1. IT 242 Week 1 CheckPoint OSI Model To purchase this material link http://www.assignmentcloud.com/IT-242/IT-242-Week-1- CheckPoint-OSI-Model For more courses visit our website http://www.assignmentcloud.com/ IT 242 Week 1 CheckPoint OSI Model Describe the open systems interconnection (OSI) model and how it relates to a network in 200 to 300 words. Include answers to the following: · On which layers of the OSI model do WAN protocols operate? · What are some of these protocols? · On which OSI layers do switches and routers operate? If routers reside at more than one layer, what is the difference between OSI layers?