October 28, 2021
DNS

Most popular DNS commands

These DNS commands are well-known for their great functionality and are also frequently applied for DNS troubleshooting. The reason for that is they are simple and easy to use. You are able to check essential information about your DNS records and what is the condition of your network. Moreover, it doesn’t matter what Operating System (OS) you are using, Windows, macOS, or Linux. You already have several commands pre-build in your OS. Therefore, let’s clarify which are the most popular DNS commands and explain a little bit more about them.

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DNS

DNSSEC – why is it important?

DNS, by default it is not safe. Its purpose is to be able to provide a decentralized model for domain resolution and to do it fast because there are billions of people online always. Yes, the focus of the DNS is not safety. But there is a strong need for it, so here comes the DNSSEC. The DNSSEC is the security extension that gives us a good level of protection.

What is DNSSEC?

DNSSEC (Domain Name System Security Extensions) is an extension, on top of the DNS, that encrypts the DNS records that we use to communicate with the name servers. That way, even if somebody intercepts those DNS records, they will be encrypted and unreadable to them. So the cybercriminals will be with pointless random text in their hands.

DNSSEC provides security to the DNS in a simple and effective way.

Learn more about the DNSSEC service!

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Top 4 most popular DNS records

The Domain Name System (DNS) matches the domain names to their corresponding IP addresses. Thus, DNS records give the information for your hostname, domain, and IP address. With DNS records, you can adjust your domain configuration. There are many types of DNS records, but let’s start with the top 4 most popular of them.

A record and AAAA record

The A record is probably the most popular DNS record because it is used in almost any DNS system. It is an address record, so its purpose is to point a domain name to the corresponding IP address. Thanks to that, humans are not required to remember long and difficult numbers (IP addresses). Yet, the A record is usable when we are talking about IPv4 addresses.  

In case when we want to point a domain name to an IPv6 address, we have to use the AAAA record. It is not so commonly used in comparison to the A record. However, the amount of new devices is rapidly growing, so eventually,, the IPv6 and the AAAA record will also gain popularity.

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DNS

DNS resolution explained

How is it possible that we never learn a single IP address of a site, yet we can browse the Internet without any problems? What magical process transforms simple-to-write domain names into IP addresses and makes it so easy for us humans? It is called DNS resolution!

What is the DNS resolution?

DNS resolution is the process that DNS uses to resolve domain names to their IP addresses. It starts with a simple client’s DNS query for a domain name that later goes through a DNS recursive resolver, different DNS servers on different levels (Root, TLD, and authoritative servers) and brings back the IP address of the domain in the form of an A or AAAA record.

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DNS AAAA record explained

The DNS AAAA record is one of the essential Domain Name System records. It works with the IPv6 address. Let’s explain a little bit more about it.

What is the DNS AAAA record?

The DNS AAAA record is a DNS resource record. It has the main purpose of linking a domain name with the IP address, which it corresponds to. This is a process that happens every time a domain name is requested for the site to be accessible. The browser will be incapable of finding the IP addresses successfully for the requested domain names. For users will be impossible to reach your website without help from the AAAA record.

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What is a subnet mask?

What is a network? 

A network is 2, or more devices (computers, IoT, mobiles, etc.) connected to each other for the purpose of exchanging data electronically. 

What is a subnet mask? 

The subnet mask is a separator that defines which part of the IP address is dedicated to the hosts (connected devices) and which part is dedicated to the network address. The subnet mask gives us the size of the network that we are working with. 

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What is a Recursive DNS server?

If it’s about the domain name system (DNS), there is a lot to be said. It’s not simple stuff. A lot of processes and components are meshing to make the big system work efficiently.

When you dig behind everything needed for the Internet to run, every click gets a very different dimension. It’s not just a finger-clicking but whole machinery moving to get your website for the potential clients that request it.

Domain name system (DNS) is what makes possible that simplicity for users. But for the magic to happen, different elements are a must, like recursive DNS servers.

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DNS CAA record meaning

The DNS records are the instructions that clients and servers are searching for a particular domain. The common ones are the A records for a domain name to IP address resolution, the CNAME for redirecting subdomain to the domain name, MX for incoming mail servers, etc. But the DNS CAA record is not so well-known, so now we will explain it to you.

What is a DNS CAA record?

The DNS CAA record (Certification Authority Authorization) is a record that the DNS administrator of a domain can add to clarify which Certificate Authorities (CAs) can issue SSL or TLS certificates for the particular domain. The CA are external organizations that you, as a domain owner, can choose to issue cryptographic certificates like SSL or TLS for your domain name.

The cryptographic certificate is used to validate the domain owner and to encrypt the communication with that domain. That way, it protects sensitive data.

With the CAA, the domain owner will have improved control over the process of issuing certificates. He or she can clearly state who is permitted to issue certificates and lower the number of miss-issued certificated for that domain. The CAA record can be used for the whole domain, or chosen subdomains only, depending on how you set it up.

One common requirement for using CAA records is to first enable DNSSEC. That is required for better security and trust from the side of the CA.

How to add a CAA record?

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CDN (Content Delivery Network) explained

Perhaps if you hear CDN, you can get confused, or you totally ignore what it is about. But what if we mention Amazon, Netflix, Facebook, or Youtube?

Well, CDN is currently as popular as such international ventures. Just you don’t know it because it works in the backstage. Without it, not only those companies but many around the world just could not deliver their content to all their users.

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