DNS servers store records. When a DNS query is sent by a device, that query gets a response from those records with the help of DNS servers and resolvers. There are eight records that you see again and again: A, AAAA, CNAME, PTR, NS, MX, SOA, and TXT. We’ll focus here on those.
What are the records in DNS?
DNS records (aka zone files) are instructions that live in authoritative DNS servers and provide information about a domain including what IP address is associated with that domain and how to handle requests for that domain. These records consist of a series of text files written in what is known as DNS syntax.
How many DNS records can a domain have?
maximum:13. A domain name can point to multiple IP addresses. You can have unlimited number of IP address or A records for your domain name or sub-domains. The dns query in this case will be served in a round-robin fashion.
How many a records can you have?
Add a new record to a record set
You can add up to 20 records to any record set. A record set may not contain two identical records. Empty record sets (with zero records) can be created, but don’t appear on the Azure DNS name servers. Record sets of type CNAME can contain one record at most.
What are the five main DNS record types?
DNS Record types
- A (Host address)
- AAAA (IPv6 host address)
- ALIAS (Auto resolved alias)
- CNAME (Canonical name for an alias)
- MX (Mail eXchange)
- NS (Name Server)
- PTR (Pointer)
- SOA (Start Of Authority)
What is AAA record in DNS?
quad A Record
An AAAA Record (quad A Record) is another type of DNS Record that points a domain or subdomain to an IPv6 address, so that when someone types that domain or subdomain in the address bar, the browser knows where to go.
How many types of DNS are there?
The three DNS server types server are the following: DNS stub resolver server. DNS recursive resolver server. DNS authoritative server.
Can I have 2 A records?
Yes you can. It is called round-robin DNS, and the browser just chooses one of them randomly. It is a well used method of getting cheap load balancing, but if one host goes down, users will still try to access it.
What is MX record DNS?
An MX-record (Mail eXchange-record) is a type of resource record in the Domain Name System (DNS). This is the system that, among other indicates to what specific IP address emails need to be sent. The MX-record contains the host name of the computer(s) that handle the emails for a domain and a prioritization code.
What is MX and TXT records?
TXT record: This is used to store text-based information of the outside domain for the configured domain.MX record: This is used in mail delivery based on the configured domain. This is useful in redirecting email requests to the mail servers for a specified domain.
What is a record in Route 53?
Alias
Amazon Route 53 offers a special type of record called an ‘Alias’ record that lets you map your zone apex (example.com) DNS name to the DNS name for your ELB load balancer (such as my-loadbalancer-1234567890.us-west-2.elb.amazonaws.com).
What is a PTR record used for?
A PTR (or Pointer) record is a security tool. Essentially, when you receive an email, your mail server uses the PTR record that comes in with the email message to check that the mail server sending the email matches the IP address that it claims to be using. This is also known as reverse DNS lookup.
What is DNS in Azure?
Azure DNS is a hosting service for DNS domains that provides name resolution by using Microsoft Azure infrastructure. By hosting your domains in Azure, you can manage your DNS records by using the same credentials, APIs, tools, and billing as your other Azure services. You can’t use Azure DNS to buy a domain name.
Do you need an AAAA record?
1 Answer. To answer the question in your headline: No, it is not necessary to create an AAAA record for your website as long as most traffic runs over IPv4, but I would argue that it probably is beneficial for the deployment of IPv6 to have more sites support the protocol.
What is an AAAA server?
An AAAA record is used to find the IP address of a computer connected to the internet from a name. The AAAA record is conceptually similar to the A record, but it allows you to specify the IPv6 address of the server, rather than the IPv4.
What is DNS A record Cname?
A Canonical Name or CNAME record is a type of DNS record that maps an alias name to a true or canonical domain name. CNAME records are typically used to map a subdomain such as www or mail to the domain hosting that subdomain’s content.
Who runs the root DNS servers?
Where are the DNS root servers located? There are hundreds of root servers at over 130 locations all over the world. ICANN? is responsible for the servers for one of the 13 IP addresses and entrusts the operation of the rest to various other organizations.
What are the three domains of DNS?
DNS is a TCP/IP protocol used on different platforms. The domain name space is divided into three different sections: generic domains, country domains, and inverse domain.
Why do I have 3 DNS servers?
8 Answers. The major point in having a secondary DNS server is as backup in the event the primary DNS server handling your domain goes down.A secondary DNS server is always up, and ready to serve. It can help balance the load on the network as there are now more than one authoritative place to get your information.
Can DNS have multiple A records?
A Records are the simplest type of DNS records, and one of the primary records used in DNS servers. You can do a lot with A records, including using multiple A records for the same domain in order to provide redundancy and fallbacks.
Can two DNS point to same IP?
You can point as many DNS A records to an IP address as you want. In addition, nginx can be configured to listen on different ports, but it will also handle virtual hosts for HTTP so can listen for for different DNS hostnames on the same port.
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