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They also provided further reading links which I found to be very useful. cisco certified network associate 200 301 ccna In certain cases, concepts are taught in much better way than books completely dedicated on specific protocol/technology.  I'll specially like to mention the way authors explained EIGRP DUAL algorithm. It is a tough concept to grasp but they explained it in real simple way and I know I'll never forgot RD, FD, FC and FS :-) cisco certified network associate 200 301 ccna