I INF 453 Lecture Notes - Lecture 5: Not Safe For Work, Botnet, Phishing
2 Jun 2018
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DNS
DNS Review - is a hierarchical decentralized naming system for computers, services, or other resources
connected to the Internet or a private network.
History:
The Internet Engineering Task Force published the original specifications in RFC 882 and RFC 883 in
November 1983.
In 1984, four UC Berkeley students, Douglas Terry, Mark Painter, David Riggle, and Songnian Zhou,
wrote the first Unix name server implementation for the Berkeley Internet Name Domain, commonly
referred to as BIND.
In November 1987, RFC 1034 and RFC 1035] superseded the 1983 DNS specifications. Several
additional Request for Comments have proposed extensions to the core DNS protocols.
DNS Tree:
DNS Queries: Recursive vs. Iterative
Recursive - A recursive query is a kind of query, in which the DNS server, who received your query will
do all the job of fetching the answer, and giving it back to you. During this process, the DNS server might
also query other DNS server's in the internet on your behalf, for the answer.
Iterative - In an iterative query, the name server, will not go and fetch the complete answer for your
query, but will give back a referral to other DNS server's, which might have the answer. In our previous
example our DNS server 172.16.200.30, went to fetch the answer on behalf of our resolver, and
provided us with the final answer.
DNS Registrars - an organization that manages the reservation of Internet domain names. A domain
name registrar must be accredited by a generic top-level domain (gTLD) registry or a country code top-
level domain (ccTLD) registry.
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Dns review - is a hierarchical decentralized naming system for computers, services, or other resources connected to the internet or a private network. The internet engineering task force published the original specifications in rfc 882 and rfc 883 in. In 1984, four uc berkeley students, douglas terry, mark painter, david riggle, and songnian zhou, wrote the first unix name server implementation for the berkeley internet name domain, commonly referred to as bind. In november 1987, rfc 1034 and rfc 1035] superseded the 1983 dns specifications. Several additional request for comments have proposed extensions to the core dns protocols. Recursive - a recursive query is a kind of query, in which the dns server, who received your query will do all the job of fetching the answer, and giving it back to you. During this process, the dns server might also query other dns server"s in the internet on your behalf, for the answer.
