شبكات الحاسب

The word data refers to information presented in whatever form is agreed upon by the parties creating and using the data.

• telecommunication,

• Data communications

• Network

is the interconnection of a set of devices capable of communication.

• telecommunication

• Data communication

• network

A device can be a host (or an end system as it is sometimes called) such as a laptop, workstation.

• telecommunication

• Data communication

• Network

A device can be a connecting device such as a router, which connects the network to other networks, a switch, which connects devices together.

• telecommunication

• Data communication

• Network

are connected using wired or wireless transmission media such as cable.

• 
  telecommunication

• Data communication

• Network

are the exchange of data between two devices via some form of transmission medium such as a wire cable.

• telecommunication

• Data communication

• Network

The effectiveness of a ............................................. system depends on four fundamental characteristics: delivery, accuracy, timeliness, and jitter.

• telecommunication

• Data communication

• Network

The system must deliver data to the correct destination. Data must be received by the intended device or user and only by that device or user.

• Delivery

• Accuracy

• Timeliness

• Jitter

The system must deliver the data accurately. Data that have been altered in transmission and left uncorrected are unusable.

• Delivery

• Accuracy

• Timeliness

• Jitter

The system must deliver data in a timely manner. Data delivered late are useless. In the case of video and audio, timely delivery means delivering data as they are produced, in the same order that they are produced, and without significant delay.

• Delivery

• Accuracy

• Timeliness

• Jitter