Networks

Networks

1. Networks

   • Network Topologies
   • Protocols
     • HTTP
       • HTTPS
       • Used for requesting HTML files from webservers
     • FTP
       • (File Transfer Protocol) Used for transferring files between computers.
     • POP3
       • (Post Office Protocol) Used for downloading emails from a mail server.
     • SMTP
       • (Simple Mail Transfer Protocol) Used for uploading emails to a mail server
     • IMAP
       • (Internet Message Access Protocol) It is used to read emails from a mail server. No need to download mail.
     • TCP/IP Layers
       • ATNDP
         • Application Layer
           • Provides applications services to users and programs.
         • Transport Layer
           • Handles data-consistency functions (Error Checking).
         • Network Layer
           • Provides network addressing (ip addresses)
         • Data Link Layer
           • Prepares and corrects data to be passed to the physical layer.
         • Physical Layer
           • Transmits and receives data.
   • IPs
     • Addresses
       • (Internet Protocols) are addresses unique identifies assigned to computers on a TCP/IP network.
         • IPV4 (32-bit) = 2 to the power of 32 IPV6 (128-bit) = 2 to the power of 40
     • DNS
       • (Domain Name System) This is a system to store domain names and look up their IP addresses.
   • Packet and Circuit Switching
     • Circuit Switching is an established path across the network that is locked and remains open for the duration of the communiacation.

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