Table of Contents
The Domain Name System
Some DNS topics
What the Internet’s DNS
is
A systematic namespace - the
domain name space
Why use hierarchical
names?
What are domain names used
for?
Examples of domain
names
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Different uses of the term
“domain”
Other information mapped to
domain names
Different people responsible
for diff. parts
What is a zone? (1)
What is a zone? (diagram
1)
What is a zone? (2)
What is a zone? (diagram
2)
What is a zone? (3)
What is a zone? (diagram
3)
Information is associated with
each domain name
General format of RRs
Several types of RRs
IP address for a host
Information needed by the DNS
infrastructure itself
SOA record
NS record
SOA and NS record
example
SOA and NS example using some
shortcuts
More about RRs above and below
zone cuts
Zone cut example - RRs in the
child zone
Zone cut example - RRs in the
parent zone
Hostname for an IP
address
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Information about mail
routing
Free form text
Alias to canonical name
mapping
A set of conventions for using
the information
The DNS is a distributed
database system
What makes it a distributed
database?
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How is data partitioned
amongst the servers?
What about
reliability?
DNS Protocols
What kinds of questions can
clients ask?
The resolver/server
model
The resolver/server model
(diagram)
What if the server does not
know the answer?
Master and slave
servers
Location of servers
Configuring a resolver on a
Unix-like system
resolv.conf example
Configuring a nameserver on a
Unix-like system
named.boot example
named.conf example
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Exercise
Exercise
Exercise
Exercise
Exercise
Exercise
Exercise
Exercise
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