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Network Services (DNS (Root Domain (Top-Level Domains (Second Level…

- - - - Devices assigned host names (easier to identify)
        
        DNS database holds names mapped to IPs
  - - - qa.com = domain
  - - - Second Level domains
        
        google
      - com
  - - - If it doesn't have it, requests from other DNS Servers
        
        Response from other server? Caches information for future
  - - - Computers and servers can be clients
  - - - DNS Server checks - Zone in database? = authoritative
        
        YES?
        
        searches zone, sends answer
        
        NO?
        
        searches cache
        
        mapping found, sends answer to client
        
        mapping not found, forwarders configured?
        
        NO? ITERATIVE QUERY
        
        Root hint servers
        
        YES? RECURSIVE QUERY
- - - - Offer
        
        Request
        
        Acknowledgement
        
        Server
        
        DHCP Acknowledgement.
        DHCPNACK if IP originally offered no longer available
        
        Client
        
        Receives offer, BROADCASTS request
        
        This tells server offer is accepted
        
        Server
        
        DHCP offer packet
        
        UNICAST
      - DHCP discover packer to EVERY device on subnet
        
        BROADCAST
      - Client