330 Chapter (1) Introduction to data communication

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

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.

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

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

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

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

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.

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.

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

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

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

Ethernet is an example of a network layer protocol.

is a pathway or connection between client and server