IT 242 Week 1 CheckPoint OSI Model

 Describe the OSI model and how it relates to a network in 200 to 300 words. Your response must include answers to the following:

 o On which layers of the OSI model do WAN protocols operate?
 o What are some of these protocols?
 o On which OSI layers do switches and routers operate?
 o If routers reside at more than one layer, what is the difference between the OSI layers?