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What is DNS and Why it’s important ?
Types of DNS Records
DNS Hierachy Explained : Root to Authoritative Servers
The Domain Name System (DNS) is like the internet’s phone book. It helps you find websites by translating easy to remember names like (google.com) into the numerical IP addresses (like 192.0.2.1) that computers use to locate each other to the internet. Without DNS, you would have to remember long strings of numbers to visit your favourite websites.
What is the Need of DNS ?
Every Host is identified by the IP address but remembering numbers is very difficult for people also the IP addresses are not static therefore a mapping is required to change the domain name to the IP address. SO DNS is used to convert the domain name of website to their numerical IP adresses.
Types of DNS Records :
A records : Address Records, or A records , are the most common DNS Records used. They create a direct connection between an IPv4 address and a domain name . IPV4 address have the following format : 93.184.216.34
AAAA records : Like A records , this type of record connects domain names to IPV6 addresses. IPV6 addresses have numerals than IPV4 addresses are running out.
CNAME records : Canonical name records , or CNAME records, direct an alias domain to a canonical domain. This means that this type fo record is used to link subdomains to domain A or AAAA records .
DNAME records : Delegation name records, or DNAME records, are used to redirect multiple subdomains with one record and point them to another domain.
CAA records : Certification authority authorization records, or CAA records, allow domain owners to specify which certificate authorities (CAs) can issue certificates for their domain.
DNS Hierarchy :
There are five levels of DNS hirearchy.
1) Root Level : The DNS hierarchy orginates at the Root level , housing the DNS root zone managed by authoritative root name servers . These servers are pivotal in redirecting requests to the appropriate Top-Level Domain (top level domains ) name server . There are 13 root zone .
2) Top Level Domain : Situated just below the Root Level, Top-Level Domains (top level domains) constitute the subsequent tier in the DNS hierarchy. Examples include widely recognized extensions such as .com, .net, and .org, each reflecting organizational hierarchy or geographic distinctions.
3) Second Level Domain : Directly beneath top level domains, Second Level Domains (second level domains) form the subsequent layer in the DNS hierarchy. These domains are specific to organizations or entities and serve as primary identifiers within web addresses.
