Problem
a) Discuss the specifics of different methods data transmission: error check, link-control, and channel access by multiple users, both in regular and wireless environments. Describe the essentials of link aggregation focusing on the two major benefits if it: increasing the throughput and providing redundancy.
b) Distinguish between communication at the network layer and communication at the data-link layer. Why are routers and switches used? Why we need layer 2 and layer 3 switches?