Understanding DNS (Domain Name System)
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Understanding DNS (Domain Name System)

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Questions and Answers

What does the Domain Name System (DNS) do?

  • Ensures the security of websites
  • Prevents access to certain websites
  • Converts IP addresses into domain names
  • Translates domain names into IP addresses (correct)
  • What purpose does a DNS server serve?

  • Stores public IP addresses and their associated domain names (correct)
  • Acts as a firewall for internet traffic
  • Prevents access to malicious websites
  • Transmits data between devices connected to the internet
  • How does a DNS server enable users to access website data?

  • It translates domain names into IP addresses for proper routing (correct)
  • It directly sends the data to users' devices
  • It blocks unauthorized access to websites
  • It encrypts the website data for secure access
  • Why do people not need to remember IP addresses when accessing websites?

    <p>DNS servers translate domain names into IP addresses</p> Signup and view all the answers

    What is the role of a DNS server in accessing website data?

    <p>Finding the correct IP address corresponding to a URL</p> Signup and view all the answers

    What is the role of the DNS recursor in a usual DNS query?

    <p>Acts as a client itself</p> Signup and view all the answers

    What is the main function of top-level domain (TLD) nameservers?

    <p>Answer requests by sending back a list of authoritative nameservers</p> Signup and view all the answers

    What distinguishes a master server from a slave server in terms of authoritative nameservers?

    <p>Slave server shares the DNS server load</p> Signup and view all the answers

    What is the primary role of recursive DNS servers in the DNS architecture?

    <p>Provide answers to queries sent by authoritative DNS servers</p> Signup and view all the answers

    How do authoritative DNS servers differ from recursive DNS servers?

    <p>Authoritative servers store IP addresses of second-level domains</p> Signup and view all the answers

    Study Notes

    Domain Name System (DNS) Overview

    • Translates human-readable domain names into IP addresses, allowing users to access websites easily.
    • Operates as a hierarchical system managing network addresses and enabling resource identification.

    Purpose of DNS Servers

    • Acts as intermediaries that facilitate the retrieval of website data by translating domain names into corresponding IP addresses.
    • Enables devices to connect to web servers hosting specific resources.

    User Accessibility and IP Addresses

    • Users typically do not need to remember numeric IP addresses; they can use easily remembered domain names instead.
    • Makes internet navigation user-friendly and accessible by simplifying how users think of website locations.

    Role of DNS Servers

    • Essential in resolving web addresses by retrieving the correct IP addresses from a database of stored information.

    Role of DNS Recursor

    • Functions as the first point of contact during a DNS query, taking the request from a user and initiating the query process to find the relevant IP address.
    • Conducts the necessary queries against various DNS servers to retrieve the final IP address.

    Function of Top-Level Domain (TLD) Nameservers

    • Responsible for directing queries to the appropriate authoritative nameservers based on the domain extension (e.g., .com, .org).
    • Acts as the first layer in the DNS resolution process to facilitate finding the target domain's nameserver.

    Master Server vs. Slave Server

    • Master servers hold the primary DNS records and can make changes to them, whereas slave servers replicate data from master servers to ensure redundancy.
    • Slave servers provide backup and load distribution for nameserver queries.

    Primary Role of Recursive DNS Servers

    • Manages all aspects of DNS query resolution by searching for the correct IP address through the entire DNS hierarchy.
    • Reduces the need for user devices to contact multiple servers directly, streamlining the process.

    Authoritative DNS Servers vs. Recursive DNS Servers

    • Authoritative servers store the actual DNS records for domains and respond directly to queries about those specific records.
    • Recursive servers do not store records but query other servers to locate the correct data, functioning more as a facilitator of the resolution process.

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    Description

    Learn about the Domain Name System (DNS) and how it translates domain names into IP addresses for internet browsing. Discover the role of DNS servers in facilitating communication between devices on the internet.

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