How is LOOK different from SCAN? What is disk prefetching? What are its advantages and disadvantages? How is the organization of a polled network different from that of an internetwork? What protocol...

How is LOOK different from SCAN? What is disk prefetching? What are its advantages and disadvantages? How is the organization of a polled network different from that of an internetwork? What protocol device was the key to the robustness of DARPAnet? Who establishes standards for the Internet?