Networking Chapter 3

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Three Elements of Communication

Source: Message source, or sender. Message sources are people, or electronic devices, that need to send a message to other individuals or devices.

Destination: Destination, or receiver, of the message. The destination receives the message and interprets it.

Channel: A channel, consists of the media that provides the pathway over which the message can travel from source to destination.

Predetermined Rules in a network- Protocols

An identified sender and receiver

Agreed upon method of communicating (face-to-face, telephone, letter, photograph)

Common language and grammar

Speed and timing of delivery

Confirmation or acknowledgement requirements

Two Types of Networking Models

Protocol Model - its an actual implemented working model that provides a model that closely matches the structure of a particular protocol suite.

e.g

The TCP/IP model is a protocol model because it describes the functions that occur at each layer of protocols inside the TCP/IP Suite.

Reference Model -

Accessing Local Resources MAC IP Ports A data frame contains 3 unique address Types: 1.MAC Address (Physical) at Network Access Layer. 2.IP Address (Logical) at Internet Layer 3.Port Numbers at Transport Layer.

•The IP address help the packet find the right network. •The MAC address help the packet find the right host on the right network. •The port number help the packet find the right application on the right host on the right network.

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protocol and reference models

moving data in a network