Computer Networks Chapter 4: Naming
10 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary purpose of a naming system in a distributed system?

  • To resolve names to the entity they refer to (correct)
  • To allocate IP addresses to entities
  • To provide a unique identifier for each entity
  • To manage user authentication

    • What is an entity in a distributed system?

  • A physical device such as a printer or a host
  • Anything that can be operated on, including resources and objects (correct)
  • A unique identifier for a user or a process
  • A resource that offers an interface containing operations

    • What is a name in a distributed system?

  • A unique identifier for an entity
  • A string of bits or characters that refers to an entity (correct)
  • An IP address assigned to a host
  • A username or a password

    • Why is the implementation of a naming system often distributed in a distributed system?

    <p>Because the system itself is distributed</p> Signup and view all the answers

    What are the main issues in designing a naming system in a distributed system?

    <p>Efficiency and scalability</p> Signup and view all the answers

    What is the primary purpose of separating the name of an entity and its address?

    <p>To make it easier and more flexible</p> Signup and view all the answers

    What is the characteristic of an identifier in a distributed system?

    <p>It refers to at most one entity and each entity is referred by at most one identifier</p> Signup and view all the answers

    What is a directory node in a naming graph?

    <p>A special entity that has a number of outgoing edges, each labeled with a name</p> Signup and view all the answers

    What is a path name in a naming graph?

    <p>A sequence of labels corresponding to the edges of the path and the first node in the path</p> Signup and view all the answers

    What is an absolute path name in a naming graph?

    <p>A path name that starts from the root of the naming graph</p> Signup and view all the answers

    Study Notes

    Naming in Distributed Systems

    • Names play an important role in distributed systems, enabling the sharing of resources, unique identification of entities, and reference to locations.
    • A naming system is necessary to resolve names to the entities they refer to, and its implementation is often distributed in nature.

    Entities and Naming

    • An entity in a distributed system is anything that can be operated on, such as resources (hosts, printers, disks, files, objects, processes, users, etc.).
    • A name in a distributed system is a string of bits or characters used to refer to an entity.
    • An access point is an entity that provides an interface to operate on another entity, and its name is called an address (e.g., IP address and port number).
    • An entity can have multiple access points, and its access point may change over time (e.g., a mobile computer getting a new IP address).
    • An address is a special kind of name that refers to at most one entity and is unique to that entity, even when replicated.

    Names, Identifiers, and Addresses

    • A name can be location-independent, making it easier and more flexible to manage.
    • An identifier is a unique name that refers to at most one entity, is unique to that entity, and always refers to the same entity (never reused).
    • Examples of names, identifiers, and addresses include:
      • Name of an FTP server (entity)
      • URL of the FTP server
      • Address of the FTP server (IP number: port number)

    Name Spaces and Name Resolution

    • Names in a distributed system are organized into a name space, which is generally a labeled, directed graph with two types of nodes: leaf nodes and directory nodes.
    • Leaf nodes represent named entities and store information such as their addresses or state.
    • Directory nodes are special entities with outgoing edges labeled with names, storing directory tables that represent outgoing edges as pairs (edge label, node identifier).
    • Each node in a naming graph is an entity with an identifier, and a directory node stores a table of outgoing edges.
    • A path in a naming graph can be referred to by the sequence of labels corresponding to the edges of the path and the first node in the path, called a path name.
    • Path names can be absolute (starting from the root node) or relative, and may have multiple paths leading to the same node.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    This quiz covers the basics of naming in computer networks, including the importance of naming, resolving names, and implementing a naming system in distributed systems.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser