Understanding DNS Records: SRV Record
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Questions and Answers

Which of the following is NOT a primary benefit of DNS caching?

  • Increased load on upstream DNS servers (correct)
  • Faster lookup times
  • Improved reliability of DNS queries
  • Reduced bandwidth consumption
  • Where is DNS caching most commonly implemented to achieve the greatest performance improvements?

  • On the client's operating system
  • On the local network's DNS resolver
  • On the web browser
  • All of the above (correct)
  • What is the primary purpose of the Time-to-Live (TTL) value associated with a cached DNS record?

  • To control the maximum size of the DNS cache
  • To ensure the cached record is always up-to-date
  • To limit the duration for which the cached record can be used (correct)
  • To prioritize frequently accessed DNS records in the cache
  • Which of the following is a key advantage of browser-level DNS caching compared to operating system-level caching?

    <p>Browser caching is more granular, caching records at the individual domain level</p> Signup and view all the answers

    Which of the following is a characteristic of DNS caching at the operating system level?

    <p>It is the most persistent method of DNS caching</p> Signup and view all the answers

    Which of the following scenarios would benefit the most from effective DNS caching?

    <p>A web server serving dynamic content to a large number of clients</p> Signup and view all the answers

    What does the 'TTL' in DNS records stand for?

    <p>Time-to-Live</p> Signup and view all the answers

    Which type of DNS record forwards one domain or subdomain to another domain without providing an IP address?

    <p>CNAME record</p> Signup and view all the answers

    What type of DNS record stores the name server for a DNS entry?

    <p>NS record</p> Signup and view all the answers

    In DNS, what does the 'A' in an 'A' record stand for?

    <p>Address</p> Signup and view all the answers

    What is the default TTL (time to live) for 'A' records in seconds?

    <p>14400 seconds</p> Signup and view all the answers

    Which DNS record provides a domain name in reverse-lookups?

    <p>PTR record</p> Signup and view all the answers

    What is the main purpose of the minimum time-to-live (TTL) value for DNS resource records?

    <p>To specify the maximum time that a DNS resolver should cache the record before needing to query the authoritative server again</p> Signup and view all the answers

    Which of the following is NOT a benefit of browser-level DNS caching?

    <p>Increased security by preventing DNS spoofing attacks</p> Signup and view all the answers

    Where is DNS caching typically performed at the operating system level?

    <p>In the DNS resolver service provided by the operating system</p> Signup and view all the answers

    Which of the following is a key purpose of the $priority$ field in an SRV record?

    <p>To specify the relative priority of the target host for the service</p> Signup and view all the answers

    How do DNS servers typically handle requests for records with a low TTL value?

    <p>They check the cached record's TTL and only query the authoritative server if the TTL has expired</p> Signup and view all the answers

    What is the primary benefit of using SRV records for certain Internet protocols, compared to using other types of DNS records?

    <p>SRV records allow specifying a port number for the service, in addition to the server hostname or IP address</p> Signup and view all the answers

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