I have the following routers should I up them to the latest IOS? They work, but dont know if they have security issues. And do I have enough memory to upgrade the IOS? IOS (tm) C2600 Software (C2600-IS-M), Version 12.1(3a)T1, RELEASE SOFTWARE (fc1 ) ...

I have the following routers should I up them to the latest IOS? They work, but dont know if they have security issues. And do I have enough memory to upgrade the IOS? IOS (tm) C2600 Software (C2600-IS-M), Version 12.1(3a)T1, RELEASE SOFTWARE (fc1...

We have several Cisco 2600 routers. Our remote sites are also 2600 routers. Is there some way to visually monitor traffic between these remote sites that are point to point?

I have below listed my switches and current versions. I would like to update all my switches with the lastest versions. I know the 2950 latest version is 12.1(22)EA1b, but what about the 3500's? Will I loose configuration settings, etc when upgrading...