GOALS OF NETWORKING  

PROTOCOLS

 

LAYERED ARCHITECTURE

 

THE OSI REFERENCE MODEL

 

Layer 1 - Physical Layer

Layer 2 - Data Link Layer Layer 3 - Network Layer Layer 4 - Transport Layer Layer 5 - Session Layer Layer 6 - Presentation Layer Layer 7 - Application Layer  
MODES OF SERVICE  
CLIENTS AND SERVERS  
SERVICES  
SERVERS

CLIENTS

 
ADDRESSES  
Some definitions:
 

Out-of-Band Data (or expediated data)

In order to communicate, host must speak the same protocol.
Each layer of the OSI Model has it's own protocol. If you change the protocol at one layer on a host, you must change it on all other hosts.

Ethernet:

Details of TCP/IP: IP Addresses