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What Is DNS? How Does It Work?

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The question “What is DNS?” can be answered like this: it is a system that acts as a bridge between a domain name and an IP address on the internet. The service, which works dynamically, answers every kind of query quickly and accurately. It also converts the domain name entered by users into numeric IP addresses and directs them to the right server.

Every device and service on the internet must have a unique IP address. But it is quite hard for users to remember numeric information like this. The Domain Name System (DNS), which comes into play at this point, performs domain name resolution. It also has additional functions such as directing internet traffic, load balancing and, in some cases, providing security services.

What Is DNS? What Is It Used For?

All devices and servers on the internet use IP addresses when communicating with each other. When a user visits any website, the browser takes the relevant domain name. Thanks to DNS, it learns which IP address this name corresponds to. This way the website's server is found correctly and the page loads.

DNS is responsible for converting the domain name the user has typed into the right IP address. This process takes place within a few milliseconds. The importance and advantages of the system, which spares visitors from dealing with complex addresses, are as follows:

  • The Domain Name System makes the internet more accessible and user-friendly.
  • DNS servers keep a cache for frequently queried domain names. This way, repeated queries are answered quickly.
  • DNS, which is used to direct traffic, provides load balancing between servers.
  • DNS also offers certain security services such as filtering and blocking. This prevents certain domain names from carrying malware or phishing attacks.
  • As a system distributed worldwide, DNS works with high reliability and continuity.

The Domain Name System, which has a hierarchical structure, makes quick access to information about millions of domain names on the internet possible. It also consists of different types of servers. In addition, it stores various kinds of information about domain names. For example, MX records contain information about email services.

How Does DNS Work?

The question “What does DNS mean?” can be answered like this: it is the system that lets every device in the virtual environment connect to each other through an IP address. The working principle of DNS, a kind of phone book, is as follows:

  • As soon as the user types a website address, the device processes the domain name as a DNS query. The browser turns to the DNS server to learn the IP address.
  • The browser first checks whether the DNS cache holds an IP address for the queried domain name. The DNS query for a domain name searched for in the past and still valid is completed. This way the visitor reaches the website in a very short time.
  • If there is no past result in the cache, the device sends a new query to the DNS server within seconds.
  • It happens that the responsible server does not know the IP address that exactly matches the given domain name. In such cases the DNS query is directed to the root servers. The root servers, at the top level of the system, pass the search on to the more specific name server.
  • The query finally reaches the authoritative DNS server associated with the domain name. In this process the requested IP address is determined and sent back to the server. The response then reaches the user's device and directs it to the right website.
  • In the last stage the browser connects to the web server with the IP address it received, and the content arrives on the user's screen.

DNS, which makes fast and trouble-free access to websites possible for visitors, is one of the cornerstones of the virtual world. It has an important function in different areas such as network security, speed and efficiency. Many people and organizations use DNS-based security solutions to prevent users from reaching malicious sites.

Does DNS Affect Internet Speed?

DNS, which performs domain name resolution, improves users' internet experience. The system also affects internet speed. The effect of DNS resolution time on speed can be explained as follows:

  • When accessing websites, the browser first sends a query to the DNS server. If the server works quickly and efficiently, the domain name is resolved as quickly as possible. However, when the host is slow or busy, the resolution time gets longer. As a result, access to the website is delayed.
  • Every internet service provider has its own DNS server. But the default host is not always the fastest option. In some cases users get a better experience thanks to different DNS servers. For example, Google or Cloudflare DNS is preferred by many people because it is fast and reliable.
  • Thanks to caching, a DNS server reaches previously resolved domain names as quickly as possible.
  • High traffic or DDoS attacks affect DNS servers negatively. A situation like this lowers the host's response speed and slows internet access.
  • Malware changes DNS settings and causes users to be directed to an inefficient server.
  • DNS Security Extensions (DNSSEC) are a measure that increases security by verifying DNS responses with a digital signature. However, this process makes the domain name resolution process longer. At this point the extra processing load affects internet speed somewhat.

Those who want a fast and reliable internet experience increase DNS speed through various methods. In this framework, using local and alternative servers is one of these solutions. Clearing the DNS cache regularly also increases internet speed. Reducing redirects through the Domain Name System creates a similar effect.

Is Changing DNS Safe?

Changing DNS settings is resorted to in order to make the internet connection faster and more reliable. However, if this process is not done knowingly, certain security risks arise. The headings below cover the negative situations a DNS change can create:

Risk of Connecting to Malicious DNS Servers

Connecting to an untrustworthy DNS server leads to personal data falling into the hands of ill-intentioned people. Redirecting to wrong IP addresses causes users to visit phishing sites or web pages that contain malware.

DNS Leaks

A DNS leak is a situation where internet traffic is directed to the normal connection instead of the virtual private network. A leak that occurs in the Domain Name System endangers users' online privacy. At this point it causes the real IP address and internet activities to be exposed.

Misconfiguration and Connection Problems

Misconfiguring DNS settings causes the internet connection to be cut completely or to slow down. In this respect, carrying out the process manually leads to the person losing internet access.

Weakening of Security Protocols

Servers that support security protocols such as DNSSEC increase the accuracy and security of queries. However, switching to third-party DNS servers causes such measures to be lost. As a result, attacks such as data manipulation and DNS spoofing become easy.

DNS Servers That Go Out of Service

If the DNS server in use goes out of service, the internet connection is cut. Free DNS providers running into heavy traffic and technical problems also give rise to access problems. For this reason, when using alternative hosts, their reliability and continuity must be taken into account.

Slowdowns and Instability

DNS servers get congested or work slowly during busy hours. This negatively affects internet speed. That is why users who change DNS should test the performance of the new server. The reason is that a low-performance service causes page load times to increase.

Content Filtering and Access Restrictions

Internet service providers or organizations filter content through DNS servers. A DNS change removes this filtering. A situation like this may be contrary to local laws or usage policies. In addition, various DNS servers use filters that block access to content such as pornography or malware. Removing such filters allows children to reach harmful web pages.

Changing DNS increases internet speed and improves security. However, this process also brings certain risks. Connecting to malicious DNS servers, security vulnerabilities and misconfigurations cause serious problems if they are not watched. For this reason, a secure DNS service should be chosen to fully ensure online privacy and security.