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How can I understand Networking which lead to be professional in Network security?

nabilhammoud asked
Last Modified: 2012-05-10

I do have a vast experienece in programing and some good experince in newtroking with more than 10 years in IT(software and hardware).

Now I am focusing to understand Networking from A to Z because I am intending to be professional in Network security and especially firewalls?

So please, could some body help me to have a good books name to start or videos if possible.

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