DNS Basics 1 Computers use IP Addresses To send an IP datagram to - PowerPoint PPT Presentation

Aug 12, 2023 •129 likes •214 views

DNS Basics 1 Computers use IP Addresses To send an IP datagram to another computer on Internet (e.g. a web server), must know its IP address What is the IP address of the computer running ICT website? Registration? Facebook? Humans

DNS Basics 1
Computers use IP Addresses ● To send an IP datagram to another computer on Internet (e.g. a web server), must know its IP address ● What is the IP address of the computer running ICT website? Registration? Facebook? ● Humans prefer words (compared to numbers) ● Domain names identify computers in Internet ● What is domain name of ICT website? Registration? Facebook? ● All computers in Internet have IP address; some (usually servers) also have domain name 2
gTLD = Generic Top Level Domain ccTLD = Country Code TLD 3
Domain Name System (DNS) ● Map domain names to IP addresses ● Clients have DNS Resolver, configured with IP address of 1 or more DNS Servers ● /etc/resolv.conf ● DNS servers store mappings from domain to IP ● Server operators register their domain/IP with DNS server ● DNS protocol ● Request/Response ● UDP, Server port 53 ● Hierarchy of DNS servers ● Authoritative server is where domain/IP originally registered ● Caching used in resolvers and DNS Servers 4
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Hosts file ● /etc/hosts ● List of local mappings of hostname to IP ● Used in addition to DNS 8

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