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Network ConceptsNetwork ConceptsDevicesDevices

Introduction into Network Introduction into Network DevicesDevices

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AimsAims Gain a knowledge about network devices.Gain a knowledge about network devices.

Discuss what network devices are Discuss what network devices are required to create a basic networkrequired to create a basic network

Draw a bespoke network drawing using Draw a bespoke network drawing using VisioVisio

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Network DevicesNetwork Devices

In order to setup a network a variety of devices In order to setup a network a variety of devices are required.are required.

The network devices differ according to what The network devices differ according to what network you intend to setup.network you intend to setup.

A network segment is a portion of a computer A network segment is a portion of a computer network where every device communicates network where every device communicates using the same physical layer.using the same physical layer.

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Basic NetworkBasic Network

A simple network can be created between two A simple network can be created between two computers (peer to peer).computers (peer to peer). In order to create this connection each computer must In order to create this connection each computer must

have an NIC network interface card.have an NIC network interface card.

A Network card, Network Adapter, LAN Adapter or A Network card, Network Adapter, LAN Adapter or NIC (network interface card) is a piece of computer NIC (network interface card) is a piece of computer hardware designed to allow computers to hardware designed to allow computers to communicate over a computer network.communicate over a computer network.

WorkstationsWorkstations

File ServersFile Servers

Network Interface CardsNetwork Interface Cards

Basic NetworkBasic Network

An NIC provides physical access to a An NIC provides physical access to a networking medium and provides a low-networking medium and provides a low-level addressing system through the use level addressing system through the use of MAC (Media Access Control) of MAC (Media Access Control) addresses. addresses.

It allows users to connect to each other It allows users to connect to each other either by using cables or wirelessly.either by using cables or wirelessly.

ModemsModems

Wireless Access PointWireless Access Point

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Other Network DevicesOther Network Devices

There are a variety of different network There are a variety of different network devices that are available, each of which devices that are available, each of which has a specific role within the network.has a specific role within the network.

Some of which are listed below:Some of which are listed below: SwitchSwitch HubHub RouterRouter BridgeBridge GatewayGateway RepeatersRepeaters

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Other Network DevicesOther Network Devices

SwitchesSwitches A networkA network switch is a device that connects network switch is a device that connects network

segments.segments.

A switch is intelligent, it can recognise what cable has A switch is intelligent, it can recognise what cable has been inserted into it and adapt to allow the network to been inserted into it and adapt to allow the network to communicate.communicate.

SwitchesSwitches

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Other Network DevicesOther Network Devices

HubsHubs A A network hubnetwork hub is a device for connecting is a device for connecting

multiple devices together, making them act as multiple devices together, making them act as a single network segment.a single network segment.

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Other Network DevicesOther Network Devices

What is the difference between a Hub and What is the difference between a Hub and a Switch?a Switch? A hub receives a packet at one of its ports from A hub receives a packet at one of its ports from

a PC on the network, it transmits the packet to a PC on the network, it transmits the packet to all of its ports (broadcast) thus, to all of the all of its ports (broadcast) thus, to all of the other PCs on the network.other PCs on the network.

A hub does not use any intelligence to A hub does not use any intelligence to determine the destination of a packet, whereas determine the destination of a packet, whereas a switch does.a switch does.

RoutersRouters

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Other Network DevicesOther Network Devices

RouterRouter This is a device that forwards and routes data This is a device that forwards and routes data

packets along networks.packets along networks.

A router is often included as part of a network A router is often included as part of a network switch.switch.

A router is located where one network meets A router is located where one network meets another.another.

It prevents the traffic on one from unnecessarily It prevents the traffic on one from unnecessarily spilling over to the other. This process is known spilling over to the other. This process is known as routing. as routing.

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Other NetworksOther Networks

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Other Network DevicesOther Network Devices

BridgeBridge A A bridge bridge is a device that connects two is a device that connects two

networks so that they act as if they’re one networks so that they act as if they’re one network.network.

A key feature of a bridge is to enable a large A key feature of a bridge is to enable a large network to be partition into two smaller, more network to be partition into two smaller, more efficient networks.efficient networks.

Bridges work best in networks that are highly Bridges work best in networks that are highly segregated.segregated.

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Other Network DevicesOther Network Devices

GatewayGateway The main job of a gateway is to convert protocols The main job of a gateway is to convert protocols

among communications networks.among communications networks.

A gateway can accept a packet formatted for one A gateway can accept a packet formatted for one protocol (e.g. AppleTalk) and convert it to a packet protocol (e.g. AppleTalk) and convert it to a packet formatted for another protocol (e.g. TCP/IP) before formatted for another protocol (e.g. TCP/IP) before forwarding it.forwarding it.

A gateway can be implemented in hardware, software A gateway can be implemented in hardware, software or both, but they are usually implemented by software or both, but they are usually implemented by software installed within a router. installed within a router.

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ConclusionConclusion

Gained knowledge about network devicesGained knowledge about network devices

Discuss what network devices are Discuss what network devices are required to setup a networkrequired to setup a network

Create a bespoke network diagram in Create a bespoke network diagram in VisioVisio