DNS

Brief Refresher

• RFC 1035
• Uses many ports and protocols
• TLD
  • Top-level domain
  • Highest level in hierarchical domain system
  • Installed at in the root zone of the name space
  • .com, .gov, .ie, .edu
• Authoritative
  • Store DNS record information
  • Usually a DNS hosting provider or registrar
• Recursive
  • Middleman between authoritative servers and end-user
  • Resolving server
  • Usually ISP
• Fully Qualified Domain Name
  • FQDN
  • Two parts:
    • Hostname
      • First part of FQDN, ex. mymail.champlain.edu's hostname is mymail
    • Domain
      • Second part, ex. champlain.edu

Dynamic DNS

• Automatically updating a name server in DNS in real time
• Can access website or server from anywhere without having to change IP address
• No manual DNS update needed when IP changes
• Don't need to reconfigure for each IP change