330 Chapter (1) Introduction to data communication

occurs when a higher level PDU is placed inside of a lower level PDU

In the OSI model, the application layer is the end user’s access to the network.

is a pathway or connection between client and server

A local area network (LAN) connects other LANs and BNs located in different areas to each other and to wide area networks in a span from 3 to 30 miles.

A car manufacturer may give access to certain portions of its network to some of its suppliers via Internet. This is an example of an Extranet.

Telecommunications is the transmission of voice and video as well as data and implies transmitting a longer distance than in a data communication network.

An intranet is a LAN that uses Internet technologies and is publicly available to people outside of the organization.

The high bandwidth requirements (high communications needs) for video have slowed its integration into computer networks.

At the transport layer in the Internet model, TCP is responsible for breaking large files received from the application layer into smaller packets and opening a connection to a server for transferring the packets.

Ethernet is an example of a network layer protocol.

Data communication standards enable each layer in the sending computer to communicate with its corresponding layer in the receiving computer.

The network layer is responsible for routing messages from the source computer to the destination computer.

The OSI model is the most widely used network model to develop and build networks today.