Fasthosts Techie Test competition is now closed! Learn more about Fasthosts here: https://www.fasthosts.co.uk/davidbombal 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. ====================== Giveaways: ====================== SXSW Trip: https://www.fasthosts.co.uk/davidbombal Wireshark Course: See hidden link in video SDN Course: See hidden link in video Linux Course: See hidden link in video ====================== 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 ====================== CCNA content: ====================== Free CCNA content:    • Packet Tracer: CCNA Exam labs   CCNA course: http://bit.ly/2PmTVPD ====================== Dnsmasq setup: ====================== sudo systemctl disable systemd-resolved sudo systemctl stop systemd-resolved Edit the /etc/resolv.conf file to contain the following entry: 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: address=/r1.home.com/10.1.1.254 address=/myrouter.home.com/10.1.1.254 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! ======================== #dns #sxsw #wireshark