summary dns dns alexandra tolbert benefits how it works basics katherine barrios dns parts phillip...
TRANSCRIPT
Summary
DNSDOMAIN NAME SYSTEM
AlexandraTolbertBenefitsHow It WorksBasics
Katherine BarriosDNS Parts
Phillip Nelson
DNS is the foundation for name resolution in a TCP/IP
network
BASICS
Used most by web browsers a
nd email programs
Locates servers
Makes a user friendly name of a computer to
it’s IP address
DNS is commonly asso
ciated with the Internet
DNS is commonly asso
ciated with the Internet
Server names remain constant
Server names remain constant
Easier to remember than numeric IP addressesConvenience
Consistency
Simplicity
“.”
com.edu. us.org.
lsu.edu. google.com. gov.us.
Domain Name Space
lsu.edu.
moodle2.lsu.edu. business.lsu.edu. isds.lsu.edu.
Domain Name Space
computer1.business.lsu.edu.server1.business.lsu.edu.
“.”
com.edu. us.org.
lsu.edu.
moodle2.lsu.edu. business.lsu.edu. isds.lsu.edu.
lsu.edu.
business.lsu.edu. webserver1.business.lsu.edu.
webserver1.business.lsu.edu.
Domain Name Space
webserver1.business.lsu.edu.webserver1.business.lsu.edu.webserver1.business.lsu.edu.webserver1.business.lsu.edu.webserver1.business.lsu.edu.webserver1.business.lsu.edu.
Host Sub Domain
2nd Level Domain
Top Level
Domain
Root
Domain Name Space
lsu.edu.
moodle2.lsu.edu. business.lsu.edu.isds.lsu.edu.
Zones
Name Server
lsu.edu.
moodle2.lsu.edu.business.lsu.edu.
isds.lsu.edu.
Name ServerPrimary Zone Database File
Secondary Zone database file
Name Server
Name Resolution Process
“Hey, I need directions to
http://www.lsu.edu”
Client
“ The domain name www.lsu.edu is not in my database or cache. I’ll try another DNS server.”
Local Server
“I have authority to find that address! I will send a list of IP addresses for the edu. domain”
RootServer
RootServer
“Great! I’ll ask edu. For the correct address.”
Local Server
“Here is the IP address to the requested site.”
Lsu.edu Server
“Thanks! I will forward this to the client and keep the address in my cache for awhile.”
Local Server
“Thanks for the directions! Now to pay my fee bill on lsu.edu”
User Friendly Name (Host Name) IP Address
Apple.com 17.149.160.49
Koofers.com 23.23.109.128
Microsoft.com 192.168.2.1
Pintrest.com 23.21.123.64
Twitter.com 199.59.148.10
Walmart.com 161.170.248.20