I use Cisco routers and switches throughout my hole network,. I been learning as I go and read the posts here so far I feel confident in operating certain hardware models .However, we I have a need to understand more is the ios, from what I read so far each model and depending on what you planning to configure you would need a certain ios, being that one would have the required flash and memory. My question is there are many ios out there for a particular model and most have for example 12.1(8a)E2 , whatever, which one should I choose, What does does number mean?. Can someone here explain me this, and if some one has some links that goes over basic stuff it would be great!!!!
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