DNS is a vital service on the Internet and if you are working towards your CCNA or a career in tech, you need to understand DNS. This video covers how DNS works, what happens in the DNS request process and also covers setting up a Cisco router as a DNS resolver. I also go over what happens when a DNS failure occurs, showcasing a real life example of a DNS failure on AWS as explained by this Cisco ThousandEyes report: Reference video produced by David Bombal: If you like this video, you should also take a look at these: Complete IP subnetting guide: Intro to IP routing: If you are looking to start or grow your career in computer networking, take a look at these books (Affiliate links): Cisco CCNA Official Cert Guide Library: Amazon Paperback: Amazon Kindle: CCNP and CCIE Enterprise Core ENCOR 350-401 Official Cert Guide: Amazon Paperback: Amazon Kindle: Chapters: 0:00 - Intro 1:39 - What is DNS 3:41 - DNS Lookup Process & Server Types 17:44 - Looking at DNS packets 21:48 - DNS Record Types 28:33 - What happens when DNS fails? 40:56 - Configuring a Cisco Router as a DNS resolver 52:54 - Additional local DNS server option - Bind