Notes for Computer Information Technology 160
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October 17 - DNS


  • DNS - Domain Name System
    • Zones
    • Resolver
      • HINTS File
  • Local Setup
    • /etc/nsswitch.conf
    • /etc/hosts
    • /etc/resolve.conf

Ping of Death - when so many pings for the purpose of disruption that no legitimate internet traffic can get through, this was an issue about 15 years ago, and to this day ICMP is still blocked on many university networks


  • Top Level Domains: com, biz, edu, net, etc…
  • .onion is not in the Internet DNS root, but with the the tor binary installed, .onion domain names can be accessed
  • Every time you go up a level you add a dot,
  • = /edu/csun/sandbox/ns1