Can anyone recommend a good 640-891 book?

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Hi,


I"d like to work on my ccnp certification and I'm thinking of taking
the 640-891 composite exam...any good books out there on this one?
amazon.com doesnt seem to have any books on 640-891 exam

Also, is it a good option to take 640-891 composite in order to attain
ccnp much like the 640-801 exam for ccna?


thanks for any info


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