Application Layer

• Applications that interact directly with"User"

• Data is sent using the format "certain" to Transport Layer

• example: telnet, ftp, smtp

Transport Layer

• Dealing with delivery to "host" the purpose
• Two of the most important protocol in this layer is
• TCP, connection-oriented
• UDP, connectionless

Internet Layer

• Handles routing a datagram to the destination
• Conducting Fragmentation and Defragmentation
  
• The most important protocol, Internet Protocol (IP) and
  
• Internet Control Message Protocol (ICMP)

Network Access Layer

• Dealing with relationship to the NIC
• Determining the big package
  
• Convert IP to the machine address