What is DNS? Introduction to Domain Name System. SXSW giveaway!

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What is DNS (Domain Name System)? How does DNS actually work? This video shows you practical examples of DNS in real time and includes Wireshark captures showing you actual DNS query and answer messages.

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Giveaways:
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Wireshark Course: See hidden link in video
SDN Course: See hidden link in video
Linux Course: See hidden link in video

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Menu:
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What does DNS do? 00:00
Why do we use DNS? 2:10
Analogy of DNS: 4:00
SXSW: 5:25
Practical DNS: 7:30
Lab: 8:20
Wireshark capture of DNS: 9:50
Edit Windows host file: 15:45
Use a Cisco router as a DNS server: 18:22
nslookup IPv4 / IPv6: 23:09
Rogue DNS example: 24:35
Ubuntu DNS server setup (dnsmasq): 25:47

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CCNA content:
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Dnsmasq setup:
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sudo systemctl disable systemd-resolved
sudo systemctl stop systemd-resolved

nameserver 8.8.8.8

Now install dnsmasq
sudo apt install dnsmasq

uncomment these lines:
port=53
domain-needed
bogus-priv
no-resolv

Add your domains below the no-resolv line:

Set your public server to Google for example:
server=8.8.8.8

DNS
DHCP
EVE-NG
GNS3
VIRL
Packet Tracer
10x Engineer
CCNA
Cisco Devnet Associate

CCNP Enterprise
CCNP Security
CCNP Data Center
CCNP Service Provider
CCNP Collaboration
Cisco Certified Devnet Professional
Cisco Certified Network Professional

LPIC 1
LPIC 2
Linux Professional Institute
LX0-103
LX0-104
XK0-004

Please note that links listed may be affiliate links and provide me with a small percentage/kickback should you use them to purchase any of the items listed or recommended. Thank you for supporting me and this channel!

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#dns #sxsw #wireshark

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Menu:
What does DNS do? 00:00
Why do we use DNS? 2:10
Analogy of DNS: 4:00
SXSW: 5:25
Practical DNS: 7:30
Lab: 8:20
Wireshark capture of DNS: 9:50
Edit Windows host file: 15:45
Use a Cisco router as a DNS server: 18:22
nslookup IPv4 / IPv6: 23:09
Rogue DNS example: 24:35
Ubuntu DNS server setup (dnsmasq): 25:47

Giveaways:

Wireshark Course: See hidden link in video
SDN Course: See hidden link in video
Linux Course: See hidden link in video

CCNA content:

Dnsmasq setup:

sudo systemctl disable systemd-resolved
sudo systemctl stop systemd-resolved
#Option 1: Edit the /etc/resolv.conf file to contain the following entry:
nameserver 8.8.8.8
#Option 2:
sudo rm /etc/resolv.conf
echo "nameserver 8.8.8.8" > /etc/resolv.conf
#Now install dnsmasq
sudo apt install dnsmasq
#uncomment these lines:
port=53
domain-needed
bogus-priv
no-resolv
#Add your domains below the no-resolv line:

#Set your public server to Google for example:
server=8.8.8.8

davidbombal

Very informative! I appreciate your understanding that some people are just getting into this topic and taking the time to explain how the little things come into play

shaggy

Great to see you getting the support of sponsers, David. And so long as they're meeting your standards (ie high quality/no scammers) then it can only be a positive thing, imo!

IPvZero

When nothing in life works, just listening to your videos restore hope

affreenmjha

Thank you so much David i have got all three courses however last month I purchased your SDN tutorials from Udemy but still got Linux and wireshark free.
I am so happy...thanks David
I wish you get more sponsors

lokeshkatiyar

I got all the 3 free courses, thank you David for the new learning materials, have a nice week 💙.

taherkhedher

Great way to begin the new year, congrats for continuing with the giveaways, is a good way to keep us motivated and continuing learning.

zelaznog

OMG thank you so much for the giveaway!!! I Cant believe you are giving away your Linux and Wireshark course!

NinjaScorpio

Thank you very much for this content. I've been looking for a good DNS tutorial for a while now!

daddy

Very useful video! Seeing how this process is captured on wireshark clarified the whole process for me. Thank you.

damianentropy

You are a great man ! your Youtube channel is the most valuable in IT

medinusa

Thanks for the informative DNS subject material as well as being super polite <3. I am backtracking your catalog as I came to your channel this year.

genezor

Thanks David for another great video! Good job!

johnnykingston

Excellent David, kept pretty general highlighting the important things. Thanks again for the great information, and regarding the sponsorship of companies for your videos, of course I believe it's a win win for everyone 👍 have a great day and until then.

jairusan