.
-as of [22 MARCH 2024]–
.
.
.
-the domain name system (DNS) is a ‘hierarchical de-centralized naming system’ for [‘computers’ / ‘services’ / any ‘resource’ connected to the ‘internet’ or ‘private network’]-
.
(it associates various information with ‘domain names’ assigned to each of the ‘participating entities’)
(most prominently, it translates more ‘readily memorized domain names’ to the ‘numerical IP addresses’ needed for the purpose of ‘locating’ + ‘identifying’ computer services + devices with the ‘underlying network protocols’)
(by providing a ‘worldwide distributed directory service’, the ‘domain name system’ is an essential component of the ‘functionality’ of the ‘internet’, and has been in use since the ‘1980s’)
(the ‘domain name system’ delegates the responsibility of assigning ‘domain names’ + mapping those names to ‘internet resources’ by designating ‘authoritative name servers’ for each ‘domain’)
(‘network administrators’ may delegate ‘authority’ over ‘sub-domains’ of their ‘allocated name space’ to other ‘name servers’)
(this mechanism provides ‘distributed’ + ‘fault tolerant service’ and was designed to avoid a ‘single large central database’)
(the ‘domain name system’ also specifies the ‘technical functionality’ of the ‘database service’ that is at its ‘core’)
(it defines the ‘DNS protocol’, a ‘detailed specification’ of the ‘data structures’ + ‘data communication exchanges’ used in the ‘DNS’, as part of the ‘internet protocol suite’)
(historically, other ‘directory services’ preceding ‘DNS’ were not ‘scalable’ to ‘large’ (or ‘global’) directories as they were originally based on ‘text files’, prominently the ‘HOSTS.TXT resolver’)
.
(the ‘internet’ maintains ‘2 principal namespaces’…)
the *’domain name hierarchy’*
.
the *’internet protocol (‘IP’) address spaces’*
.
(the ‘domain name system’ maintains the ‘domain name hierarchy’ + provides ‘translation services’ between it and the ‘address spaces’)
.
(‘internet name servers’ + a ‘communication protocol’ implement the ‘domain name system’)
.
(a ‘DNS name server’ is a server that stores the ‘DNS records’ for a ‘domain’; a ‘DNS name server’ responds with ‘answers’ to ‘queries’ against its ‘database’)
.
(the most common types of ‘records’ stored in the ‘DNS database’ are for…)
“start of authority”
(SOA)
.
“IP addresses”
(A + AAAA)
.
“SMTP mail exchangers”
(MX)
.
“name servers”
(NS)
.
“pointers for ‘reverse DNS lookups'”
(PTR)
.
“domain name aliases”
(CNAME)
.
(although not intended to be a ‘general purpose database’, ‘DNS’ can store ‘records’ for other types of ‘data’ for either…)
‘automatic lookups’
(such as DNSSEC records)
‘human queries’
(such as ‘responsible person (RP) records’)
.
(as a ‘general purpose database’, the ‘DNS’ has also been used in combating ‘unsolicited email’ (aka ‘spam’) by storing a ‘real-time blackhole list’)
.
(the ‘DNS database’ is traditionally stored in a ‘structured zone file’)
.
.
*👨🔬🕵️♀️🙇♀️*SKETCHES*🙇♂️👩🔬🕵️♂️*
.
.
.
👈👈👈☜*“INTERNET CONNECTIONS”* ☞ 👉👉👉
.
.
💕💝💖💓🖤💙🖤💙🖤💙🖤❤️💚💛🧡❣️💞💔💘❣️🧡💛💚❤️🖤💜🖤💙🖤💙🖤💗💖💝💘
.
.
*🌈✨ *TABLE OF CONTENTS* ✨🌷*
.
.
🔥🔥🔥🔥🔥🔥*we won the war* 🔥🔥🔥🔥🔥🔥