What is DNS RFC?
The Domain Name System (DNS) is a hierarchical decentralized naming system for computers, services, or any resource connected to the Internet or a private network. It associates various information with domain names assigned to each of the participating entities.
What is TTL in Cname?
Time To Live (TTL) The TTL is a value in a DNS record that determines the number of seconds before subsequent changes to the record go into effect. Each of your domain’s DNS records, such as an MX record, CNAME record, and so on, has a TTL value.
What are the types of DNS queries?
3 types of DNS queries—recursive, iterative, and non-recursive.
What RFC 1035?
Abstract. This RFC is the revised specification of the protocol and format used in the implementation of the Domain Name System. It obsoletes RFC-883. This memo documents the details of the domain name client – server communication.
What is TTL 3600?
With a TTL of 3600 seconds, or 1 hour, that means that as a recursive server learns about example.com, it will store that information about the A-record at example.com for one hour.
What are two types of DNS?
There are three main kinds of DNS Servers — primary servers, secondary servers, and caching servers.
- Primary Server. The primary server is the authoritative server for the zone.
- Secondary Servers. Secondary servers are backup DNS Servers.
- Caching Servers.
What type of query is nslookup?
In simple terms, Nslookup queries a local or the remote DNS servers to dig out information about the requested domain.
Can hostnames have spaces?
They can contain the letters a-z, numbers 0-9 and special character – (dash). Basic Hostname Guidelines: You cannot have more than one dash within a hostname. A hostname cannot have any spaces, nor can it start with a dash.