TCI/IP, IP, DNS

TCI/IP, IP, DNS

1. ATNDP

   • Application Layer
     • Provides application services
   • Transport Layer
     • Handles data consistency functions
   • Network Layer
     • Provides network addressing and routing
   • Data link Layer
     • Prepares and collects data
   • Physical Layer
     • Receives

2. IP Addresses and DNS

   • IPv4
     • Run out
     • >4.2 billion devices
       • Not enough IP's
   • IPv6
     • 128 bit address
     • 2^128 possibilities
       • 340000000000000000000000000000000000000
     • 100+ addresses for every atom

3. DNS

   • Every computer is identified by IP
   • Fine for PC but not for people
   • Domain Name System
     • system to store domain names and look up IP addresses
       • e.g www.catmosecollege.com
   • When type web address into browser, ISP sends domain to server
     • returns IP address
     • Internet Service Provider
   • DNS large address book

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