Presentation "local computer network". Presentation "local computer network" Local computer networks presentation

A computer network is a connection of computers to exchange information and share resources (printer, modem, disk memory, etc.).

A computer network is a connection of computers to exchange information and share resources (printer, modem, disk memory, etc.).

The local network

A local network unites computers installed in one room (classroom, office, etc.), in one building or in several nearby buildings.
Usually computers local network located at a distance of no more than one kilometer. As the distance increases, special equipment is used.

The local network

Based on the way computers interact, local networks are divided into:
peer-to-peer;
networks with a dedicated server.

Peer-to-peer local network

In a peer-to-peer local network, all computers have equal rights. Shared devices can be connected to any computer on the network.

Dedicated server network

Network structure with dedicated server

Dedicated server network

Server (from the English server - service device) is a computer that distributes resources between network users.

Installed on the server powerful processor, large RAM and disk memory, the main part is stored software and network data that can be used by all network users.

Dedicated server network

Less powerful computers with less disk and RAM memory are usually used as workstations.

In networks with a dedicated server, client-server technology is implemented.
Server software is installed on the server:
server room operating system;
WEB server (Intranet organization);
proxy server (ensuring work with Internet workstations);
file server (providing file sharing), etc.

On workstation
client software is installed:
operating system for workstations;
client part of application software, etc.

Dedicated server network software

The most common methods for connecting computers are:
bus (usually used for peer-to-peer networks);
star (used for any local networks).

Hardware networks

Connection type - “bus”

The cable runs from one computer to another, connecting computers and peripherals

Connection type - "star"

Each computer is connected to a separate cable from one central node.

LAN Components

To organize a local network, you need to install a network card in each PC and connect all computers using a special cable.

LAN Components

Sometimes the components necessary for connecting computers are already installed on system board and then a separate network card is not needed.

In this case, the socket for network cable located on the rear wall of the system unit.

Cables

LAN Components

Coaxial cable– transmission speed up to 10 Mbit/s.

Twisted pair - transmission speed up to 100 Mbit/s.

LAN Components

Cable connectors

for coaxial cable

for twisted pair

LAN Components

Hubs (HUB or Switch) - used to connect computers on a network.
A hub can have a varying number of connection ports (usually from 8 to 32).

LAN Components

The overall network connection speed when using the HUB is determined by the speed of the slowest network card.
For Switch, the connection speed of any pair of computers is determined by the speed of the slowest network card in the pair (group).

Network software

To work on a local network, you need special network software.
On Windows operating system
you already have everything you need to install the network.

Network software

To organize a local network you need:
determine the name of the Working Group;
assign each computer a unique one in a given Working group name and IP address, and set the subnet mask address (in some cases, an explicit IP address and subnet mask address may not be set).

Network software

This window
used for installation
computer name
and the Working Group

Network software

These windows are used to install
explicit IP address and subnet mask settings

This window
used for installation
access level
To local resources computer

Local resource. Network users are prohibited from accessing computer resources. To ensure the availability of local resources, you need to set the switch to Shared resource.

Shared resource. Allows the use of computer resources (disk memory and peripheral devices - printer, modem) to network users. To do this, you need to allow Opening public access to the folder. In this case, it is necessary to determine the access level.

Modes of access to network resources

Modes of access to network resources

Only reading
Allows network users to open or copy files and folders.
Full access
Allows network users to perform all operations on files and folders (move, delete, edit, rename, etc.).
Password access
This mode gives different categories of users different access rights, for example, read-only or full access.

LOCAL

COMPUTER

NETWORKS

Local networks (from English local - local) are networks consisting of closely located computers, most often located in the same room, in the same building or in closely located buildings.

The most important characteristic local networks is:

speed data transmission, That's why
data transfer rate, That's why PCs are connected using high-speed adapters

(baud rate = 10 Mbps)

high-speed digital lines communications

local networks must be easily adaptable and flexible

When connecting directly to PC

There are 2 types of interaction:

REMOTE CONTROL

DIRECT ACCESS

Direct access:

All actions on the Direct connection command are carried out Master direct connection using successive Direct Connection dialog boxes.

Preparatory operations:

installation software components Client, Protocol, Services;

installing the Microsoft network file and printer access service;

providing access at the resource level;

The windows indicate which computer is the slave and which is the master; port used for communication; the login password used.

definition as shared resources of the PC server participating in the exchange;

connection from a client computer to shared information resources.

Remote control:

Main synchronization system incl. into yourself:

1) combining desktop and laptop computers. The desktop computer must be the master computer, and the folders containing the necessary files must be shared;

2) copying files from a desktop computer to a portable one in the Portfolio folder;

3) disconnecting the laptop computer from the desktop one and further editing files in the Portfolio folder;

4) reconnecting the laptop to the desktop computer, from which the source files were originally copied to the Portfolio folder;

5) opening the Briefcase folder and executing the Briefcase/Update command.

For files modified on a desktop PC, a warning will be issued, after which you must select any of the following actions:

update on laptop;

update on desktop PC;

canceling any update.

TYPOLOGY NETWORKS

"TIRE"

"STAR"

« RING »

"SNOWFLAKE"

Soy d indignation type " star ".

Advantages:

With a star connection, it is easy to look for a fault in the network.

Flaws:

the connection is not always reliable, since the failure of the central node can lead to a network stop.

Soy d indignation " common bus ".

Advantages:

In a “common bus” topology, the failure of individual computers does not bring the entire network to a standstill.

Flaws:

It is somewhat more difficult to find a fault in the cable and if the cable (the same for the entire network) breaks, the operation of the entire network is disrupted.

Soy d indignation type " ring ".

Advantages:

load balancing, possibility and convenience of cable installation.

Flaws:

physical restrictions on the total length of the network.

Soy d indignation " snowflake ".

If the enterprise occupies a multi-storey building, then the scheme can be applied to it " snowflake " , which has file servers for different workgroups and one central server for the entire enterprise.

The presentation on the topic "Local Computer Network" is intended for use when studying computer disciplines by 1st and 2nd year students. The presentation includes the concept of a local computer network, classification, description of the hardware and software of a local computer network, and network access modes.

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Local computer network

A computer network is a connection of computers to exchange information and share resources (printer, modem, disk memory, etc.).

A local network unites computers installed in one room (classroom, office, etc.), in one building or in several nearby buildings. Typically, local network computers are located at a distance of no more than one kilometer. As the distance increases, special equipment is used.

Based on the way computers interact, local networks are divided into: peer-to-peer; networks with a dedicated server. The local network

Peer-to-peer local network In a peer-to-peer local network, all computers have equal rights. Shared devices can be connected to any computer on the network.

Network with a dedicated server Network structure with a dedicated server

Server (from the English server - service device) is a computer that distributes resources between network users. The server has a powerful processor, large RAM and disk memory, and stores the bulk of software and network data that can be used by all network users.

Less powerful computers with less disk and RAM memory are usually used as workstations.

In networks with a dedicated server, client-server technology is implemented. Server software is installed on the server: server operating system; WEB server (Intranet organization); proxy server (ensuring work with Internet workstations); file server (providing file sharing), etc. Dedicated server network software

Client software is installed on the workstation: operating system for workstations; client part of application software, etc. Dedicated server network software

The most common ways to connect computers are: bus (usually used for peer-to-peer networks); star (used for any local networks). Network hardware

Components of a local network To organize a local network, you need to install a network card in each PC and connect all computers using a special cable.

Sometimes the components necessary for connecting computers are already installed on the motherboard and then a separate network card is not needed. In this case, the socket for the network cable is located on the rear wall of the system unit.

Local network components Coaxial cable – transmission speed up to 10 Mbit/s. Twisted pair - transmission speed up to 100 Mbit/s.

Components of a local network Hubs (HUB or Switch) - used to connect computers on a network. A hub can have a varying number of connection ports (usually from 8 to 32).

LAN Components The overall network connection speed when using a HUB is determined by the speed of the slowest network card. For Switch, the connection speed of any pair of computers is determined by the speed of the slowest network card in the pair (group).

Network software To organize a local network you need to: determine the name of the Working Group; assign each computer a unique name and IP address in this Workgroup, and also set a subnet mask address (in some cases, an explicit IP address and subnet mask address may not be set).

Network Software This window is used to set the computer name and Workgroup

Network Software These windows are used to set explicit IP address and subnet mask parameters

This window is used to set the level of access to local computer resources. Modes of access to network resources.

Local resource. Network users are prohibited from accessing computer resources. To ensure the availability of local resources, you need to set the switch to the Shared resource position. Shared resource. Allows the use of computer resources (disk memory and peripheral devices - printer, modem) to network users. To do this, you need to allow Sharing the folder. In this case, it is necessary to determine the access level. Modes of access to network resources

Network resource access modes Read only Allows network users to open or copy files and folders. Full access Allows network users to perform all operations on files and folders (move, delete, edit, rename, etc.). Password Access This mode gives different categories of users different access rights, such as read-only or full access.

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Computer network – a system of interconnected computers designed to transmit, store and process information.

Connecting computers located on a short distance from each other are called local network . Users have shared access to computer resources and can also share peripheral devices.

A local network in which all users have equal rights is called peer-to-peer .

If there are 10 or more computers on the network, then to increase productivity, some computers are specially allocated to store a certain part of the information. Such computers are called servers , and the local network is server based network . Other computers are called workstations or network clients .

??? What local network

in office number 41?

network topology .

The simplest option for connecting computers, when a cable connects all computers and peripheral devices in series, is called linear bus .

The connection diagram of computers on a local network is called network topology .

If each computer is connected to a separate cable from one central node (hub), this connection option is called star .

The connection diagram of computers on a local network is called network topology .

When a very large number of computers are connected to the network (more than 100), for greater performance the servers are connected in ring using fiber optic cable. The ring cable is connected to a high-performance hub. Switches of other network segments are also connected to it.

??? What is the topology in the office? № 41?

subscriber name

delimiter

server name

Computer network services

Teleconference – exchange of information on a specific topic between users. Teleconferencing allows you to distribute your message simultaneously to a large number of network users. Each conference is dedicated to a specific topic.

Example conference address: fido7.multimedia

Working with files on file archive servers (browsing directories and files, copying, deleting and updating files). It is used, as a rule, for exchanging programs (supported by the ftp and http protocols).

Computer network services

IRC (Internet Relay Chat) – interactive communication in real time: exchange of messages typed from the keyboard between several users, exchange audio messages, video exchange.

ICQ ( internet pager) – two-way exchange of text information in real time.

Internet telephony – the ability to create voicemail, as well as exchange video images, text messages, files.

Internet radio – a service that allows you to listen to radio stations broadcasting on the network.

Internet television – a service that allows you to receive television channels.

Online stores – a service that allows you to make purchases without leaving your home. Payment is made either in cash or through virtual banks.

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