Are there advantages and disadvantages of net neutrality versus allowing network operators to discriminate with regard to access and cost?

What is meant by “net neutrality,” and why is it controversial? Summarize and evaluate one argument for and one against net neutrality. What, if any, are the advantages and disadvantages of net neutrality versus allowing network operators to discriminate with regard to access and cost? Cite a resource to support your claims of advantages and/or disadvantages.