Topicme5106087c6291f20_1528449000663_0Topic

Network protocols

Levelme5106087c6291f20_1528449084556_0Level

Second

Core curriculumme5106087c6291f20_1528449076687_0Core curriculum

Grade VII and VIII

III. Using the computer, digital devices and computer networks. The student:

1) schematically presents the structure and operation of a computer network, a school and home network and the Internet.

Timingme5106087c6291f20_1528449068082_0Timing

45 minutes

General objectiveme5106087c6291f20_1528449523725_0General objective

Identifying the notions related to a computer network.

Specific objectivesme5106087c6291f20_1528449552113_0Specific objectives

1. Describing a network protocolnetwork protocolnetwork protocol.

2. Identifying transmission media.

3. Distinguishing between the TCP/IP model and the OSI model.

Learning outcomesme5106087c6291f20_1528450430307_0Learning outcomes

The student:

- describes the operation of network protocols and distinguishes between the TCP/IP model and the OSI model.

- identifies the various types of tramsmission media and modems.

Methodsme5106087c6291f20_1528449534267_0Methods

1. Sentence completion.

2. Learning through observation.

Forms of workme5106087c6291f20_1528449514617_0Forms of work

1. Individual work.

2. Class work.

Lesson stages

Introductionme5106087c6291f20_1528450127855_0Introduction

The task of the students is to revise the information about the tasks of a computer network. They order the information in this area by using the sentence completion method.

The tasks of a computer network:

- exchanging data between_____________ (e.g. computers),

- the shared use of peripheral devices, e.g._____________ (e.g. printers, scanners),

- facilitating the administration of _____________ (e.g. computers),

- centralized backup of _____________ (e.g. data, files),

- communication between _____________ (e.g. users, computers),

- running programmes on _____________ (e.g. remote computers).

Procedureme5106087c6291f20_1528446435040_0Procedure

What is a network protocolnetwork protocolnetwork protocol?

A protocol is a set of rules that specify the principles of communication. Over the years many various protocols have been developed, thanks to which different effects can be achieved, e.g.:

- the transmission of files,
- making telephone calls,
- synchronizing the game status in computer games,
- data encryption,
- data compression,
- money transfer.

Most computer applications operate based on the HTTP and HTTPS protocols. All protocols are treated as the stream of bytes by computer equipment and mediation devices and are transmitted to a location where they have been addressed to. Software is responsible for identifying a communication protocol. Computer systems usually do not use one protocol but a set of cooperative protocols which are called the protocol stack.

Data transmissiondata transmissionData transmission is the process of transfering data along a specified way between devices defined in a „language” which is understandable for all devices. More than one recipient can take part in the process.

Comminication systems communicate between one another by using transmission media. They can be classified as wired and wireless (radio or light waves).

[Interactive graphics]

The most popular protocol stacks include two models:

- TCP/IP,
- OSI (a theoretical model).

Anyone who begins their education in the field of computer networks must learn the OSI and TCP/IP models and the packets of the TCP/IP protocol. Both models are based on layers. They are an architectural principle dividing that a task into smaller stages. At each stage a specified part of the task is completed, interacting only with the neighbouring layers. This enables to develop cooperative network solutions by diffferent producers for various operating systems.me5106087c6291f20_1527752263647_0Anyone who begins their education in the field of computer networks must learn the OSI and TCP/IP models and the packets of the TCP/IP protocol. Both models are based on layers. They are an architectural principle dividing that a task into smaller stages. At each stage a specified part of the task is completed, interacting only with the neighbouring layers. This enables to develop cooperative network solutions by diffferent producers for various operating systems.

[Illustration 1]

A simplified layerlayerlayer model is divided into three sections:

- media,
- transport,
- applications.

Task 1

In a text file describe briefly the functionality of the following basic protocols of the application layer: HTTP, Telnet, FTP, SSH, POP3, SMTP and DNS.me5106087c6291f20_1527752256679_0In a text file describe briefly the functionality of the following basic protocols of the application layer: HTTP, Telnet, FTP, SSH, POP3, SMTP and DNS.

A modemmodemmodem is a network device that modulates a signalsignalsignal in order to encode digital information so that it can be transmitted in a selected transmission medium and demodulates the signalsignalsignal in a receiving device to decode the transmitted data. It is used in point‑to‑point connections. We use modems at home, at school and at work. The modemmodemmodem is the first device your computer, laptop, tablet or telephone connects to when you want to access the Internet.

The types of modems:

- telephone modems,
- xDSL telephone modems,
- cable modems,
- radio modems.

Lesson summaryme5106087c6291f20_1528450119332_0Lesson summary

Computers and devices connected into a network must communicate with one another. To make it possible, it is necessary that they speak the same language. Communication (network) protocols play the role of the languages of computer communication.

Selected words and expressions used in the lesson plan

coaxial cablecoaxial cablecoaxial cable

data transmissiondata transmissiondata transmission

foiled twisted pair cablefoiled twisted pair cablefoiled twisted pair cable

layerlayerlayer

modemmodemmodem

network protocolnetwork protocolnetwork protocol

optical fibre cableoptical fibre cableoptical fibre cable

radio wavesradio wavesradio waves

signalsignalsignal

unshielded twisted pair cableunshielded twisted pair cableunshielded twisted pair cable