Distributed Systems Principles and Paradigms Chapter 02 Communication 00 – 1.

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Presentation transcript:

Distributed Systems Principles and Paradigms Chapter 02 Communication 00 – 1

Layered Protocols –Low-level layers –Transport layer –Application layer –Middleware layer Remote procedure call (RPC) Sun RPC DCE & DCE RPC Remote Method Invocation Message-Oriented Communication Stream-Oriented Communication 02 – 1 Communication/2.1 Layered Protocols

Basic Networking Model Open Systems Interconnection Reference Model (Zimmerman, 1983) Also called ISO OSI or OSI Model ISO – International Standards Organization 02 – 2 Communication/2.1 Layered Protocols

Low-level layers Physical layer: contains the specification and implementation of bits, and their transmission between sender and receiver Data link layer: prescribes the transmission of a series of bits into a frame to allow for error and flow control Network layer: describes how packets in a network of computers are to be routed. Observation: for many distributed systems, the lowest level interface is that of the network layer. 02 – 3 Communication/2.1 Layered Protocols

Transport Layer Important: The transport layer provides the actual communication facilities for most distributed systems. Standard Internet protocols: TCP: connection-oriented, reliable, stream-oriented communication UDP: unreliable (best-effort) datagram communication Note: IP multicasting is generally considered a standard available service. 02 – 4 Communication/2.1 Layered Protocols

Client–Server TCP 02 – 5 Communication/2.1 Layered Protocols TCP for transactions (T/TCP): A transport protocol aimed to support client–server interaction Normal operation of TCP Transactional TCP

Application Layer Observation: Many application protocols are directly implemented on top of transport protocols, doing a lot of application- independent work. 02 – 6 Communication/2.1 Layered Protocols

Middleware Layer A rich set of communication protocols, but which allow different applications to communicate Marshaling and unmarshaling of data, necessary for integrated systems Naming protocols, so that different applications can easily share resources Security protocols, to allow different applications to communicate in a secure way Scaling mechanisms, such as support for replication and caching 02 – 7 Communication/2.1 Layered Protocols Observation: Middleware is invented to provide common services and protocols that can be used by many different applications: