How many levels are there in domain name space?

There is a DNS zone for each Top Level Domain, such as “.com”, “. org” or country codes like “. co.uk”. there are currently over 1500 top level domains.

Why does DNS impose a limit on the key length?

1 Answer. label length The 63-byte limit is because in the DNS protocol, labels stored as , length is a single byte, but two high bits of the length field reserved for something else (compression) thus leaving 6 bits for the length itself, 2^6=64 possible values – 0..

How the domain name space is divided?

The domain name space is divided into three different sections: generic domains, country domains, and inverse domain.

How many parts must a domain name have?

Domain names are the unique, human-readable Internet addresses of websites. They are made up of three parts: a top-level domain (sometimes called an extension or domain suffix), a domain name (or IP address), and an optional subdomain.

What is the longest possible domain name?

The longest legal domain name is 63 characters starting with a letter or number.

Does domain have 3 categories?

The three domains are the Archaea, the Bacteria, and the Eukarya. Prokaryotic organisms belong either to the domain Archaea or the domain Bacteria; organisms with eukaryotic cells belong to the domain Eukarya.

What is the maximum domain name length?

Format of a domain name Each element of a domain name separated by [.] is called a “label.” The maximum length of each label is 63 characters, and a full domain name can have a maximum of 253 characters. Alphanumeric characters and hyphens can be used in labels, but a domain name must not commence or end with a hyphen.

Is the sub tree of domain name space?

A domain is a subtree of the DNS name space. A Domain can further divided in to sub-domains. In Domain Name System (DNS) inverted tree structure, top is called the Root. The Root is represented by an empty string “”.

What domain Cannot be?

Domains can be restricted if: the function is a rational function and the denominator is for some value or values of. the function is a radical function with an even index (such as a square root), and the radicand can be negative for some value or values of .