Explanation and definition of DNS cache
A DNS cache is a temporary cache memory used by DNS resolvers and other devices to store data. The DNS records that were initially applied to the domain names that were searched are kept in memory. These records contain information such as domain names’ IP addresses (IPv4 or IPv6), details about their email servers, services, authentication, verification information, and more. The DNS cache will save all of the data. However, as previously said, it will only last briefly because each DNS record has a TTL (Time to Live) value.
It is significant to notice that the DNS cache will momentarily contain all of the records for the different domain names. This is because the administrator sets the TTL (Time to Live) value, which determines how long it will last.
Users’ DNS queries can get faster responses thanks to this method, which also aids in effective resource optimization.
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TTL is really obligatory if you are using the Domain Name System. It is like an expiration date for DNS records. How it works, and can you check it, we will see later. Let’s start.
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Nslookup command explained
The Nslookup command is a helpful and very useful tool with a command-line interface (CLI). The abbreviation “nslookup” is short for “name server look up”. Typically, it is utilized for finding the IP address of a particular host or performing a Reverse DNS Lookup which is a process of finding a domain name that is associated with an IP address (IPv4 or IPv6). In most cases, it is pre-built on almost every operating system (OS). That is why it is a very popular choice for administrators.
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From what we know, there are a lot of DNS record types. They are a critical component of the Domain Name System process. In this article, we will define them and discuss which types of records are most important.
DNS record – what is it?
DNS records are text instructions kept in zone files that allow domain names to be resolved to IP addresses (A record and AAAA record). They are very light and simple to edit (if necessary) and depend on the type of query. In view of the fact that computers are not human, they use records to understand and read texts. That is, they convert the written file into numbers that machines can interpret.
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