CCNA Voice Lab Workbook

Hello guys,

I am about to purchase CCNA Voice Lab Workbook ccna voice lab workbook.
What are PLUS and MINUS about this material?

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I guess the only minus is having to have a Lab environment in place to practice on, which you build at the CCNP level. Very much chicken & egg.

I already have 2 x 2811, 2 x 3750, 2 x 2950 and 6 x 7960G phones. Is it OK for CCNP Voice?

And what do you think about that lab workbook?