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Most hubs amplify the electrical signal; therefore, they are really repeaters with several ports. Hubs and repeaters are Layer 1 (physical layer) devices. Benefits of the OSI Reference Model A layered network model, such as the OSI reference model, has several advantages: ✦ Independently operating layers with clearly defined interlayer interfaces allow layers to evolve internally without impact on other layers. As long as a layer continues to interact the same way with upper and lower layers, it can change internally to adapt to new technologies and needs.
Introduction to the OSI Reference Model The International Organization for Standardization (ISO) defined the Open Systems Interconnection (OSI) reference model to standardize networking of devices from different vendors. The OSI reference model is mostly an architecture blueprint that networking and computer device manufacturers implement. The OSI model has never been implemented exactly as defined. The TCP/IP protocol stack is the closest implementation available today. Seven Layers The OSI reference model is designed in seven functional layers.
At this point, the bidirectional TCP connection is established. TCP connections are bidirectional, because both hosts send SYN and ACK messages to each other to synchronize and guarantee a reliable data transfer. Sequencing and acknowledgments TCP connections are bidirectional: They allow both hosts to send and receive TCP segments. TCP controls the flow of segments in each direction of a connection independently using sender and receiver sequence numbers. Thus, TCP connections maintain two sets of sequence numbers: sender sequence numbers and receiver sequence numbers.