CS402: Computer Communications and Networks

ALOHAnet originated at the University of Hawaii in the early 1970s. This network revolutionized wireless networking with its innovative ALOHA random access method using UHF frequencies to enable communications between remote units and a central station without dedicated scheduling. The system began as Pure ALOHA and was later refined with Slotted ALOHA, which had enhanced efficiency using synchronized transmission timings that mitigated data collisions. This formed the foundational technology for Ethernet, Wi-Fi, and mobile technology using a system of random time intervals.

How did Reservation ALOHA (R-ALOHA) reduce network delays and support higher traffic levels? What mechanism allows stations to maintain control over specific slots after successful transmissions? Consider how the two-channel star configuration of ALOHAnet optimized network communication for interactive computing. This design choice has influenced contemporary network communication protocols and the efficient use of network resources.