First of all, to determine whether you really want to engage in this industry, by participating in training institutions or self-study CCNA can do this, because CCNA has a lot of knowledge, but it is very shallow, easier to grasp. If you think you are really interested in this, you can decide whether to study for CCNP or CCIE according to your own wishes. If you have the idea of taking CCIE, then don't take the NA NP exam, the CCIE exam does not require a CCNP certificate, but if you want to take the CCNP exam, then the certificate of CCNA is a must. If you want to study, you must interconnect theory and practice, the experiment is the best way to solve the blind spot of theoretical knowledge, and then more and more big problems can be solved under the guidance of the experiment, of course, the theory is also the basis of the experiment, the two are closely linked in the direction of the Cisco learning is embodied in the best.