Subconscious Study Avoidance (SSA) is well recognised problem during the early stages of commitment to the ‘Way of Study’. Typically, early stage candidates find that there are so many study options, that they start reconsidering their choice and think about studying Security or Voice, some even think about Wireless!
However. most people pass through this stage quickly and become Mendicants and really buckle down to serious, committed study plans. Stick with Routing and Switching, then you can build on those skills is my advice.