Sy Le CS 147

 Process of transferring information between computers virtually anywhere in the world.

 LAN (Local Area Network) : A network of computers within a close distance via physical Ethernet cord or Wireless Connection  Example: Room, Building, Campus or a city  WAN (Wide Area Network) : connects LAN networks and other network together for further mutual communication  Example: The Internet

 IP (Internet Protocol)  Numerical number assigned to each device in a network utilizing the Internet Protocol for communication among devices  IP Address is defined as a 32-bit number  Host Identification: An address indicates where it is  Local Addressing : A route indicates how to get to each component

 IANA (Internet Assigned Number Authority)  Manages and Allocates IP Address Globally  IANA works with 5 Regional Internet Registries to allocate IP Address blocks to local Internet Service Providers

 OSI Open System Interconnection Reference Model  An abstract description for layered communications and computer network protocol design

 Closest to the end user, which means that both the OSI application layer and the user interact directly with the software application  Example : Hypertext Transfer Protocol (HTTP), File Transfer Protocol (FTP), Simple Mail Transfer Protocol (SMTP) and X.400 Electronic Mail.

 Establishes a context between Application Layer entities, in which the higher-layer entities can use different syntax and semantics, as long as the presentation service understands both and the mapping between them

 Controls the dialogues (connections) between computers  Establishes, manages and terminates the connections between the local and remote application  Example: Application Environments that use remote procedure calls

 Provides transparent transfer of data between end users, providing reliable data transfer services to the upper layers.  Example: Transmission Control Protocol (TCP) and User Datagram Protocol (UDP).

 Provides the functional and procedural means of transferring variable length data sequences from a source to a destination via one or more networks, while maintaining the quality of service requested by the Transport Layer.  Example: Internet Protocol (IP)

 Correct errors that may occur in the Physical Layer  This layer was intended for point-to-point and point-to-multipoint media, characteristic of wide area media in the telephone system.

 defines the electrical and physical specifications for devices.  tell one device how to transmit to the medium, and another device how to receive from it

 Wikipedia.org  Textbook

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