Crampons and Spikes are not necessary required. If you have good high ankle waterproof shoes which has good traction, you really do not need a crampon. However, walking over snow without crampons for a beginner becomes a tough task and you can slip frequently. Sometime, slipping can hurt you or twist your ankle. So, a walking crampon is advisable. Most of trekking companies provide gaiters, crampons or spikes if there is heavy snow during the trek.