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The Internet relies on domain names and domain name resolution service to turn the names we can remember, into the IP addresses computers use to contact each other and communicate. Domain name resolution service starts with the address you type into your web browser, email or your file transfer client.

This set of tutorials on DNS explains how DNS operates and functions. This is necessary knowledge for passing the CCNA, CCNP, CCIE, JNCIE, Network+ and other certification exams.

  1. The DNS System
  2. The DNS Hierarchy of DNS Servers
  3. The DNS Root NIC
  4. DNS Resolution

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