DNS is beautiful

DNS or Domain Name System, despite its drawbacks, is brilliantly designed for scale. We can learn few lessons from this protocol especially when designing our own apps. This episode of the backend engineering show I go through how DNS works, the pros and the cons and attacks that happened on this system.

0:00 Intro
2:00 Overview DNS
7:40 How DNS works (Details)
15:44 DNS uses UDP
19:30 DNS Poisoning
24:10 is DNS really distributed?
26:30 How Attackers Abuse DNS
30:30 How Chrome overloaded the ROOT servers for 12 years

Resources

Fundamentals of Networking for Effective Backends udemy course (link redirects to udemy with coupon)

Fundamentals of Database Engineering udemy course (link redirects to udemy with coupon)

Introduction to NGINX (link redirects to udemy with coupon)

Python on the Backend (link redirects to udemy with coupon)

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Stay Awesome,
Hussein

[briandsouza]

Your content is so worth the time! Thank you for making it captivating in your own unique way. I'm a network engineer and I can't tell you how much what you say helps me expand my horizons!

[rohrvy]

First I thought ok it was just DNS basics..but as you progressed through and explain DNS cache poisoning and Chrome bug.. it became a worth to watch video

[WiktorJurek]

Love it! You always get taught about DNS, but you never get taught about the sheer brilliance to be able to deliver such a service *at scale*. Thanks, Hussein.

[derickasamani]

As a network engineer I just love hearing Hussein take on DNS, it makes me appreciate some of the decisions developers have to make.

[faizalimuhammadzoda]

Love it. Thanks for taking time to make this precious tutorial.

BTW, you seem to feel so relaxed when you talk.

[eyondev]

I was just having DNS problems the other day. I hope this will be useful.

[kalpakHere]

There's nothing without problems, at the end of the day.

Nice way to wrap it all up :)

[poiiihy]

Instead of partitioning with TLDs, couldnt they have partitioned by letters of the domain? Like as if the first or last letter was a tld without the dot.

[Mikhai_nik]

I use G-core's DNS hosting. 10-15 ms. Unlike Cloudflare, u can configurable DNS balancing by coordinates. Balancing by IP, ASN, countries, or continents with GeoDNS. DNS still coolest thing

[kornelijussliubauskas]

I might think this would sound deadly simple to understand for some, but as through my self taught programming journey I still have no colorful view of base64 encoding. Peeked at your channel ad didn't found nothing about it. So asking you a favor for creating video about base64 encoding, what problems it "was" solving and current benefits of it. Thank you.

[Crupanshu]

Really nice insights...
FYI I'm definitely going to look up for "Grandma for Hire" at least on surface web.

[gnricnam]

My only question is, how does the tld server know the authoritative server is the right one for the domain?

[BennyKleykens]

DNS never goes down. That's the beauty of it. Just like the Internet never goes down.

[peterszarvas]

So Google was DDoS-ing the DNS root servers for 10 years, haha

[bubulray]

Damn... Those attackers who hacked apple really got big brains. 😂

[zainabalhaidary]

Who here made it to the grandmas for hire part? 😅

[FilthySnob]

'DNS is beautiful'
no you're beautiful

[gugocharade]

Let's say i have a company which has a private network and i want a DNS server, how can i do that ?

[MukeshKumar-vvwd]

I really like your videos, but it would be better if you show some tools / code and demonstrate whatever you're saying.

[maximus]

Btw, how could DNS spoof work in modern internet as browsers check for certificates?