summary dns dns alexandra tolbert benefits how it works basics katherine barrios dns parts phillip...

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