Understanding DNS Records: SRV Record

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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?

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

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

It is the most persistent method of DNS caching Signup and view all the answers

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

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

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

Time-to-Live Signup and view all the answers

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

CNAME record Signup and view all the answers

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

NS record Signup and view all the answers

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

Address Signup and view all the answers

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

14400 seconds Signup and view all the answers

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

PTR record Signup and view all the answers

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

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

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

Increased security by preventing DNS spoofing attacks Signup and view all the answers

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

In the DNS resolver service provided by the operating system Signup and view all the answers

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

To specify the relative priority of the target host for the service Signup and view all the answers

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

They check the cached record's TTL and only query the authoritative server if the TTL has expired 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?

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