Because both of them are professional-level examinations, especially if you take CCIE and HCIE, you can't learn by yourself, because both of them need theoretical and practical tests, and they need to be built and configured. And self-study may be to learn knowledge, but if you can't learn the test center, the training institution will conduct targeted training according to the content you want to take. The exam still needs to draw test sites or choose training institutions.

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