TCP/IP and OSI Model

 

 

TCP/IP Protocol Suite

n Host-to-network : Physical and data link layer

¨ No specific protocol

n Network layer

¨ IP(Internet Protocol), ARP(Address Resolution Protocol), RARP(Reverse ARP), ICMP(Internet Control Message Protocol), IGMO(Internet Group Message Protocol)

n Transport layer

¨ TCP(Transmission Control Protocol), UDP(User Datagram Protocol), SCTP(Stream Control Transmission Protocol),

n Application Layer

¨ Combined session, presentation, and application layers

 

Addressing

n Four levels of addresses in TCP/IP protocols

n Physical (link), logical (IP, network), port, and specific addresses

 

 

 

Relationship of Layers and Addresses

 

Physical Address

n A node with physical address 10 sends a frame to a node with physical address 87. The two nodes are connected by a link (bus topology LAN). As the figure shows, the computer with physical address 10 is the sender, and the computer with physical address 87 is the receiver.

 

Logical (IP) Address

 

 

 

n The physical addresses will change from hop to hop, but the logical addresses usually remain the same

Port Address

n The physical addresses change from hop to hop, but the logical and port addresses usually remain the same

 

Specific Address

n Some application have user-friendly addresses that are designed for that specific address