were really looking for the most recent in the 12.0 version it would be 12.0(28d). And the image with the IP only feature set would be c3620-i-mz.120-28d.bin.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...