Notes for Computer Information Technology 160
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oct17-dns.md 927B

October 17 - DNS

Overview

  • 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

DNS

  • 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, subdomain.domain.top-level-doman.
  • ns1.sandbox.csun.edu. = /edu/csun/sandbox/ns1
  • DNS Iterator - looks at HINTS file, searches first from top level domain then lower on the list