AppleTalk sử dụng một hệ thống đặc biệt năng động giải quyết để xác định địa chỉ của các nút trên mạng. Khi một máy tính Macintosh được cung cấp trên mạng, máy tính tạo ra một địa chỉ ngẫu nhiên và chương trình phát sóng nó lên mạng. | PART I Understanding Network Architectures CHAPTER 1 AppleTalk uses a special dynamic addressing system to determine the address of the nodes on the network. When a Macintosh is powered up on the network the computer generates a random address and broadcasts it out onto the network. This random address becomes its network address if another Macintosh isn t already using that address if so the newly powered on Mac will continue to generate random addresses until it finds one that is unused . AppleTalk is similar to Ethernet in that it is a passive network architecture. AppleTalk uses Carrier Sense multiple access with collision detection CSMA CA. Basically the computers sit on the network and listen to determine whether the wire is clear. After making sure the network is clear the computer will send a packet onto the network letting all the other computers know that it intends to transmit data. The computer then sends out its data. The fact that a computer that intends to send data out onto the network notifies the other network nodes as to its intentions greatly reduces the number of collisions on a CSMA CA network especially when compared to Ethernet . These announcement packets however do have a tendency to slow down the network and Macintosh networks only have a transmission speed of Kbps. The fact that the hardware and software needed to network a group of Macintosh computers comes with each Macintosh other than the LocalTalk cable makes it an easy and inexpensive way to network several workstations to share a printer or files. 31 The OSI Model and Network Protocols OSI The Theoretical Networking Protocol Stack The OSI Layers The Data Link Sublayers Real-World Network .
