The Domain Name System (DNS)
The Domain Name System
(DNS)
Raj Jain
The Ohio State University
Columbus, OH 43210
Jain@CIS.Ohio-State.Edu
Raj Jain
The Ohio State University
24-1
Overview
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Naming hierarchy
Server hierarchy
Name resolution
Other information in name servers
Raj Jain
The Ohio State University
24-2
Why Names?
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Computers use addresses
Humans cannot remember IP addresses
? Need names
Example, Liberia for 164.107.51.28
Simplest Solution: Each computer has a unique name
and has a built in table of name to address translation
Problem: Not scalable
Solution: DNS (Adopted in 1983)
Hierarchical Names: Liberia.cis.ohio-state.edu
Raj Jain
The Ohio State University
24-3
Name Hierarchy
Unnamed root
com
edu
gov
au
dec
ohio-state
nsf
co
cis
netlab
ee
...
us
va
reston
cnri
Raj Jain
The Ohio State University
24-4
Name Hierarchy
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Unique domain suffix is assigned by Internet
Authority
The domain administrator has complete control over
the domain
No limit on number of subdomains or number of
levels
computer.site.
computer.site.subdivision.
Domains within an organization do not have to be
uniform in number of subdomains or levels
Raj Jain
The Ohio State University
24-5
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