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2cl&rpc - The International Standards Organization...

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The International Standards Organization Reference Model of Open System Interconnection (ISO OSI model) Application Presentation Session Transport Network Data Link Physical interfaces interfaces Host A Host B 1 2 3 4 5 6 7 Subnet Boundary Message Message Message Message Packet Frame Bit
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ISO OSI Model (The 7 Layers) Physical Layer specifies physical signals (electrical, optical), cabling/wiring. Data Link Layer frame boundaries, error detection (noise), flow control Network Layer how packets are sent from sources to destinations: routing, congestion control, inter- networking. Transport Layer break messages into packets, multiplex/demultiplex messages,end-to-end reliability. Session Layer provides users interface: directory, access rights, synchronization. Presentation Layer data encryption, data compression, code conversion. Application Layer virtual terminal, virtual file transfer
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Implementation of Layering Application layer Conversion layer Packet layer Frame layer Physical layer Frame Hdr Pkt Hdr Message Converted Message First Pkt Pkt Hdr Second Pkt Pkt Hdr First Pkt Frame Hdr Pkt Hdr Second Pkt Frames sent out onto network Information Transfer Presentation Session Transport
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Common Network Protocols Ethernet (IEEE 802.3) 10Mbps Carrier Sense Multiple Access / Collision Detect Token-Bus (IEEE 802.4) Physically a bus, logically a ring, token passing Token-Ring (IEEE 802.5) 4-16Mbps Ring topology, token passing Slotted Aloha Time slot, boardcasting Slotted-ring (Cambridge ring) Time multiplexing Fibre Distributed Data Interface (FDDI) High speed (100Mbps), token-bus like protocol Integrated Service Digital Network (ISDN) Multiples of 64kbps, up to 2 Mbps per channel for voice & video ATM Switch (155 Mbps, 622Mbps) Fast Ethernet (100Mbps), Giga-bit Ethernet (1Gbps)
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Popular protocols for PC 7 - Application 6 - Presentation 5 - Session 4 - Transport 3 - Network 2 - Data Link 1 - Physical Network Card UDP TCP SPX IP IPX NetBIOS DoD Netware/Novell IBM UDP:User Datagram Protocol TCP:Transmission Control Protocol IP:Internet Protocol SPX:Sequenced Packet eXchange IPX:Internetwork Packet eXchange
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The Client-Server Model A server is a program that provide a service.
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