This is for good reason.   300-420 ensld training It provides an explanation of a majority of the pertinent switching technologies and also serves as an ample design and implementation guide.  My only real critique is that some switching technologies from the CCIE blueprint are conspicuously missing.  Hopefully, this will be corrected in an updated edition.  Still, I recommend this book, not only for CCIE candidates, but also as an essential book for anyone serious about a career in networking.  On my 5 ping rating scale, I give it a 5.!!!!! 300-420 ensld training

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