Depends what you did on a daily basis. Do you have a lot of experience at the CLI prompt? If so, you're in good shape for the sims, which are worth the most. Though, with the CCENT, I think you may not have sims, come to think of it. A month seems doable if that were the case. But consistent book study. If you decide to go for your
CCNA instead, probably more like two months. If you don't have much experience with CLI on switches and/or routers, I'd say 3-4 months of real consistent study. Maybe longer.
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