Overview of Communication Types in Networking
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What is the primary function of a message broker in a distributed system?

  • To facilitate routing and transformation of messages between clients (correct)
  • To store messages permanently for retrieval by clients
  • To manage the application-specific messages directly from clients
  • To authenticate and restrict access to message queues

    • In IBM's WebSphere MQ, what is the role of a queue manager?

  • To establish secure communication channels between clients
  • To store messages indefinitely for storage management
  • To oversee the placement and retrieval of messages from queues (correct)
  • To manage the transformation of messages

    • What component is essential for message transfer between queues at different processes in IBM's WebSphere MQ?

  • Remote Procedure Call (RPC) mechanism
  • Application-specific message format
  • Message channel agent (correct)
  • Message queue broker program

    • What are message channel agents responsible for in the context of IBM’s WebSphere MQ?

    <p>Unwrapping messages from transport-level packets</p> Signup and view all the answers

    What mechanism allows processes to put messages into remote queues in WebSphere MQ?

    <p>Remote Procedure Call (RPC)</p> Signup and view all the answers

    What is the nature of communication in Message-Oriented Communication as described?

    <p>Asynchronous and unidirectional</p> Signup and view all the answers

    What is a key function of the Message Channel Agents (MCAs) in the system?

    <p>They automatically start when messages arrive.</p> Signup and view all the answers

    Which type of network management is involved in setting up routes within the queue managers?

    <p>System administration</p> Signup and view all the answers

    How can a network of queue managers be characterized based on the content provided?

    <p>Any network can be created without restrictions.</p> Signup and view all the answers

    In terms of client-server communication, what type of communication does not occur?

    <p>Bidirectional message exchange</p> Signup and view all the answers

    What is the purpose of using logical names in message-oriented communication?

    <p>To put messages in remote queues.</p> Signup and view all the answers

    Which type of communication is characterized by time-dependent values?

    <p>Stream-oriented communication</p> Signup and view all the answers

    What type of media is NOT considered continuous?

    <p>Text messages</p> Signup and view all the answers

    Which of the following is typically included under continuous media?

    <p>Television broadcasts</p> Signup and view all the answers

    What does stream management in distributed systems primarily involve?

    <p>Handling continuous data transmission</p> Signup and view all the answers

    How does message-oriented communication differ from stream-oriented communication?

    <p>Stream-oriented is for continuous data, while message-oriented is for discrete exchanges.</p> Signup and view all the answers

    Which component is essential in routing messages in IBM's WebSphere MQ?

    <p>Routing table</p> Signup and view all the answers

    In the context of stream-oriented communication, which data type is generally not included?

    <p>State change notifications</p> Signup and view all the answers

    What is a key characteristic of message-oriented middleware?

    <p>It allows processes to send messages that are queued.</p> Signup and view all the answers

    Which statement best describes Remote Procedure Call (RPC)?

    <p>RPC allows the caller to operate as if the procedure is local.</p> Signup and view all the answers

    In the context of RPC, what does the term 'black box' refer to?

    <p>Well-engineered procedures that operate in isolation.</p> Signup and view all the answers

    What does the client do in a basic RPC operation after calling a remote procedure?

    <p>Continue executing other tasks while waiting for results.</p> Signup and view all the answers

    What aspect of RPC enhances fault tolerance?

    <p>Use of message queues for communication.</p> Signup and view all the answers

    Which of the following is NOT a typical feature of Remote Procedure Calls?

    <p>Immediate execution without queuing.</p> Signup and view all the answers

    What characterizes TCP communication?

    <p>Reliable and connection-oriented</p> Signup and view all the answers

    Which of the following describes persistent communication?

    <p>Messages are queued until delivered successfully</p> Signup and view all the answers

    What does the communication mechanism in an RPC primarily facilitate?

    <p>Hidden communication between caller and callee.</p> Signup and view all the answers

    What happens when a client makes a call to a remote procedure in RPC?

    <p>The request is sent to the server for processing.</p> Signup and view all the answers

    In the context of middleware, what is a primary purpose of naming protocols?

    <p>To allow easy sharing of resources</p> Signup and view all the answers

    What is the distinction between transient and persistent communication?

    <p>Transient requires immediate delivery, persistent does not</p> Signup and view all the answers

    Which of the following is a feature of UDP?

    <p>It utilizes best-effort delivery methods</p> Signup and view all the answers

    In middleware, what is a key function of (un)marshaling?

    <p>To convert data formats for integration</p> Signup and view all the answers

    What type of communication occurs when synchronization happens at request delivery?

    <p>Synchronous communication</p> Signup and view all the answers

    Which of the following best describes a situation where a message is discarded if not delivered immediately?

    <p>Transient communication</p> Signup and view all the answers

    What is the primary function of using buffers in stream-oriented communication?

    <p>To reduce jitter in packet delivery</p> Signup and view all the answers

    What effect does packet loss have when multiple samples are sent in a single packet?

    <p>It creates gaps in playback when the packets are delivered</p> Signup and view all the answers

    How should the difference in time between synch substreams be maintained in a stereo sound stream?

    <p>Less than 20–30 µsec</p> Signup and view all the answers

    What does a buffer help alleviate in terms of packet delivery?

    <p>Variability in playback timing</p> Signup and view all the answers

    Which scenario exemplifies the challenge of stream synchronization?

    <p>Playing two audio channels simultaneously in stereo</p> Signup and view all the answers

    In the context of lost packets, what is one possible consequence of missing packets 1 and 2 in a sequence?

    <p>Gaps will appear in the playback timeline</p> Signup and view all the answers

    What strategy can be employed to minimize the impact of lost frames in a stream?

    <p>Redundant data transmission</p> Signup and view all the answers

    Which of the following statements about enforcing Quality of Service (QoS) is true?

    <p>QoS measures can help manage packet loss and improve overall performance.</p> Signup and view all the answers

    Study Notes

    Overview of Communication Types

    • Layered protocols, remote procedure calls (RPCs), message-oriented communication, stream-oriented communication, and multicast communication are discussed.

    Layered Protocols

    • A layered protocol model is used in networking.
    • Low-level layers deal with physical transmission. (bits)
    • The transport layer manages actual communication.
    • Application and middleware layers provide high-level services.
    • The model has drawbacks, including focus on message-passing only, and potential for unnecessary functionality and violations of access transparency.
    • The basic networking model includes application, presentation, session, transport, network, data link, and physical layers.

    Low-Level Layers

    • Physical layer: details regarding bits and transmission between sender and receiver.
    • Data link layer: rules for transmitting bits into frames (error and flow control).
    • Network layer: describes packet routing in computer networks.
    • For distributed systems, the lowest-level interface is typically the network layer.

    Transport Layer

    • The transport layer is crucial for most distributed systems, providing communication facilities.
    • TCP (connection-oriented, reliable, stream-oriented communication)
    • UDP (unreliable, best-effort datagram communication)
    • IP multicasting is often considered a standard service, but can be unreliable.

    Middleware Layer

    • Middleware provides common services and protocols used by various applications.
    • Protocols for communication, data marshaling and unmarshaling, naming, security, and scaling mechanisms (replication, caching), are essential for seamless application integration.

    Types of Communication

    • Communication can be categorized as transient or persistent.
    • Transient communication is discarded if unable to reach its destination.
    • Persistent communication ensures message delivery by storing it for retrieval.
    • Synchronization points for communication occur at request submission, request delivery, and after processing by the server.

    Client/Server

    • Client/server computing relies on a model of transient synchronous communication.
    • Clients initiate requests and block until receiving a response.
    • Servers wait only for incoming requests and then process them. -Drawbacks include: Clients cannot perform other tasks while waiting, and failures must be immediately handled. This approach may not work for all types of communication (like email).

    Message-Oriented Communication

    • Message-oriented middleware facilitates asynchronous and persistent communication.
    • Messages are queued and processed by sender/receiver without immediate reply.
    • Middleware often improves fault tolerance and ensures messages aren't lost.
    • Concepts and methods of transient messaging, message-queuing systems, and message brokers to improve heterogeneous communication between applications in a single heterogeneous system.
    • Example: IBM's WebSphere, a popular messaging system.

    Transient Messaging using Sockets

    • A set of communication steps for transient messaging using sockets. The steps are as follows.
    • Create, bind, listen, connect, send, receive, close.
    • Methods to establish communication endpoints and send/receive data over networks (often based on standard protocol like TCP/IP).

    Message-Oriented Middleware (queues)

    • Queues act like buffers.
    • PUT adds a message to a queue.
    • GET retrieves a message from a queue and blocks until it's not empty.
    • POLL retrieves the first message from a specified queue.
    • NOTIFY: a handler is called when a message is added to the queue.

    Message Broker

    • Message brokers act as intermediaries managing application heterogeneity in Message Queuing systems.
    • They change the input format of messages.
    • They can be used as application gateways.
    • They support subject-based routing for more complex applications.

    IBM's WebSphere MQ

    • WebSphere MQ is a message queue system that uses queues for application-specific messages.
    • Queues are managed by a queue manager.
    • Message transfer requires channels.
    • Agents handle communication at each channel endpoint using lower-level networking tools like TCP/IP.

    Routing

    • IBM WebSphere MQ uses routing tables for logical access and name resolution to local queues.
    • These tables facilitate communication with remote queues when a client sends data to a remote location in the network.

    Stream-Oriented Communication

    • Suitable for continuous media like audio, video, and sensor data.
    • Stream-oriented communication involves timely delivery of values.
    • It supports various timing modes: asynchronous, synchronous, and isochronous.
    • Streams are unidirectional, have a single source, and one or more receivers.

    Streams and QoS

    • Stream quality of service (QoS) involves factors such as bit rate, maximum delay before transmission, maximum end-to-end delay, delay variance (jitter), and maximum round-trip delay.

    Enforcing QoS

    • Different network-level tools are available to prioritize and control packet delivery of streams.
    • Buffers can help reduce jitter effects
    • Packet loss management is a challenge when samples are merged into packets, to avoid corrupted data segments when communicating between systems.

    Stream Synchronization

    • Stream synchronization is crucial in systems handling multiple streams (e.g., audio/video).
    • Multiplexing into a single stream and demultiplexing at the receiver is a solution.

    Multicast Communication

    • Application-level multicasting organizes nodes into an overlay network for data dissemination.
    • Chord, using tree building, determines the responsible node for multicast data.

    Epidemic Algorithms

    • Epidemic algorithms for multicast are designed for eventual consistency of data between system nodes.
    • Update operations are handled by different modes based on the method (anti and gossip).

    Anti-entropy

    • Randomly selected nodes exchange updates to reach a consistent state.

    Gossiping

    • The node that is updated propagates information to other nodes by repeating in cycles. The probability of repetition is based on factors like network conditions, message propagation time.

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    Distributed System Programming Lecture 04 PDF

    Description

    This quiz explores various types of communication in networking, including layered protocols and different communication methods like RPCs and multicast. Understand the foundational layers, their functions, and the implications of using a layered model. Test your knowledge on both low-level and high-level networking concepts.

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