Hello Martin I was just surfing on the net and stumbled on to your letter. To answer your first question. Your diploma is valid for 3 years. Why 3 years? Because in three years a lot can change and a lot of new things will come out also. For your second question....i can't give you a complete answer all I know is that 3.1 version is an update.
I hope this was helpfull.. if you have anymore question feel free to ask.
First - passing the Final Exam of the 4th Cisco Networking Academy course does *NOT* make you CCNA certified.
These courses prepare you for the certification exam - see:
you have to take a testing centre external to your Academy.
The version of the course you are currently finishing has prepared you for exam CCNA 640-801. The last day for the general public to take this exam is 06 November 2007. However, as a Networking Academy student you can be eligible to take the exam until November 2008. If you have set your student profile on Academy Connection to receive Academy emails you have received some information about this. Also when you log into Academy Connection always check the "Headlines" at the top of the page. And talk about this with your instructor, they have been receiving information about this for 6 months.
Then once you have passed the CCNA certification exam it is valid for 3 years from the date you passed the exam. Before it expires you either take whatever CCNA certification exam is current at that time, or a CCNP exam, to re-certify.
The above website has links to allt his information. In fact if you expect to use your CCNA in the workplace, you need to be able to navigate around
- it contains a universe of general and technical information you will use every day in a networking job.